diff options
Diffstat (limited to 'railties/doc/guides/html/creating_plugins.html')
-rw-r--r-- | railties/doc/guides/html/creating_plugins.html | 1148 |
1 files changed, 733 insertions, 415 deletions
diff --git a/railties/doc/guides/html/creating_plugins.html b/railties/doc/guides/html/creating_plugins.html index 375d216b4a..850822c8ed 100644 --- a/railties/doc/guides/html/creating_plugins.html +++ b/railties/doc/guides/html/creating_plugins.html @@ -199,14 +199,22 @@ ul#navMain { <h2>Chapters</h2> <ol> <li> - <a href="#_preparation">Preparation</a> + <a href="#_setup">Setup</a> <ul> <li><a href="#_create_the_basic_app">Create the basic app</a></li> <li><a href="#_generate_the_plugin_skeleton">Generate the plugin skeleton</a></li> - <li><a href="#_setup_the_plugin_for_testing">Setup the plugin for testing</a></li> + <li><a href="#_organize_your_files">Organize your files</a></li> + + </ul> + </li> + <li> + <a href="#_tests">Tests</a> + <ul> + + <li><a href="#_test_setup">Test Setup</a></li> <li><a href="#_run_the_plugin_tests">Run the plugin tests</a></li> @@ -216,16 +224,12 @@ ul#navMain { <a href="#_extending_core_classes">Extending core classes</a> <ul> - <li><a href="#_creating_the_test">Creating the test</a></li> - - <li><a href="#_organize_your_files">Organize your files</a></li> - <li><a href="#_working_with_init_rb">Working with init.rb</a></li> </ul> </li> <li> - <a href="#_add_an_tt_acts_as_yaffle_tt_method_to_active_record">Add an <tt>acts_as_yaffle</tt> method to Active Record</a> + <a href="#_add_an_em_acts_as_em_method_to_active_record">Add an <em>acts_as</em> method to Active Record</a> <ul> <li><a href="#_add_a_class_method">Add a class method</a></li> @@ -235,56 +239,59 @@ ul#navMain { </ul> </li> <li> - <a href="#_create_a_generator">Create a generator</a> - <ul> - - <li><a href="#_testing_generators">Testing generators</a></li> - - <li><a href="#_adding_to_the_manifest">Adding to the manifest</a></li> - - <li><a href="#_manually_test_the_generator">Manually test the generator</a></li> - - <li><a href="#_the_usage_file">The USAGE file</a></li> - - </ul> + <a href="#_models">Models</a> </li> <li> - <a href="#_add_a_custom_generator_command">Add a custom generator command</a> + <a href="#_controllers">Controllers</a> </li> <li> - <a href="#_add_a_model">Add a model</a> + <a href="#_helpers">Helpers</a> </li> <li> - <a href="#_add_a_controller">Add a controller</a> + <a href="#_routes">Routes</a> </li> <li> - <a href="#_add_a_helper">Add a helper</a> + <a href="#_generators">Generators</a> + <ul> + + <li><a href="#_testing_generators">Testing generators</a></li> + + <li><a href="#_the_usage_file">The USAGE file</a></li> + + </ul> </li> <li> - <a href="#_add_a_custom_route">Add a Custom Route</a> + <a href="#_generator_commands">Generator Commands</a> </li> <li> - <a href="#_odds_and_ends">Odds and ends</a> + <a href="#_migrations">Migrations</a> <ul> - <li><a href="#_generate_rdoc_documentation">Generate RDoc Documentation</a></li> - - <li><a href="#_write_custom_rake_tasks_in_your_plugin">Write custom Rake tasks in your plugin</a></li> - - <li><a href="#_store_plugins_in_alternate_locations">Store plugins in alternate locations</a></li> + <li><a href="#_create_a_custom_rake_task">Create a custom rake task</a></li> - <li><a href="#_create_your_own_plugin_loaders_and_plugin_locators">Create your own Plugin Loaders and Plugin Locators</a></li> + <li><a href="#_call_migrations_directly">Call migrations directly</a></li> - <li><a href="#_use_custom_plugin_generators">Use Custom Plugin Generators</a></li> + <li><a href="#_generate_migrations">Generate migrations</a></li> </ul> </li> <li> + <a href="#_rake_tasks">Rake tasks</a> + </li> + <li> + <a href="#_plugingems">PluginGems</a> + </li> + <li> + <a href="#_rdoc_documentation">RDoc Documentation</a> + </li> + <li> <a href="#_appendix">Appendix</a> <ul> <li><a href="#_references">References</a></li> + <li><a href="#_contents_of_em_lib_yaffle_rb_em">Contents of <em>lib/yaffle.rb</em></a></li> + <li><a href="#_final_plugin_directory_structure">Final plugin directory structure</a></li> </ul> @@ -388,7 +395,7 @@ A custom route method that can be used in routes.rb <div class="para"><p>For the purpose of this guide pretend for a moment that you are an avid bird watcher. Your favorite bird is the Yaffle, and you want to create a plugin that allows other developers to share in the Yaffle goodness. First, you need to get setup for development.</p></div>
</div>
</div>
-<h2 id="_preparation">1. Preparation</h2>
+<h2 id="_setup">1. Setup</h2>
<div class="sectionbody">
<h3 id="_create_the_basic_app">1.1. Create the basic app</h3>
<div class="para"><p>The examples in this guide require that you have a working rails application. To create a simple rails app execute:</p></div>
@@ -447,10 +454,30 @@ create vendor/plugins/yaffle/generators/yaffle/templates create vendor/plugins/yaffle/generators/yaffle/yaffle_generator.rb
create vendor/plugins/yaffle/generators/yaffle/USAGE</tt></pre>
</div></div>
-<div class="para"><p>To begin just change one thing - move <em>init.rb</em> to <em>rails/init.rb</em>.</p></div>
-<h3 id="_setup_the_plugin_for_testing">1.3. Setup the plugin for testing</h3>
-<div class="para"><p>If your plugin interacts with a database, you'll need to setup a database connection. In this guide you will learn how to test your plugin against multiple different database adapters using Active Record. This guide will not cover how to use fixtures in plugin tests.</p></div>
-<div class="para"><p>To setup your plugin to allow for easy testing you'll need to add 3 files:</p></div>
+<h3 id="_organize_your_files">1.3. Organize your files</h3>
+<div class="para"><p>To make it easy to organize your files and to make the plugin more compatible with GemPlugins, start out by altering your file system to look like this:</p></div>
+<div class="listingblock">
+<div class="content">
+<pre><tt>|-- lib
+| |-- yaffle
+| `-- yaffle.rb
+`-- rails
+ |
+ `-- init.rb</tt></pre>
+</div></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/rails/init.rb</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'yaffle'</span>
+</tt></pre></div></div>
+<div class="para"><p>Now you can add any <em>require</em> statements to <em>lib/yaffle.rb</em> and keep <em>init.rb</em> clean.</p></div>
+</div>
+<h2 id="_tests">2. Tests</h2>
+<div class="sectionbody">
+<div class="para"><p>In this guide you will learn how to test your plugin against multiple different database adapters using Active Record. To setup your plugin to allow for easy testing you'll need to add 3 files:</p></div>
<div class="ilist"><ul>
<li>
<p>
@@ -468,6 +495,7 @@ A test helper method that sets up the database </p>
</li>
</ul></div>
+<h3 id="_test_setup">2.1. Test Setup</h3>
<div class="para"><p><strong>vendor/plugins/yaffle/test/database.yml:</strong></p></div>
<div class="listingblock">
<div class="content">
@@ -558,7 +586,7 @@ ENV<span style="color: #990000">[</span><span style="color: #FF0000">'RAILS_ROOT <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
</tt></pre></div></div>
<div class="para"><p>Now whenever you write a test that requires the database, you can call <em>load_schema</em>.</p></div>
-<h3 id="_run_the_plugin_tests">1.4. Run the plugin tests</h3>
+<h3 id="_run_the_plugin_tests">2.2. Run the plugin tests</h3>
<div class="para"><p>Once you have these files in place, you can write your first test to ensure that your plugin-testing setup is correct. By default rails generates a file in <em>vendor/plugins/yaffle/test/yaffle_test.rb</em> with a sample test. Replace the contents of that file with:</p></div>
<div class="para"><p><strong>vendor/plugins/yaffle/test/yaffle_test.rb:</strong></p></div>
<div class="listingblock">
@@ -619,22 +647,9 @@ rake DB=postgresql</tt></pre> </div></div>
<div class="para"><p>Now you are ready to test-drive your plugin!</p></div>
</div>
-<h2 id="_extending_core_classes">2. Extending core classes</h2>
+<h2 id="_extending_core_classes">3. Extending core classes</h2>
<div class="sectionbody">
-<div class="para"><p>This section will explain how to add a method to String that will be available anywhere in your rails app by:</p></div>
-<div class="ilist"><ul>
-<li>
-<p>
-Writing tests for the desired behavior
-</p>
-</li>
-<li>
-<p>
-Creating and requiring the correct files
-</p>
-</li>
-</ul></div>
-<h3 id="_creating_the_test">2.1. Creating the test</h3>
+<div class="para"><p>This section will explain how to add a method to String that will be available anywhere in your rails app.</p></div>
<div class="para"><p>In this example you will add a method to String named <tt>to_squawk</tt>. To begin, create a new test file with a few assertions:</p></div>
<div class="para"><p><strong>vendor/plugins/yaffle/test/core_ext_test.rb</strong></p></div>
<div class="listingblock">
@@ -665,24 +680,6 @@ NoMethodError: undefined method `to_squawk' for "Hello World":String ./test/core_ext_test.rb:5:in `test_to_squawk_prepends_the_word_squawk'</tt></pre>
</div></div>
<div class="para"><p>Great - now you are ready to start development.</p></div>
-<h3 id="_organize_your_files">2.2. Organize your files</h3>
-<div class="para"><p>A common pattern in rails plugins is to set up the file structure like this:</p></div>
-<div class="listingblock">
-<div class="content">
-<pre><tt>|-- lib
-| |-- yaffle
-| | `-- core_ext.rb
-| `-- yaffle.rb</tt></pre>
-</div></div>
-<div class="para"><p>The first thing we need to to is to require our <em>lib/yaffle.rb</em> file from <em>rails/init.rb</em>:</p></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/rails/init.rb</strong></p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 2.9
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'yaffle'</span>
-</tt></pre></div></div>
<div class="para"><p>Then in <em>lib/yaffle.rb</em> require <em>lib/core_ext.rb</em>:</p></div>
<div class="para"><p><strong>vendor/plugins/yaffle/lib/yaffle.rb</strong></p></div>
<div class="listingblock">
@@ -712,11 +709,11 @@ http://www.gnu.org/software/src-highlite --> >> "Hello World".to_squawk
=> "squawk! Hello World"</tt></pre>
</div></div>
-<h3 id="_working_with_init_rb">2.3. Working with init.rb</h3>
-<div class="para"><p>When rails loads plugins it looks for the file named init.rb. However, when the plugin is initialized, <em>init.rb</em> is invoked via <tt>eval</tt> (not <tt>require</tt>) so it has slightly different behavior.</p></div>
+<h3 id="_working_with_init_rb">3.1. Working with init.rb</h3>
+<div class="para"><p>When rails loads plugins it looks for the file named <em>init.rb</em> or <em>rails/init.rb</em>. However, when the plugin is initialized, <em>init.rb</em> is invoked via <tt>eval</tt> (not <tt>require</tt>) so it has slightly different behavior.</p></div>
<div class="para"><p>Under certain circumstances if you reopen classes or modules in <em>init.rb</em> you may inadvertently create a new class, rather than reopening an existing class. A better alternative is to reopen the class in a different file, and require that file from <tt>init.rb</tt>, as shown above.</p></div>
