From 5137d03cc5b2a5f0820bdcf11b0fffe5bf461470 Mon Sep 17 00:00:00 2001
From: Prem Sichanugrist <s@sikachu.com>
Date: Sat, 1 Sep 2012 16:25:57 -0400
Subject: Rename the rest of the guides to Markdown

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-h2. The Basics of Creating Rails Plugins
-
-A Rails plugin is either an extension or a modification of the core framework. Plugins provide:
-
-* a way for developers to share bleeding-edge ideas without hurting the stable code base
-* a segmented architecture so that units of code can be fixed or updated on their own release schedule
-* an outlet for the core developers so that they don’t have to include every cool new feature under the sun
-
-After reading this guide you should be familiar with:
-
-* Creating a plugin from scratch
-* Writing and running tests for the plugin
-
-This guide describes how to build a test-driven plugin that will:
-
-* Extend core Ruby classes like Hash and String
-* Add methods to ActiveRecord::Base in the tradition of the 'acts_as' plugins
-* Give you information about where to put generators in your plugin.
-
-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.
-
-endprologue.
-
-h3. Setup
-
-_"vendored plugins"_ were available in previous versions of Rails, but they are deprecated in
-Rails 3.2, and will not be available in the future. 
-
-Currently, Rails plugins are built as gems, _gemified plugins_. They can be shared across 
-different rails applications using RubyGems and Bundler if desired. 
-
-h4. Generate a gemified plugin.
-
-
-Rails 3.1 ships with a +rails plugin new+ command which creates a
- skeleton for developing any kind of Rails extension with the ability
- to run integration tests using a dummy Rails application. See usage
- and options by asking for help:
-
-<shell>
-$ rails plugin --help
-</shell>
-
-h3. Testing your newly generated plugin
-
-You can navigate to the directory that contains the plugin, run the +bundle install+ command
- and run the one generated test using the +rake+ command.
-
-You should see:
-
-<shell>
-	2 tests, 2 assertions, 0 failures, 0 errors, 0 skips
-</shell>
-
-This will tell you that everything got generated properly and you are ready to start adding functionality.
-
-h3. Extending Core Classes
-
-This section will explain how to add a method to String that will be available anywhere in your rails application.
-
-In this example you will add a method to String named +to_squawk+. To begin, create a new test file with a few assertions:
-
-<ruby>
-# yaffle/test/core_ext_test.rb
-
-require 'test_helper'
-
-class CoreExtTest < Test::Unit::TestCase
-  def test_to_squawk_prepends_the_word_squawk
-    assert_equal "squawk! Hello World", "Hello World".to_squawk
-  end
-end
-</ruby>
-
-Run +rake+ to run the test. This test should fail because we haven't implemented the +to_squawk+ method:
-
-<shell>
-	  1) Error:
-	test_to_squawk_prepends_the_word_squawk(CoreExtTest):
-	NoMethodError: undefined method `to_squawk' for "Hello World":String
-	    test/core_ext_test.rb:5:in `test_to_squawk_prepends_the_word_squawk'
-</shell>
-
-Great - now you are ready to start development.
-
-Then in +lib/yaffle.rb+ require +lib/core_ext+:
-
-<ruby>
-# yaffle/lib/yaffle.rb
-
-require "yaffle/core_ext"
-
-module Yaffle
-end
-</ruby>
-
-Finally, create the +core_ext.rb+ file and add the +to_squawk+ method:
-
-<ruby>
-# yaffle/lib/yaffle/core_ext.rb
-
-String.class_eval do
-  def to_squawk
-    "squawk! #{self}".strip
-  end
-end
-</ruby>
-
-To test that your method does what it says it does, run the unit tests with +rake+ from your plugin directory.
-
-<shell>
-	3 tests, 3 assertions, 0 failures, 0 errors, 0 skips
-</shell>
-
-To see this in action, change to the test/dummy directory, fire up a console and start squawking:
-
-<shell>
-$ rails console
->> "Hello World".to_squawk
-=> "squawk! Hello World"
-</shell>
-
-h3. Add an "acts_as" Method to Active Record
-
-A common pattern in plugins is to add a method called 'acts_as_something' to models. In this case, you
-want to write a method called 'acts_as_yaffle' that adds a 'squawk' method to your Active Record models.
-
-To begin, set up your files so that you have:
-
-<ruby>
-# yaffle/test/acts_as_yaffle_test.rb
-
-require 'test_helper'
-
-class ActsAsYaffleTest < Test::Unit::TestCase
-end
-</ruby>
-
-<ruby>
-# yaffle/lib/yaffle.rb
-
-require "yaffle/core_ext"
-require 'yaffle/acts_as_yaffle'
-
-module Yaffle
-end
-</ruby>
-
-<ruby>
-# yaffle/lib/yaffle/acts_as_yaffle.rb
-
-module Yaffle
-  module ActsAsYaffle
-    # your code will go here
-  end
-end
-</ruby>
-
-h4. Add a Class Method
-
-This plugin will expect that you've added a method to your model named 'last_squawk'. However, the
-plugin users might have already defined a method on their model named 'last_squawk' that they use
-for something else. This plugin will allow the name to be changed by adding a class method called 'yaffle_text_field'.
-
-To start out, write a failing test that shows the behavior you'd like:
-
-<ruby>
-# yaffle/test/acts_as_yaffle_test.rb
-
-require 'test_helper'
-
-class ActsAsYaffleTest < Test::Unit::TestCase
-
-  def test_a_hickwalls_yaffle_text_field_should_be_last_squawk
-    assert_equal "last_squawk", Hickwall.yaffle_text_field
-  end
-
-  def test_a_wickwalls_yaffle_text_field_should_be_last_tweet
-    assert_equal "last_tweet", Wickwall.yaffle_text_field
-  end
-
-end
-</ruby>
-
-When you run +rake+, you should see the following:
-
-<shell>
-	  1) Error:
-	test_a_hickwalls_yaffle_text_field_should_be_last_squawk(ActsAsYaffleTest):
-	NameError: uninitialized constant ActsAsYaffleTest::Hickwall
-	    test/acts_as_yaffle_test.rb:6:in `test_a_hickwalls_yaffle_text_field_should_be_last_squawk'
-
-	  2) Error:
-	test_a_wickwalls_yaffle_text_field_should_be_last_tweet(ActsAsYaffleTest):
-	NameError: uninitialized constant ActsAsYaffleTest::Wickwall
-	    test/acts_as_yaffle_test.rb:10:in `test_a_wickwalls_yaffle_text_field_should_be_last_tweet'
-
-	5 tests, 3 assertions, 0 failures, 2 errors, 0 skips
-</shell>
-
-This tells us that we don't have the necessary models (Hickwall and Wickwall) that we are trying to test.
-We can easily generate these models in our "dummy" Rails application by running the following commands from the
-