<div class="para"><p>If you must reopen a class in <tt>init.rb</tt> you can use <tt>module_eval</tt> or <tt>class_eval</tt> to avoid any issues:</p></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/init.rb</strong></p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/rails/init.rb</strong></p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 2.9
by Lorenzo Bettini
@@ -729,7 +726,7 @@ http://www.gnu.org/software/src-highlite --> <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
</tt></pre></div></div>
<div class="para"><p>Another way is to explicitly define the top-level module space for all modules and classes, like <tt>::Hash</tt>:</p></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/init.rb</strong></p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/rails/init.rb</strong></p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 2.9
by Lorenzo Bettini
@@ -742,7 +739,7 @@ http://www.gnu.org/software/src-highlite --> <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
</tt></pre></div></div>
</div>
-<h2 id="_add_an_tt_acts_as_yaffle_tt_method_to_active_record">3. Add an <tt>acts_as_yaffle</tt> method to Active Record</h2>
+<h2 id="_add_an_em_acts_as_em_method_to_active_record">4. Add an <em>acts_as</em> method to Active Record</h2>
<div class="sectionbody">
<div class="para"><p>A common pattern in plugins is to add a method called <em>acts_as_something</em> to models. In this case, you want to write a method called <em>acts_as_yaffle</em> that adds a <em>squawk</em> method to your models.</p></div>
<div class="para"><p>To begin, set up your files so that you have:</p></div>
@@ -801,7 +798,7 @@ http://www.gnu.org/software/src-highlite --> <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
</tt></pre></div></div>
<div class="para"><p>With structure you can easily separate the methods that will be used for the class (like <tt>Hickwall.some_method</tt>) and the instance (like <tt>@hickwell.some_method</tt>).</p></div>
-<h3 id="_add_a_class_method">3.1. Add a class method</h3>
+<h3 id="_add_a_class_method">4.1. Add a class method</h3>
<div class="para"><p>This plugin will expect that you've added a method to your model named <em>last_squawk</em>. However, the plugin users might have already defined a method on their model named <em>last_squawk</em> that they use for something else. This plugin will allow the name to be changed by adding a class method called <em>yaffle_text_field</em>.</p></div>
<div class="para"><p>To start out, write a failing test that shows the behavior you'd like:</p></div>
<div class="para"><p><strong>vendor/plugins/yaffle/test/acts_as_yaffle_test.rb</strong></p></div>
@@ -854,7 +851,7 @@ http://www.gnu.org/software/src-highlite --> ActiveRecord<span style="color: #990000">::</span>Base<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle
</tt></pre></div></div>
-<h3 id="_add_an_instance_method">3.2. Add an instance method</h3>
+<h3 id="_add_an_instance_method">4.2. Add an instance method</h3>
<div class="para"><p>This plugin will add a method named <em>squawk</em> to any Active Record objects that call <em>acts_as_yaffle</em>. The <em>squawk</em> method will simply set the value of one of the fields in the database.</p></div>
<div class="para"><p>To start out, write a failing test that shows the behavior you'd like:</p></div>
<div class="para"><p><strong>vendor/plugins/yaffle/test/acts_as_yaffle_test.rb</strong></p></div>
@@ -936,267 +933,7 @@ ActiveRecord<span style="color: #990000">::</span>Base<span style="color: #99000 </tr></table>
</div>
</div>
-<h2 id="_create_a_generator">4. Create a generator</h2>
-<div class="sectionbody">
-<div class="para"><p>Many plugins ship with generators. When you created the plugin above, you specified the —with-generator option, so you already have the generator stubs in <em>vendor/plugins/yaffle/generators/yaffle</em>.</p></div>
-<div class="para"><p>Building generators is a complex topic unto itself and this section will cover one small aspect of generators: creating a generator that adds a time-stamped migration.</p></div>
-<div class="para"><p>To create a generator you must:</p></div>
-<div class="ilist"><ul>
-<li>
-<p>
-Add your instructions to the <em>manifest</em> method of the generator
-</p>
-</li>
-<li>
-<p>
-Add any necessary template files to the templates directory
-</p>
-</li>
-<li>
-<p>
-Test the generator manually by running various combinations of <tt>script/generate</tt> and <tt>script/destroy</tt>
-</p>
-</li>
-<li>
-<p>
-Update the USAGE file to add helpful documentation for your generator
-</p>
-</li>
-</ul></div>
-<h3 id="_testing_generators">4.1. Testing generators</h3>
-<div class="para"><p>Many rails plugin authors do not test their generators, however testing generators is quite simple. A typical generator test does the following:</p></div>
-<div class="ilist"><ul>
-<li>
-<p>
-Creates a new fake rails root directory that will serve as destination
-</p>
-</li>
-<li>
-<p>
-Runs the generator forward and backward, making whatever assertions are necessary
-</p>
-</li>
-<li>
-<p>
-Removes the fake rails root
-</p>
-</li>
-</ul></div>
-<div class="para"><p>For the generator in this section, the test could look something like this:</p></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/test/yaffle_generator_test.rb</strong></p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 2.9
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> File<span style="color: #990000">.</span>dirname<span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">__FILE__</span></span><span style="color: #990000">)</span> <span style="color: #990000">+</span> <span style="color: #FF0000">'/test_helper.rb'</span>
-<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator'</span>
-<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator/scripts/generate'</span>
-<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator/scripts/destroy'</span>
-
-<span style="font-weight: bold"><span style="color: #0000FF">class</span></span> GeneratorTest <span style="color: #990000"><</span> Test<span style="color: #990000">::</span>Unit<span style="color: #990000">::</span>TestCase
-
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> fake_rails_root
- File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>File<span style="color: #990000">.</span>dirname<span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">__FILE__</span></span><span style="color: #990000">),</span> <span style="color: #FF0000">'rails_root'</span><span style="color: #990000">)</span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> file_list
- Dir<span style="color: #990000">.</span>glob<span style="color: #990000">(</span>File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">,</span> <span style="color: #FF0000">"db"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"migrate"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"*"</span><span style="color: #990000">))</span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> setup
- FileUtils<span style="color: #990000">.</span>mkdir_p<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">)</span>
- <span style="color: #009900">@original_files</span> <span style="color: #990000">=</span> file_list
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> teardown
- FileUtils<span style="color: #990000">.</span>rm_r<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">)</span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> test_generates_correct_file_name
- Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Scripts<span style="color: #990000">::</span>Generate<span style="color: #990000">.</span>new<span style="color: #990000">.</span>run<span style="color: #990000">([</span><span style="color: #FF0000">"yaffle"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"bird"</span><span style="color: #990000">],</span> <span style="color: #990000">:</span>destination <span style="color: #990000">=></span> fake_rails_root<span style="color: #990000">)</span>
- new_file <span style="color: #990000">=</span> <span style="color: #990000">(</span>file_list <span style="color: #990000">-</span> <span style="color: #009900">@original_files</span><span style="color: #990000">).</span>first
- assert_match <span style="color: #FF6600">/add_yaffle_fields_to_bird/</span><span style="color: #990000">,</span> new_file
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
-<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-</tt></pre></div></div>
-<div class="para"><p>You can run <em>rake</em> from the plugin directory to see this fail. Unless you are doing more advanced generator commands it typically suffices to just test the Generate script, and trust that rails will handle the Destroy and Update commands for you.</p></div>
-<h3 id="_adding_to_the_manifest">4.2. Adding to the manifest</h3>
-<div class="para"><p>This example will demonstrate how to use one of the built-in generator methods named <em>migration_template</em> to create a migration file. To start, update your generator file to look like this:</p></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/generators/yaffle/yaffle_generator.rb</strong></p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 2.9
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">class</span></span> YaffleGenerator <span style="color: #990000"><</span> Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>NamedBase
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> manifest
- record <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>m<span style="color: #990000">|</span>
- m<span style="color: #990000">.</span>migration_template <span style="color: #FF0000">'migration:migration.rb'</span><span style="color: #990000">,</span> <span style="color: #FF0000">"db/migrate"</span><span style="color: #990000">,</span> <span style="color: #FF0000">{</span><span style="color: #990000">:</span>assigns <span style="color: #990000">=></span> yaffle_local_assigns<span style="color: #990000">,</span>
- <span style="color: #990000">:</span>migration_file_name <span style="color: #990000">=></span> <span style="color: #FF0000">"add_yaffle_fields_to_#{custom_file_name}"</span>
- <span style="color: #FF0000">}</span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
- private
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> custom_file_name
- custom_name <span style="color: #990000">=</span> class_name<span style="color: #990000">.</span>underscore<span style="color: #990000">.</span>downcase
- custom_name <span style="color: #990000">=</span> custom_name<span style="color: #990000">.</span>pluralize <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> ActiveRecord<span style="color: #990000">::</span>Base<span style="color: #990000">.</span>pluralize_table_names
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> yaffle_local_assigns
- returning<span style="color: #990000">(</span>assigns <span style="color: #990000">=</span> <span style="color: #FF0000">{}</span><span style="color: #990000">)</span> <span style="font-weight: bold"><span style="color: #0000FF">do</span></span>
- assigns<span style="color: #990000">[:</span>migration_action<span style="color: #990000">]</span> <span style="color: #990000">=</span> <span style="color: #FF0000">"add"</span>
- assigns<span style="color: #990000">[:</span>class_name<span style="color: #990000">]</span> <span style="color: #990000">=</span> <span style="color: #FF0000">"add_yaffle_fields_to_#{custom_file_name}"</span>
- assigns<span style="color: #990000">[:</span>table_name<span style="color: #990000">]</span> <span style="color: #990000">=</span> custom_file_name
- assigns<span style="color: #990000">[:</span>attributes<span style="color: #990000">]</span> <span style="color: #990000">=</span> <span style="color: #990000">[</span>Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>GeneratedAttribute<span style="color: #990000">.</span>new<span style="color: #990000">(</span><span style="color: #FF0000">"last_squawk"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"string"</span><span style="color: #990000">)]</span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-</tt></pre></div></div>
-<div class="para"><p>The generator creates a new file in <em>db/migrate</em> with a timestamp and an <em>add_column</em> statement. It reuses the built in rails <tt>migration_template</tt> method, and reuses the built-in rails migration template.</p></div>
-<div class="para"><p>It's courteous to check to see if table names are being pluralized whenever you create a generator that needs to be aware of table names. This way people using your generator won't have to manually change the generated files if they've turned pluralization off.</p></div>
-<h3 id="_manually_test_the_generator">4.3. Manually test the generator</h3>
-<div class="para"><p>To run the generator, type the following at the command line:</p></div>
-<div class="listingblock">
-<div class="content">
-<pre><tt>./script/generate yaffle bird</tt></pre>
-</div></div>
-<div class="para"><p>and you will see a new file:</p></div>
-<div class="para"><p><strong>db/migrate/20080529225649_add_yaffle_fields_to_birds.rb</strong></p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 2.9
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">class</span></span> AddYaffleFieldsToBirds <span style="color: #990000"><</span> ActiveRecord<span style="color: #990000">::</span>Migration
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> <span style="font-weight: bold"><span style="color: #0000FF">self</span></span><span style="color: #990000">.</span>up
- add_column <span style="color: #990000">:</span>birds<span style="color: #990000">,</span> <span style="color: #990000">:</span>last_squawk<span style="color: #990000">,</span> <span style="color: #990000">:</span>string
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> <span style="font-weight: bold"><span style="color: #0000FF">self</span></span><span style="color: #990000">.</span>down
- remove_column <span style="color: #990000">:</span>birds<span style="color: #990000">,</span> <span style="color: #990000">:</span>last_squawk
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-</tt></pre></div></div>
-<h3 id="_the_usage_file">4.4. The USAGE file</h3>
-<div class="para"><p>Rails ships with several built-in generators. You can see all of the generators available to you by typing the following at the command line:</p></div>
-<div class="listingblock">
-<div class="content">
-<pre><tt>script/generate</tt></pre>
-</div></div>
-<div class="para"><p>You should see something like this:</p></div>
-<div class="listingblock">
-<div class="content">
-<pre><tt>Installed Generators
- Plugins (vendor/plugins): yaffle
- Builtin: controller, integration_test, mailer, migration, model, observer, plugin, resource, scaffold, session_migration</tt></pre>
-</div></div>
-<div class="para"><p>When you run <tt>script/generate yaffle</tt> you should see the contents of your <em>vendor/plugins/yaffle/generators/yaffle/USAGE</em> file.</p></div>
-<div class="para"><p>For this plugin, update the USAGE file looks like this:</p></div>
-<div class="listingblock">
-<div class="content">
-<pre><tt>Description:
- Creates a migration that adds yaffle squawk fields to the given model
-
-Example:
- ./script/generate yaffle hickwall
-
- This will create:
- db/migrate/TIMESTAMP_add_yaffle_fields_to_hickwall</tt></pre>
-</div></div>
-</div>
-<h2 id="_add_a_custom_generator_command">5. Add a custom generator command</h2>
-<div class="sectionbody">
-<div class="para"><p>You may have noticed above that you can used one of the built-in rails migration commands <tt>migration_template</tt>. If your plugin needs to add and remove lines of text from existing files you will need to write your own generator methods.</p></div>
-<div class="para"><p>This section describes how you you can create your own commands to add and remove a line of text from <em>routes.rb</em>. This example creates a very simple method that adds or removes a text file.</p></div>
-<div class="para"><p>To start, add the following test method:</p></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/test/generator_test.rb</strong></p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 2.9
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">def</span></span> test_generates_definition
- Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Scripts<span style="color: #990000">::</span>Generate<span style="color: #990000">.</span>new<span style="color: #990000">.</span>run<span style="color: #990000">([</span><span style="color: #FF0000">"yaffle"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"bird"</span><span style="color: #990000">],</span> <span style="color: #990000">:</span>destination <span style="color: #990000">=></span> fake_rails_root<span style="color: #990000">)</span>
- definition <span style="color: #990000">=</span> File<span style="color: #990000">.</span>read<span style="color: #990000">(</span>File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">,</span> <span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">))</span>
- assert_match <span style="color: #FF6600">/Yaffle\:/</span><span style="color: #990000">,</span> definition
-<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-</tt></pre></div></div>
-<div class="para"><p>Run <tt>rake</tt> to watch the test fail, then make the test pass add the following:</p></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/generators/yaffle/templates/definition.txt</strong></p></div>
-<div class="listingblock">
-<div class="content">
-<pre><tt>Yaffle: A bird</tt></pre>
-</div></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/lib/yaffle.rb</strong></p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 2.9
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">"yaffle/commands"</span>
-</tt></pre></div></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/lib/commands.rb</strong></p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 2.9
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator'</span>
-<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator/commands'</span>
-
-<span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Yaffle <span style="font-style: italic"><span style="color: #9A1900">#:nodoc:</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Generator <span style="font-style: italic"><span style="color: #9A1900">#:nodoc:</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Commands <span style="font-style: italic"><span style="color: #9A1900">#:nodoc:</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Create
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> yaffle_definition
- file<span style="color: #990000">(</span><span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">)</span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
- <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Destroy
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> yaffle_definition
- file<span style="color: #990000">(</span><span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">)</span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
- <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> List
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> yaffle_definition
- file<span style="color: #990000">(</span><span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">)</span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
- <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Update
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> yaffle_definition
- file<span style="color: #990000">(</span><span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">)</span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
-Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Create<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Create
-Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Destroy<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Destroy
-Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>List<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>List
-Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Update<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Update
-</tt></pre></div></div>
-<div class="para"><p>Finally, call your new method in the manifest:</p></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/generators/yaffle/yaffle_generator.rb</strong></p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 2.9
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">class</span></span> YaffleGenerator <span style="color: #990000"><</span> Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>NamedBase
- <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> manifest
- m<span style="color: #990000">.</span>yaffle_definition
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-</tt></pre></div></div>
-</div>
-<h2 id="_add_a_model">6. Add a model</h2>
+<h2 id="_models">5. Models</h2>
<div class="sectionbody">
<div class="para"><p>This section describes how to add a model named <em>Woodpecker</em> to your plugin that will behave the same as a model in your main app. When storing models, controllers, views and helpers in your plugin, it's customary to keep them in directories that match the rails directories. For this example, create a file structure like this:</p></div>
<div class="listingblock">
@@ -1263,19 +1000,17 @@ http://www.gnu.org/software/src-highlite --> by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>ActiveRecord<span style="color: #990000">::</span>Schema<span style="color: #990000">.</span>define<span style="color: #990000">(:</span>version <span style="color: #990000">=></span> <span style="color: #993399">0</span><span style="color: #990000">)</span> <span style="font-weight: bold"><span style="color: #0000FF">do</span></span>
- create_table <span style="color: #990000">:</span>woodpeckers<span style="color: #990000">,</span> <span style="color: #990000">:</span>force <span style="color: #990000">=></span> <span style="font-weight: bold"><span style="color: #0000FF">true</span></span> <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>t<span style="color: #990000">|</span>
- t<span style="color: #990000">.</span>string <span style="color: #990000">:</span>name
- <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+<pre><tt>create_table <span style="color: #990000">:</span>woodpeckers<span style="color: #990000">,</span> <span style="color: #990000">:</span>force <span style="color: #990000">=></span> <span style="font-weight: bold"><span style="color: #0000FF">true</span></span> <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>t<span style="color: #990000">|</span>
+ t<span style="color: #990000">.</span>string <span style="color: #990000">:</span>name
<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
</tt></pre></div></div>
<div class="para"><p>Now your test should be passing, and you should be able to use the Woodpecker model from within your rails app, and any changes made to it are reflected immediately when running in development mode.</p></div>
</div>
-<h2 id="_add_a_controller">7. Add a controller</h2>
+<h2 id="_controllers">6. Controllers</h2>
<div class="sectionbody">
<div class="para"><p>This section describes how to add a controller named <em>woodpeckers</em> to your plugin that will behave the same as a controller in your main app. This is very similar to adding a model.</p></div>
<div class="para"><p>You can test your plugin's controller as you would test any other controller:</p></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/yaffle/woodpeckers_controller_test.rb:</strong></p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/test/woodpeckers_controller_test.rb:</strong></p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 2.9
by Lorenzo Bettini
@@ -1292,6 +1027,10 @@ http://www.gnu.org/software/src-highlite --> <span style="color: #009900">@controller</span> <span style="color: #990000">=</span> WoodpeckersController<span style="color: #990000">.</span>new
<span style="color: #009900">@request</span> <span style="color: #990000">=</span> ActionController<span style="color: #990000">::</span>TestRequest<span style="color: #990000">.</span>new
<span style="color: #009900">@response</span> <span style="color: #990000">=</span> ActionController<span style="color: #990000">::</span>TestResponse<span style="color: #990000">.</span>new
+
+ ActionController<span style="color: #990000">::</span>Routing<span style="color: #990000">::</span>Routes<span style="color: #990000">.</span>draw <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>map<span style="color: #990000">|</span>
+ map<span style="color: #990000">.</span>resources <span style="color: #990000">:</span>woodpeckers
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
<span style="font-weight: bold"><span style="color: #0000FF">def</span></span> test_index
@@ -1330,7 +1069,7 @@ http://www.gnu.org/software/src-highlite --> </tt></pre></div></div>
<div class="para"><p>Now your test should be passing, and you should be able to use the Woodpeckers controller in your app. If you add a route for the woodpeckers controller you can start up your server and go to <a href="http://localhost:3000/woodpeckers">http://localhost:3000/woodpeckers</a> to see your controller in action.</p></div>
</div>
-<h2 id="_add_a_helper">8. Add a helper</h2>
+<h2 id="_helpers">7. Helpers</h2>
<div class="sectionbody">
<div class="para"><p>This section describes how to add a helper named <em>WoodpeckersHelper</em> to your plugin that will behave the same as a helper in your main app. This is very similar to adding a model and a controller.</p></div>
<div class="para"><p>You can test your plugin's helper as you would test any other helper:</p></div>
@@ -1362,8 +1101,6 @@ http://www.gnu.org/software/src-highlite --> ActiveSupport<span style="color: #990000">::</span>Dependencies<span style="color: #990000">.</span>load_paths <span style="color: #990000"><<</span> path
ActiveSupport<span style="color: #990000">::</span>Dependencies<span style="color: #990000">.</span>load_once_paths<span style="color: #990000">.</span>delete<span style="color: #990000">(</span>path<span style="color: #990000">)</span>
<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
-
-ActionView<span style="color: #990000">::</span>Base<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> WoodpeckersHelper
</tt></pre></div></div>
<div class="para"><p><strong>vendor/plugins/yaffle/lib/app/helpers/woodpeckers_helper.rb:</strong></p></div>
<div class="listingblock">
@@ -1381,9 +1118,10 @@ http://www.gnu.org/software/src-highlite --> </tt></pre></div></div>
<div class="para"><p>Now your test should be passing, and you should be able to use the Woodpeckers helper in your app.</p></div>
</div>
-<h2 id="_add_a_custom_route">9. Add a Custom Route</h2>
+<h2 id="_routes">8. Routes</h2>
<div class="sectionbody">
-<div class="para"><p>Testing routes in plugins can be complex, especially if the controllers are also in the plugin itself. Jamis Buck showed a great example of this in <a href="http://weblog.jamisbuck.org/2006/10/26/monkey-patching-rails-extending-routes-2">http://weblog.jamisbuck.org/2006/10/26/monkey-patching-rails-extending-routes-2</a>.</p></div>
+<div class="para"><p>In a standard <em>routes.rb</em> file you use routes like <em>map.connect</em> or <em>map.resources</em>. You can add your own custom routes from a plugin. This section will describe how to add a custom method called that can be called with <em>map.yaffles</em>.</p></div>
+<div class="para"><p>Testing routes from plugins is slightly different from testing routes in a standard rails app. To begin, add a test like this:</p></div>
<div class="para"><p><strong>vendor/plugins/yaffle/test/routing_test.rb</strong></p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 2.9
@@ -1406,26 +1144,22 @@ http://www.gnu.org/software/src-highlite --> private
- <span style="font-style: italic"><span style="color: #9A1900"># yes, I know about assert_recognizes, but it has proven problematic to</span></span>
- <span style="font-style: italic"><span style="color: #9A1900"># use in these tests, since it uses RouteSet#recognize (which actually</span></span>
- <span style="font-style: italic"><span style="color: #9A1900"># tries to instantiate the controller) and because it uses an awkward</span></span>
- <span style="font-style: italic"><span style="color: #9A1900"># parameter order.</span></span>
<span style="font-weight: bold"><span style="color: #0000FF">def</span></span> assert_recognition<span style="color: #990000">(</span>method<span style="color: #990000">,</span> path<span style="color: #990000">,</span> options<span style="color: #990000">)</span>
result <span style="color: #990000">=</span> ActionController<span style="color: #990000">::</span>Routing<span style="color: #990000">::</span>Routes<span style="color: #990000">.</span>recognize_path<span style="color: #990000">(</span>path<span style="color: #990000">,</span> <span style="color: #990000">:</span>method <span style="color: #990000">=></span> method<span style="color: #990000">)</span>
assert_equal options<span style="color: #990000">,</span> result
<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
</tt></pre></div></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/init.rb</strong></p></div>
+<div class="para"><p>Once you see the tests fail by running <em>rake</em>, you can make them pass with:</p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/lib/yaffle.rb</strong></p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 2.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">"routing"</span>
-ActionController<span style="color: #990000">::</span>Routing<span style="color: #990000">::</span>RouteSet<span style="color: #990000">::</span>Mapper<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle<span style="color: #990000">::</span>Routing<span style="color: #990000">::</span>MapperExtensions
+<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">"yaffle/routing"</span>
</tt></pre></div></div>
-<div class="para"><p><strong>vendor/plugins/yaffle/lib/routing.rb</strong></p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/lib/yaffle/routing.rb</strong></p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 2.9
by Lorenzo Bettini
@@ -1440,6 +1174,8 @@ http://www.gnu.org/software/src-highlite --> <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ActionController<span style="color: #990000">::</span>Routing<span style="color: #990000">::</span>RouteSet<span style="color: #990000">::</span>Mapper<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle<span style="color: #990000">::</span>Routing<span style="color: #990000">::</span>MapperExtensions
</tt></pre></div></div>
<div class="para"><p><strong>config/routes.rb</strong></p></div>
<div class="listingblock">
@@ -1448,47 +1184,498 @@ by Lorenzo Bettini http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>ActionController<span style="color: #990000">::</span>Routing<span style="color: #990000">::</span>Routes<span style="color: #990000">.</span>draw <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>map<span style="color: #990000">|</span>
- <span style="color: #990000">...</span>
map<span style="color: #990000">.</span>yaffles
<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
</tt></pre></div></div>
<div class="para"><p>You can also see if your routes work by running <tt>rake routes</tt> from your app directory.</p></div>
</div>
-<h2 id="_odds_and_ends">10. Odds and ends</h2>
+<h2 id="_generators">9. Generators</h2>
<div class="sectionbody">
-<h3 id="_generate_rdoc_documentation">10.1. Generate RDoc Documentation</h3>
-<div class="para"><p>Once your plugin is stable, the tests pass on all database and you are ready to deploy do everyone else a favor and document it! Luckily, writing documentation for your plugin is easy.</p></div>
-<div class="para"><p>The first step is to update the README file with detailed information about how to use your plugin. A few key things to include are:</p></div>
+<div class="para"><p>Many plugins ship with generators. When you created the plugin above, you specified the —with-generator option, so you already have the generator stubs in <em>vendor/plugins/yaffle/generators/yaffle</em>.</p></div>
+<div class="para"><p>Building generators is a complex topic unto itself and this section will cover one small aspect of generators: generating a simple text file.</p></div>
+<h3 id="_testing_generators">9.1. Testing generators</h3>
+<div class="para"><p>Many rails plugin authors do not test their generators, however testing generators is quite simple. A typical generator test does the following:</p></div>
<div class="ilist"><ul>
<li>
<p>
-Your name.
+Creates a new fake rails root directory that will serve as destination
</p>
</li>
<li>
<p>
-How to install.
+Runs the generator
</p>
</li>
<li>
<p>
-How to add the functionality to the app (several examples of common use cases).
+Asserts that the correct files were generated
</p>
</li>
<li>
<p>
-Warning, gotchas or tips that might help save users time.
+Removes the fake rails root
</p>
</li>
</ul></div>
-<div class="para"><p>Once your README is solid, go through and add rdoc comments to all of the methods that developers will use.</p></div>
-<div class="para"><p>Before you generate your documentation, be sure to go through and add nodoc comments to those modules and methods that are not important to your users.</p></div>
-<div class="para"><p>Once your comments are good to go, navigate to your plugin directory and run:</p></div>
-<div class="literalblock">
+<div class="para"><p>This section will describe how to create a simple generator that adds a file. For the generator in this section, the test could look something like this:</p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/test/definition_generator_test.rb</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> File<span style="color: #990000">.</span>dirname<span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">__FILE__</span></span><span style="color: #990000">)</span> <span style="color: #990000">+</span> <span style="color: #FF0000">'/test_helper.rb'</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator'</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator/scripts/generate'</span>
+
+<span style="font-weight: bold"><span style="color: #0000FF">class</span></span> DefinitionGeneratorTest <span style="color: #990000"><</span> Test<span style="color: #990000">::</span>Unit<span style="color: #990000">::</span>TestCase
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> setup
+ FileUtils<span style="color: #990000">.</span>mkdir_p<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">)</span>
+ <span style="color: #009900">@original_files</span> <span style="color: #990000">=</span> file_list
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> teardown
+ FileUtils<span style="color: #990000">.</span>rm_r<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> test_generates_correct_file_name
+ Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Scripts<span style="color: #990000">::</span>Generate<span style="color: #990000">.</span>new<span style="color: #990000">.</span>run<span style="color: #990000">([</span><span style="color: #FF0000">"yaffle_definition"</span><span style="color: #990000">],</span> <span style="color: #990000">:</span>destination <span style="color: #990000">=></span> fake_rails_root<span style="color: #990000">)</span>
+ new_file <span style="color: #990000">=</span> <span style="color: #990000">(</span>file_list <span style="color: #990000">-</span> <span style="color: #009900">@original_files</span><span style="color: #990000">).</span>first
+ assert_equal <span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">,</span> File<span style="color: #990000">.</span>basename<span style="color: #990000">(</span>new_file<span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ private
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> fake_rails_root
+ File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>File<span style="color: #990000">.</span>dirname<span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">__FILE__</span></span><span style="color: #990000">),</span> <span style="color: #FF0000">'rails_root'</span><span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> file_list
+ Dir<span style="color: #990000">.</span>glob<span style="color: #990000">(</span>File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">,</span> <span style="color: #FF0000">"*"</span><span style="color: #990000">))</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<div class="para"><p>You can run <em>rake</em> from the plugin directory to see this fail. Unless you are doing more advanced generator commands it typically suffices to just test the Generate script, and trust that rails will handle the Destroy and Update commands for you.</p></div>
+<div class="para"><p>To make it pass, create the generator:</p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/generators/yaffle_definition/yaffle_definition_generator.rb</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">class</span></span> YaffleDefinitionGenerator <span style="color: #990000"><</span> Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Base
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> manifest
+ record <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>m<span style="color: #990000">|</span>
+ m<span style="color: #990000">.</span>file <span style="color: #FF0000">"definition.txt"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"definition.txt"</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<h3 id="_the_usage_file">9.2. The USAGE file</h3>
+<div class="para"><p>If you plan to distribute your plugin, developers will expect at least a minimum of documentation. You can add simple documentation to the generator by updating the USAGE file.</p></div>
+<div class="para"><p>Rails ships with several built-in generators. You can see all of the generators available to you by typing the following at the command line:</p></div>
+<div class="listingblock">
<div class="content">
-<pre><tt>rake rdoc</tt></pre>
+<pre><tt>./script/generate</tt></pre>
+</div></div>
+<div class="para"><p>You should see something like this:</p></div>
+<div class="listingblock">
+<div class="content">
+<pre><tt>Installed Generators
+ Plugins (vendor/plugins): yaffle_definition
+ Builtin: controller, integration_test, mailer, migration, model, observer, plugin, resource, scaffold, session_migration</tt></pre>
</div></div>
-<h3 id="_write_custom_rake_tasks_in_your_plugin">10.2. Write custom Rake tasks in your plugin</h3>
+<div class="para"><p>When you run <tt>script/generate yaffle_definition -h</tt> you should see the contents of your <em>vendor/plugins/yaffle/generators/yaffle_definition/USAGE</em>.</p></div>
+<div class="para"><p>For this plugin, update the USAGE file could look like this:</p></div>
+<div class="listingblock">
+<div class="content">
+<pre><tt>Description:
+ Adds a file with the definition of a Yaffle to the app's main directory</tt></pre>
+</div></div>
+</div>
+<h2 id="_generator_commands">10. Generator Commands</h2>
+<div class="sectionbody">
+<div class="para"><p>You may have noticed above that you can used one of the built-in rails migration commands <tt>migration_template</tt>. If your plugin needs to add and remove lines of text from existing files you will need to write your own generator methods.</p></div>
+<div class="para"><p>This section describes how you you can create your own commands to add and remove a line of text from <em>config/routes.rb</em>.</p></div>
+<div class="para"><p>To start, add the following test method:</p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/test/route_generator_test.rb</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> File<span style="color: #990000">.</span>dirname<span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">__FILE__</span></span><span style="color: #990000">)</span> <span style="color: #990000">+</span> <span style="color: #FF0000">'/test_helper.rb'</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator'</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator/scripts/generate'</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator/scripts/destroy'</span>
+
+<span style="font-weight: bold"><span style="color: #0000FF">class</span></span> RouteGeneratorTest <span style="color: #990000"><</span> Test<span style="color: #990000">::</span>Unit<span style="color: #990000">::</span>TestCase
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> setup
+ FileUtils<span style="color: #990000">.</span>mkdir_p<span style="color: #990000">(</span>File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">,</span> <span style="color: #FF0000">"config"</span><span style="color: #990000">))</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> teardown
+ FileUtils<span style="color: #990000">.</span>rm_r<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> test_generates_route
+ content <span style="color: #990000">=</span> <span style="color: #990000"><<-</span><span style="font-weight: bold"><span style="color: #0000FF">END</span></span>
+ ActionController<span style="color: #990000">::</span>Routing<span style="color: #990000">::</span>Routes<span style="color: #990000">.</span>draw <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>map<span style="color: #990000">|</span>
+ map<span style="color: #990000">.</span>connect <span style="color: #FF0000">':controller/:action/:id'</span>
+ map<span style="color: #990000">.</span>connect <span style="color: #FF0000">':controller/:action/:id.:format'</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">END</span></span>
+ File<span style="color: #990000">.</span>open<span style="color: #990000">(</span>routes_path<span style="color: #990000">,</span> <span style="color: #FF0000">'wb'</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span><span style="color: #990000">|</span>f<span style="color: #990000">|</span> f<span style="color: #990000">.</span>write<span style="color: #990000">(</span>content<span style="color: #990000">)</span> <span style="color: #FF0000">}</span>
+
+ Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Scripts<span style="color: #990000">::</span>Generate<span style="color: #990000">.</span>new<span style="color: #990000">.</span>run<span style="color: #990000">([</span><span style="color: #FF0000">"yaffle_route"</span><span style="color: #990000">],</span> <span style="color: #990000">:</span>destination <span style="color: #990000">=></span> fake_rails_root<span style="color: #990000">)</span>
+ assert_match <span style="color: #FF6600">/map\.yaffles/</span><span style="color: #990000">,</span> File<span style="color: #990000">.</span>read<span style="color: #990000">(</span>routes_path<span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> test_destroys_route
+ content <span style="color: #990000">=</span> <span style="color: #990000"><<-</span><span style="font-weight: bold"><span style="color: #0000FF">END</span></span>
+ ActionController<span style="color: #990000">::</span>Routing<span style="color: #990000">::</span>Routes<span style="color: #990000">.</span>draw <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>map<span style="color: #990000">|</span>
+ map<span style="color: #990000">.</span>yaffles
+ map<span style="color: #990000">.</span>connect <span style="color: #FF0000">':controller/:action/:id'</span>
+ map<span style="color: #990000">.</span>connect <span style="color: #FF0000">':controller/:action/:id.:format'</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">END</span></span>
+ File<span style="color: #990000">.</span>open<span style="color: #990000">(</span>routes_path<span style="color: #990000">,</span> <span style="color: #FF0000">'wb'</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span><span style="color: #990000">|</span>f<span style="color: #990000">|</span> f<span style="color: #990000">.</span>write<span style="color: #990000">(</span>content<span style="color: #990000">)</span> <span style="color: #FF0000">}</span>
+
+ Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Scripts<span style="color: #990000">::</span>Destroy<span style="color: #990000">.</span>new<span style="color: #990000">.</span>run<span style="color: #990000">([</span><span style="color: #FF0000">"yaffle_route"</span><span style="color: #990000">],</span> <span style="color: #990000">:</span>destination <span style="color: #990000">=></span> fake_rails_root<span style="color: #990000">)</span>
+ assert_no_match <span style="color: #FF6600">/map\.yaffles/</span><span style="color: #990000">,</span> File<span style="color: #990000">.</span>read<span style="color: #990000">(</span>routes_path<span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ private
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> fake_rails_root
+ File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>File<span style="color: #990000">.</span>dirname<span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">__FILE__</span></span><span style="color: #990000">),</span> <span style="color: #FF0000">"rails_root"</span><span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> routes_path
+ File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">,</span> <span style="color: #FF0000">"config"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"routes.rb"</span><span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<div class="para"><p>Run <tt>rake</tt> to watch the test fail, then make the test pass add the following:</p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/lib/yaffle.rb</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">"yaffle/commands"</span>
+</tt></pre></div></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/lib/yaffle/commands.rb</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator'</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator/commands'</span>
+
+<span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Yaffle <span style="font-style: italic"><span style="color: #9A1900">#:nodoc:</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Generator <span style="font-style: italic"><span style="color: #9A1900">#:nodoc:</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Commands <span style="font-style: italic"><span style="color: #9A1900">#:nodoc:</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Create
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> yaffle_route
+ logger<span style="color: #990000">.</span>route <span style="color: #FF0000">"map.yaffle"</span>
+ look_for <span style="color: #990000">=</span> <span style="color: #FF0000">'ActionController::Routing::Routes.draw do |map|'</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">unless</span></span> options<span style="color: #990000">[:</span>pretend<span style="color: #990000">]</span>
+ gsub_file<span style="color: #990000">(</span><span style="color: #FF0000">'config/routes.rb'</span><span style="color: #990000">,</span> <span style="color: #FF6600">/(#{Regexp.escape(look_for)})/</span>mi<span style="color: #990000">)</span><span style="color: #FF0000">{</span><span style="color: #990000">|</span>match<span style="color: #990000">|</span> <span style="color: #FF0000">"#{match}\n map.yaffles\n"</span><span style="color: #FF0000">}</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Destroy
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> yaffle_route
+ logger<span style="color: #990000">.</span>route <span style="color: #FF0000">"map.yaffle"</span>
+ gsub_file <span style="color: #FF0000">'config/routes.rb'</span><span style="color: #990000">,</span> <span style="color: #FF6600">/\n.+?map\.yaffles/</span>mi<span style="color: #990000">,</span> <span style="color: #FF0000">''</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> List
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> yaffle_route
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">module</span></span> Update
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> yaffle_route
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Create<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Create
+Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Destroy<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Destroy
+Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>List<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>List
+Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Update<span style="color: #990000">.</span>send <span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #0000FF">include</span></span><span style="color: #990000">,</span> Yaffle<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Commands<span style="color: #990000">::</span>Update
+</tt></pre></div></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/generators/yaffle/yaffle_route_generator.rb</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">class</span></span> YaffleRouteGenerator <span style="color: #990000"><</span> Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Base
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> manifest
+ record <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>m<span style="color: #990000">|</span>
+ m<span style="color: #990000">.</span>yaffle_route
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<div class="para"><p>To see this work, type:</p></div>
+<div class="listingblock">
+<div class="content">
+<pre><tt>./script/generate yaffle_route
+./script/destroy yaffle_route</tt></pre>
+</div></div>
+<div class="admonitionblock">
+<table><tr>
+<td class="icon">
+<img src="./images/icons/note.png" alt="Note" />
+</td>
+<td class="content">
+<div class="title">Editor's note:</div>If you haven't set up the custom route from above, <em>script/destroy</em> will fail and you'll have to remove it manually.</td>
+</tr></table>
+</div>
+</div>
+<h2 id="_migrations">11. Migrations</h2>
+<div class="sectionbody">
+<div class="para"><p>If your plugin requires changes to the app's database you will likely want to somehow add migrations. Rails does not include any built-in support for calling migrations from plugins, but you can still make it easy for developers to call migrations from plugins.</p></div>
+<div class="para"><p>If you have a very simple needs, like creating a table that will always have the same name and columns, then you can use a more simple solution, like creating a custom rake task or method. If your migration needs user input to supply table names or other options, you probably want to opt for generating a migration.</p></div>
+<div class="para"><p>Let's say you have the following migration in your plugin:</p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/lib/db/migrate/20081116181115_create_birdhouses.rb:</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">class</span></span> CreateBirdhouses <span style="color: #990000"><</span> ActiveRecord<span style="color: #990000">::</span>Migration
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> <span style="font-weight: bold"><span style="color: #0000FF">self</span></span><span style="color: #990000">.</span>up
+ create_table <span style="color: #990000">:</span>birdhouses<span style="color: #990000">,</span> <span style="color: #990000">:</span>force <span style="color: #990000">=></span> <span style="font-weight: bold"><span style="color: #0000FF">true</span></span> <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>t<span style="color: #990000">|</span>
+ t<span style="color: #990000">.</span>string <span style="color: #990000">:</span>name
+ t<span style="color: #990000">.</span>timestamps
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> <span style="font-weight: bold"><span style="color: #0000FF">self</span></span><span style="color: #990000">.</span>down
+ drop_table <span style="color: #990000">:</span>birdhouses
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<div class="para"><p>Here are a few possibilities for how to allow developers to use your plugin migrations:</p></div>
+<h3 id="_create_a_custom_rake_task">11.1. Create a custom rake task</h3>
+<div class="para"><p><strong>vendor/plugins/yaffle/lib/db/migrate/20081116181115_create_birdhouses.rb:</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">class</span></span> CreateBirdhouses <span style="color: #990000"><</span> ActiveRecord<span style="color: #990000">::</span>Migration
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> <span style="font-weight: bold"><span style="color: #0000FF">self</span></span><span style="color: #990000">.</span>up
+ create_table <span style="color: #990000">:</span>birdhouses<span style="color: #990000">,</span> <span style="color: #990000">:</span>force <span style="color: #990000">=></span> <span style="font-weight: bold"><span style="color: #0000FF">true</span></span> <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>t<span style="color: #990000">|</span>
+ t<span style="color: #990000">.</span>string <span style="color: #990000">:</span>name
+ t<span style="color: #990000">.</span>timestamps
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> <span style="font-weight: bold"><span style="color: #0000FF">self</span></span><span style="color: #990000">.</span>down
+ drop_table <span style="color: #990000">:</span>birdhouses
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/tasks/yaffle.rake:</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt>namespace <span style="color: #990000">:</span>db <span style="font-weight: bold"><span style="color: #0000FF">do</span></span>
+ namespace <span style="color: #990000">:</span>migrate <span style="font-weight: bold"><span style="color: #0000FF">do</span></span>
+ desc <span style="color: #FF0000">"Migrate the database through scripts in vendor/plugins/yaffle/lib/db/migrate and update db/schema.rb by invoking db:schema:dump. Target specific version with VERSION=x. Turn off output with VERBOSE=false."</span>
+ task <span style="color: #990000">:</span>yaffle <span style="color: #990000">=></span> <span style="color: #990000">:</span>environment <span style="font-weight: bold"><span style="color: #0000FF">do</span></span>
+ ActiveRecord<span style="color: #990000">::</span>Migration<span style="color: #990000">.</span>verbose <span style="color: #990000">=</span> ENV<span style="color: #990000">[</span><span style="color: #FF0000">"VERBOSE"</span><span style="color: #990000">]</span> <span style="color: #990000">?</span> ENV<span style="color: #990000">[</span><span style="color: #FF0000">"VERBOSE"</span><span style="color: #990000">]</span> <span style="color: #990000">==</span> <span style="color: #FF0000">"true"</span> <span style="color: #990000">:</span> <span style="font-weight: bold"><span style="color: #0000FF">true</span></span>
+ ActiveRecord<span style="color: #990000">::</span>Migrator<span style="color: #990000">.</span>migrate<span style="color: #990000">(</span><span style="color: #FF0000">"vendor/plugins/yaffle/lib/db/migrate/"</span><span style="color: #990000">,</span> ENV<span style="color: #990000">[</span><span style="color: #FF0000">"VERSION"</span><span style="color: #990000">]</span> <span style="color: #990000">?</span> ENV<span style="color: #990000">[</span><span style="color: #FF0000">"VERSION"</span><span style="color: #990000">].</span>to_i <span style="color: #990000">:</span> <span style="font-weight: bold"><span style="color: #0000FF">nil</span></span><span style="color: #990000">)</span>
+ Rake<span style="color: #990000">::</span>Task<span style="color: #990000">[</span><span style="color: #FF0000">"db:schema:dump"</span><span style="color: #990000">].</span>invoke <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> ActiveRecord<span style="color: #990000">::</span>Base<span style="color: #990000">.</span>schema_format <span style="color: #990000">==</span> <span style="color: #990000">:</span>ruby
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<h3 id="_call_migrations_directly">11.2. Call migrations directly</h3>
+<div class="para"><p><strong>vendor/plugins/yaffle/lib/yaffle.rb:</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt>Dir<span style="color: #990000">.</span>glob<span style="color: #990000">(</span>File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>File<span style="color: #990000">.</span>dirname<span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">__FILE__</span></span><span style="color: #990000">),</span> <span style="color: #FF0000">"db"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"migrate"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"*"</span><span style="color: #990000">)).</span>each <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>file<span style="color: #990000">|</span>
+ <span style="font-weight: bold"><span style="color: #000080">require</span></span> file
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<div class="para"><p><strong>db/migrate/20081116181115_create_birdhouses.rb:</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">class</span></span> CreateBirdhouses <span style="color: #990000"><</span> ActiveRecord<span style="color: #990000">::</span>Migration
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> <span style="font-weight: bold"><span style="color: #0000FF">self</span></span><span style="color: #990000">.</span>up
+ Yaffle<span style="color: #990000">::</span>CreateBirdhouses<span style="color: #990000">.</span>up
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> <span style="font-weight: bold"><span style="color: #0000FF">self</span></span><span style="color: #990000">.</span>down
+ Yaffle<span style="color: #990000">::</span>CreateBirdhouses<span style="color: #990000">.</span>down
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<div class="admonitionblock">
+<table><tr>
+<td class="icon">
+<img src="./images/icons/note.png" alt="Note" />
+</td>
+<td class="content">
+<div class="title">Editor's note:</div>several plugin frameworks such as Desert and Engines provide more advanced plugin functionality.</td>
+</tr></table>
+</div>
+<h3 id="_generate_migrations">11.3. Generate migrations</h3>
+<div class="para"><p>Generating migrations has several advantages over other methods. Namely, you can allow other developers to more easily customize the migration. The flow looks like this:</p></div>
+<div class="ilist"><ul>
+<li>
+<p>
+call your script/generate script and pass in whatever options they need
+</p>
+</li>
+<li>
+<p>
+examine the generated migration, adding/removing columns or other options as necessary
+</p>
+</li>
+</ul></div>
+<div class="para"><p>This example will demonstrate how to use one of the built-in generator methods named <em>migration_template</em> to create a migration file. Extending the rails migration generator requires a somewhat intimate knowledge of the migration generator internals, so it's best to write a test first:</p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/test/yaffle_migration_generator_test.rb</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> File<span style="color: #990000">.</span>dirname<span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">__FILE__</span></span><span style="color: #990000">)</span> <span style="color: #990000">+</span> <span style="color: #FF0000">'/test_helper.rb'</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator'</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">'rails_generator/scripts/generate'</span>
+
+<span style="font-weight: bold"><span style="color: #0000FF">class</span></span> MigrationGeneratorTest <span style="color: #990000"><</span> Test<span style="color: #990000">::</span>Unit<span style="color: #990000">::</span>TestCase
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> setup
+ FileUtils<span style="color: #990000">.</span>mkdir_p<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">)</span>
+ <span style="color: #009900">@original_files</span> <span style="color: #990000">=</span> file_list
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> teardown
+ ActiveRecord<span style="color: #990000">::</span>Base<span style="color: #990000">.</span>pluralize_table_names <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #0000FF">true</span></span>
+ FileUtils<span style="color: #990000">.</span>rm_r<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> test_generates_correct_file_name
+ Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Scripts<span style="color: #990000">::</span>Generate<span style="color: #990000">.</span>new<span style="color: #990000">.</span>run<span style="color: #990000">([</span><span style="color: #FF0000">"yaffle_migration"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"some_name_nobody_is_likely_to_ever_use_in_a_real_migration"</span><span style="color: #990000">],</span> <span style="color: #990000">:</span>destination <span style="color: #990000">=></span> fake_rails_root<span style="color: #990000">)</span>
+ new_file <span style="color: #990000">=</span> <span style="color: #990000">(</span>file_list <span style="color: #990000">-</span> <span style="color: #009900">@original_files</span><span style="color: #990000">).</span>first
+ assert_match <span style="color: #FF6600">/add_yaffle_fields_to_some_name_nobody_is_likely_to_ever_use_in_a_real_migrations/</span><span style="color: #990000">,</span> new_file
+ assert_match <span style="color: #FF6600">/add_column :some_name_nobody_is_likely_to_ever_use_in_a_real_migrations do |t|/</span><span style="color: #990000">,</span> File<span style="color: #990000">.</span>read<span style="color: #990000">(</span>new_file<span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> test_pluralizes_properly
+ ActiveRecord<span style="color: #990000">::</span>Base<span style="color: #990000">.</span>pluralize_table_names <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #0000FF">false</span></span>
+ Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>Scripts<span style="color: #990000">::</span>Generate<span style="color: #990000">.</span>new<span style="color: #990000">.</span>run<span style="color: #990000">([</span><span style="color: #FF0000">"yaffle_migration"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"some_name_nobody_is_likely_to_ever_use_in_a_real_migration"</span><span style="color: #990000">],</span> <span style="color: #990000">:</span>destination <span style="color: #990000">=></span> fake_rails_root<span style="color: #990000">)</span>
+ new_file <span style="color: #990000">=</span> <span style="color: #990000">(</span>file_list <span style="color: #990000">-</span> <span style="color: #009900">@original_files</span><span style="color: #990000">).</span>first
+ assert_match <span style="color: #FF6600">/add_yaffle_fields_to_some_name_nobody_is_likely_to_ever_use_in_a_real_migration/</span><span style="color: #990000">,</span> new_file
+ assert_match <span style="color: #FF6600">/add_column :some_name_nobody_is_likely_to_ever_use_in_a_real_migration do |t|/</span><span style="color: #990000">,</span> File<span style="color: #990000">.</span>read<span style="color: #990000">(</span>new_file<span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ private
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> fake_rails_root
+ File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>File<span style="color: #990000">.</span>dirname<span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">__FILE__</span></span><span style="color: #990000">),</span> <span style="color: #FF0000">'rails_root'</span><span style="color: #990000">)</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> file_list
+ Dir<span style="color: #990000">.</span>glob<span style="color: #990000">(</span>File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>fake_rails_root<span style="color: #990000">,</span> <span style="color: #FF0000">"db"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"migrate"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"*"</span><span style="color: #990000">))</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<div class="admonitionblock">
+<table><tr>
+<td class="icon">
+<img src="./images/icons/note.png" alt="Note" />
+</td>
+<td class="content">
+<div class="title">Editor's note:</div>the migration generator checks to see if a migation already exists, and it's hard-coded to check the <em>db/migrate</em> directory. As a result, if your test tries to generate a migration that already exists in the app, it will fail. The easy workaround is to make sure that the name you generate in your test is very unlikely to actually appear in the app.</td>
+</tr></table>
+</div>
+<div class="para"><p>After running the test with <em>rake</em> you can make it pass with:</p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/generators/yaffle/yaffle_generator.rb</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">class</span></span> YaffleMigrationGenerator <span style="color: #990000"><</span> Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>NamedBase
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> manifest
+ record <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>m<span style="color: #990000">|</span>
+ m<span style="color: #990000">.</span>migration_template <span style="color: #FF0000">'migration:migration.rb'</span><span style="color: #990000">,</span> <span style="color: #FF0000">"db/migrate"</span><span style="color: #990000">,</span> <span style="color: #FF0000">{</span><span style="color: #990000">:</span>assigns <span style="color: #990000">=></span> yaffle_local_assigns<span style="color: #990000">,</span>
+ <span style="color: #990000">:</span>migration_file_name <span style="color: #990000">=></span> <span style="color: #FF0000">"add_yaffle_fields_to_#{custom_file_name}"</span>
+ <span style="color: #FF0000">}</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ private
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> custom_file_name
+ custom_name <span style="color: #990000">=</span> class_name<span style="color: #990000">.</span>underscore<span style="color: #990000">.</span>downcase
+ custom_name <span style="color: #990000">=</span> custom_name<span style="color: #990000">.</span>pluralize <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> ActiveRecord<span style="color: #990000">::</span>Base<span style="color: #990000">.</span>pluralize_table_names
+ custom_name
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> yaffle_local_assigns
+ returning<span style="color: #990000">(</span>assigns <span style="color: #990000">=</span> <span style="color: #FF0000">{}</span><span style="color: #990000">)</span> <span style="font-weight: bold"><span style="color: #0000FF">do</span></span>
+ assigns<span style="color: #990000">[:</span>migration_action<span style="color: #990000">]</span> <span style="color: #990000">=</span> <span style="color: #FF0000">"add"</span>
+ assigns<span style="color: #990000">[:</span>class_name<span style="color: #990000">]</span> <span style="color: #990000">=</span> <span style="color: #FF0000">"add_yaffle_fields_to_#{custom_file_name}"</span>
+ assigns<span style="color: #990000">[:</span>table_name<span style="color: #990000">]</span> <span style="color: #990000">=</span> custom_file_name
+ assigns<span style="color: #990000">[:</span>attributes<span style="color: #990000">]</span> <span style="color: #990000">=</span> <span style="color: #990000">[</span>Rails<span style="color: #990000">::</span>Generator<span style="color: #990000">::</span>GeneratedAttribute<span style="color: #990000">.</span>new<span style="color: #990000">(</span><span style="color: #FF0000">"last_squawk"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"string"</span><span style="color: #990000">)]</span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+<div class="para"><p>The generator creates a new file in <em>db/migrate</em> with a timestamp and an <em>add_column</em> statement. It reuses the built in rails <tt>migration_template</tt> method, and reuses the built-in rails migration template.</p></div>
+<div class="para"><p>It's courteous to check to see if table names are being pluralized whenever you create a generator that needs to be aware of table names. This way people using your generator won't have to manually change the generated files if they've turned pluralization off.</p></div>
+<div class="para"><p>To run the generator, type the following at the command line:</p></div>
+<div class="listingblock">
+<div class="content">
+<pre><tt>./script/generate yaffle_migration bird</tt></pre>
+</div></div>
+<div class="para"><p>and you will see a new file:</p></div>
+<div class="para"><p><strong>db/migrate/20080529225649_add_yaffle_fields_to_birds.rb</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">class</span></span> AddYaffleFieldsToBirds <span style="color: #990000"><</span> ActiveRecord<span style="color: #990000">::</span>Migration
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> <span style="font-weight: bold"><span style="color: #0000FF">self</span></span><span style="color: #990000">.</span>up
+ add_column <span style="color: #990000">:</span>birds<span style="color: #990000">,</span> <span style="color: #990000">:</span>last_squawk<span style="color: #990000">,</span> <span style="color: #990000">:</span>string
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+ <span style="font-weight: bold"><span style="color: #0000FF">def</span></span> <span style="font-weight: bold"><span style="color: #0000FF">self</span></span><span style="color: #990000">.</span>down
+ remove_column <span style="color: #990000">:</span>birds<span style="color: #990000">,</span> <span style="color: #990000">:</span>last_squawk
+ <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+</tt></pre></div></div>
+</div>
+<h2 id="_rake_tasks">12. Rake tasks</h2>
+<div class="sectionbody">
<div class="para"><p>When you created the plugin with the built-in rails generator, it generated a rake file for you in <em>vendor/plugins/yaffle/tasks/yaffle.rake</em>. Any rake task you add here will be available to the app.</p></div>
<div class="para"><p>Many plugin authors put all of their rake tasks into a common namespace that is the same as the plugin, like so:</p></div>
<div class="para"><p><strong>vendor/plugins/yaffle/tasks/yaffle.rake</strong></p></div>
@@ -1510,25 +1697,93 @@ http://www.gnu.org/software/src-highlite --> <pre><tt>yaffle:squawk # Prints out the word 'Yaffle'</tt></pre>
</div></div>
<div class="para"><p>You can add as many files as you want in the tasks directory, and if they end in .rake Rails will pick them up.</p></div>
-<h3 id="_store_plugins_in_alternate_locations">10.3. Store plugins in alternate locations</h3>
-<div class="para"><p>You can store plugins wherever you want - you just have to add those plugins to the plugins path in <em>environment.rb</em>.</p></div>
-<div class="para"><p>Since the plugin is only loaded after the plugin paths are defined, you can't redefine this in your plugins - but it may be good to now.</p></div>
-<div class="para"><p>You can even store plugins inside of other plugins for complete plugin madness!</p></div>
+<div class="para"><p>Note that tasks from <em>vendor/plugins/yaffle/Rakefile</em> are not available to the main app.</p></div>
+</div>
+<h2 id="_plugingems">13. PluginGems</h2>
+<div class="sectionbody">
+<div class="para"><p>Turning your rails plugin into a gem is a simple and straightforward task. This section will cover how to turn your plugin into a gem. It will not cover how to distribute that gem.</p></div>
+<div class="para"><p>Historically rails plugins loaded the plugin's <em>init.rb</em> file. In fact some plugins contain all of their code in that one file. To be compatible with plugins, <em>init.rb</em> was moved to <em>rails/init.rb</em>.</p></div>
+<div class="para"><p>It's common practice to put any developer-centric rake tasks (such as tests, rdoc and gem package tasks) in <em>Rakefile</em>. A rake task that packages the gem might look like this:</p></div>
+<div class="para"><p><strong>vendor/plugins/yaffle/Rakefile:</strong></p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 2.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>config<span style="color: #990000">.</span>plugin_paths <span style="color: #990000"><<</span> File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>RAILS_ROOT<span style="color: #990000">,</span><span style="color: #FF0000">"vendor"</span><span style="color: #990000">,</span><span style="color: #FF0000">"plugins"</span><span style="color: #990000">,</span><span style="color: #FF0000">"yaffle"</span><span style="color: #990000">,</span><span style="color: #FF0000">"lib"</span><span style="color: #990000">,</span><span style="color: #FF0000">"plugins"</span><span style="color: #990000">)</span>
+<pre><tt>PKG_FILES <span style="color: #990000">=</span> FileList<span style="color: #990000">[</span>
+ <span style="color: #FF0000">'[a-zA-Z]*'</span><span style="color: #990000">,</span>
+ <span style="color: #FF0000">'generators/**/*'</span><span style="color: #990000">,</span>
+ <span style="color: #FF0000">'lib/**/*'</span><span style="color: #990000">,</span>
+ <span style="color: #FF0000">'rails/**/*'</span><span style="color: #990000">,</span>
+ <span style="color: #FF0000">'tasks/**/*'</span><span style="color: #990000">,</span>
+ <span style="color: #FF0000">'test/**/*'</span>
+<span style="color: #990000">]</span>
+
+spec <span style="color: #990000">=</span> Gem<span style="color: #990000">::</span>Specification<span style="color: #990000">.</span>new <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>s<span style="color: #990000">|</span>
+ s<span style="color: #990000">.</span>name <span style="color: #990000">=</span> <span style="color: #FF0000">"yaffle"</span>
+ s<span style="color: #990000">.</span>version <span style="color: #990000">=</span> <span style="color: #FF0000">"0.0.1"</span>
+ s<span style="color: #990000">.</span>author <span style="color: #990000">=</span> <span style="color: #FF0000">"Gleeful Yaffler"</span>
+ s<span style="color: #990000">.</span>email <span style="color: #990000">=</span> <span style="color: #FF0000">"yaffle@example.com"</span>
+ s<span style="color: #990000">.</span>homepage <span style="color: #990000">=</span> <span style="color: #FF0000">"http://yafflers.example.com/"</span>
+ s<span style="color: #990000">.</span>platform <span style="color: #990000">=</span> Gem<span style="color: #990000">::</span>Platform<span style="color: #990000">::</span>RUBY
+ s<span style="color: #990000">.</span>summary <span style="color: #990000">=</span> <span style="color: #FF0000">"Sharing Yaffle Goodness"</span>
+ s<span style="color: #990000">.</span>files <span style="color: #990000">=</span> PKG_FILES<span style="color: #990000">.</span>to_a
+ s<span style="color: #990000">.</span>require_path <span style="color: #990000">=</span> <span style="color: #FF0000">"lib"</span>
+ s<span style="color: #990000">.</span>has_rdoc <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #0000FF">false</span></span>
+ s<span style="color: #990000">.</span>extra_rdoc_files <span style="color: #990000">=</span> <span style="color: #990000">[</span><span style="color: #FF0000">"README"</span><span style="color: #990000">]</span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+desc <span style="color: #FF0000">'Turn this plugin into a gem.'</span>
+Rake<span style="color: #990000">::</span>GemPackageTask<span style="color: #990000">.</span>new<span style="color: #990000">(</span>spec<span style="color: #990000">)</span> <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>pkg<span style="color: #990000">|</span>
+ pkg<span style="color: #990000">.</span>gem_spec <span style="color: #990000">=</span> spec
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
</tt></pre></div></div>
-<h3 id="_create_your_own_plugin_loaders_and_plugin_locators">10.4. Create your own Plugin Loaders and Plugin Locators</h3>
-<div class="para"><p>If the built-in plugin behavior is inadequate, you can change almost every aspect of the location and loading process. You can write your own plugin locators and plugin loaders, but that's beyond the scope of this tutorial.</p></div>
-<h3 id="_use_custom_plugin_generators">10.5. Use Custom Plugin Generators</h3>
-<div class="para"><p>If you are an RSpec fan, you can install the <tt>rspec_plugin_generator</tt> gem, which will generate the spec folder and database for you. See <a href="http://github.com/pat-maddox/rspec-plugin-generator/tree/master">http://github.com/pat-maddox/rspec-plugin-generator/tree/master</a>.</p></div>
+<div class="para"><p>To build and install the gem locally, run the following commands:</p></div>
+<div class="listingblock">
+<div class="content">
+<pre><tt>cd vendor/plugins/yaffle
+rake gem
+sudo gem install pkg/yaffle-0.0.1.gem</tt></pre>
+</div></div>
+<div class="para"><p>To test this, create a new rails app, add <em>config.gem "yaffle"</em> to environment.rb and all of your plugin's functionality will be available to you.</p></div>
</div>
-<h2 id="_appendix">11. Appendix</h2>
+<h2 id="_rdoc_documentation">14. RDoc Documentation</h2>
<div class="sectionbody">
-<h3 id="_references">11.1. References</h3>
+<div class="para"><p>Once your plugin is stable and you are ready to deploy do everyone else a favor and document it! Luckily, writing documentation for your plugin is easy.</p></div>
+<div class="para"><p>The first step is to update the README file with detailed information about how to use your plugin. A few key things to include are:</p></div>
+<div class="ilist"><ul>
+<li>
+<p>
+Your name
+</p>
+</li>
+<li>
+<p>
+How to install
+</p>
+</li>
+<li>
+<p>
+How to add the functionality to the app (several examples of common use cases)
+</p>
+</li>
+<li>
+<p>
+Warning, gotchas or tips that might help save users time
+</p>
+</li>
+</ul></div>
+<div class="para"><p>Once your README is solid, go through and add rdoc comments to all of the methods that developers will use. It's also customary to add <em>#:nodoc:</em> comments to those parts of the code that are not part of the public api.</p></div>
+<div class="para"><p>Once your comments are good to go, navigate to your plugin directory and run:</p></div>
+<div class="listingblock">
+<div class="content">
+<pre><tt>rake rdoc</tt></pre>
+</div></div>
+</div>
+<h2 id="_appendix">15. Appendix</h2>
+<div class="sectionbody">
+<div class="para"><p>If you prefer to use RSpec instead of Test::Unit, you may be interested in the <a href="http://github.com/pat-maddox/rspec-plugin-generator/tree/master">RSpec Plugin Generator</a>.</p></div>
+<h3 id="_references">15.1. References</h3>
<div class="ilist"><ul>
<li>
<p>
@@ -1550,41 +1805,104 @@ http://www.gnu.org/software/src-highlite --> <a href="http://daddy.platte.name/2007/05/rails-plugins-keep-initrb-thin.html">http://daddy.platte.name/2007/05/rails-plugins-keep-initrb-thin.html</a>
</p>
</li>
+<li>
+<p>
+<a href="http://www.mbleigh.com/2008/6/11/gemplugins-a-brief-introduction-to-the-future-of-rails-plugins">http://www.mbleigh.com/2008/6/11/gemplugins-a-brief-introduction-to-the-future-of-rails-plugins</a>
+</p>
+</li>
+<li>
+<p>
+<a href="http://weblog.jamisbuck.org/2006/10/26/monkey-patching-rails-extending-routes-2">http://weblog.jamisbuck.org/2006/10/26/monkey-patching-rails-extending-routes-2</a>.
+</p>
+</li>
</ul></div>
-<h3 id="_final_plugin_directory_structure">11.2. Final plugin directory structure</h3>
+<h3 id="_contents_of_em_lib_yaffle_rb_em">15.2. Contents of <em>lib/yaffle.rb</em></h3>
+<div class="para"><p><strong>vendor/plugins/yaffle/lib/yaffle.rb:</strong></p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 2.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">"yaffle/core_ext"</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">"yaffle/acts_as_yaffle"</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">"yaffle/commands"</span>
+<span style="font-weight: bold"><span style="color: #000080">require</span></span> <span style="color: #FF0000">"yaffle/routing"</span>
+
+<span style="color: #990000">%</span>w<span style="color: #FF0000">{</span> models controllers helpers <span style="color: #FF0000">}</span><span style="color: #990000">.</span>each <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #990000">|</span>dir<span style="color: #990000">|</span>
+ path <span style="color: #990000">=</span> File<span style="color: #990000">.</span>join<span style="color: #990000">(</span>File<span style="color: #990000">.</span>dirname<span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">__FILE__</span></span><span style="color: #990000">),</span> <span style="color: #FF0000">'app'</span><span style="color: #990000">,</span> dir<span style="color: #990000">)</span>
+ <span style="color: #009900">$LOAD_PATH</span> <span style="color: #990000"><<</span> path
+ ActiveSupport<span style="color: #990000">::</span>Dependencies<span style="color: #990000">.</span>load_paths <span style="color: #990000"><<</span> path
+ ActiveSupport<span style="color: #990000">::</span>Dependencies<span style="color: #990000">.</span>load_once_paths<span style="color: #990000">.</span>delete<span style="color: #990000">(</span>path<span style="color: #990000">)</span>
+<span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
+
+<span style="font-style: italic"><span style="color: #9A1900"># optionally:</span></span>
+<span style="font-style: italic"><span style="color: #9A1900"># Dir.glob(File.join(File.dirname(__FILE__), "db", "migrate", "*")).each do |file|</span></span>
+<span style="font-style: italic"><span style="color: #9A1900"># require file</span></span>
+<span style="font-style: italic"><span style="color: #9A1900"># end</span></span>
+
+</tt></pre></div></div>
+<h3 id="_final_plugin_directory_structure">15.3. Final plugin directory structure</h3>
<div class="para"><p>The final plugin should have a directory structure that looks something like this:</p></div>
<div class="listingblock">
<div class="content">
-<pre><tt> |-- MIT-LICENSE
- |-- README
- |-- Rakefile
- |-- generators
- | `-- yaffle
- | |-- USAGE
- | |-- templates
- | | `-- definition.txt
- | `-- yaffle_generator.rb
- |-- init.rb
- |-- install.rb
- |-- lib
- | |-- acts_as_yaffle.rb
- | |-- commands.rb
- | |-- core_ext.rb
- | |-- routing.rb
- | `-- view_helpers.rb
- |-- tasks
- | `-- yaffle_tasks.rake
- |-- test
- | |-- acts_as_yaffle_test.rb
- | |-- core_ext_test.rb
- | |-- database.yml
- | |-- debug.log
- | |-- routing_test.rb
- | |-- schema.rb
- | |-- test_helper.rb
- | `-- view_helpers_test.rb
- |-- uninstall.rb
- `-- yaffle_plugin.sqlite3.db</tt></pre>
+<pre><tt>|-- MIT-LICENSE
+|-- README
+|-- Rakefile
+|-- generators
+| |-- yaffle_definition
+| | |-- USAGE
+| | |-- templates
+| | | `-- definition.txt
+| | `-- yaffle_definition_generator.rb
+| |-- yaffle_migration
+| | |-- USAGE
+| | |-- templates
+| | `-- yaffle_migration_generator.rb
+| `-- yaffle_route
+| |-- USAGE
+| |-- templates
+| `-- yaffle_route_generator.rb
+|-- install.rb
+|-- lib
+| |-- app
+| | |-- controllers
+| | | `-- woodpeckers_controller.rb
+| | |-- helpers
+| | | `-- woodpeckers_helper.rb
+| | `-- models
+| | `-- woodpecker.rb
+| |-- db
+| | `-- migrate
+| | `-- 20081116181115_create_birdhouses.rb
+| |-- yaffle
+| | |-- acts_as_yaffle.rb
+| | |-- commands.rb
+| | |-- core_ext.rb
+| | `-- routing.rb
+| `-- yaffle.rb
+|-- pkg
+| `-- yaffle-0.0.1.gem
+|-- rails
+| `-- init.rb
+|-- tasks
+| `-- yaffle_tasks.rake
+|-- test
+| |-- acts_as_yaffle_test.rb
+| |-- core_ext_test.rb
+| |-- database.yml
+| |-- debug.log
+| |-- definition_generator_test.rb
+| |-- migration_generator_test.rb
+| |-- route_generator_test.rb
+| |-- routes_test.rb
+| |-- schema.rb
+| |-- test_helper.rb
+| |-- woodpecker_test.rb
+| |-- woodpeckers_controller_test.rb
+| |-- wookpeckers_helper_test.rb
+| |-- yaffle_plugin.sqlite3.db
+| `-- yaffle_test.rb
+`-- uninstall.rb</tt></pre>
</div></div>
</div>
|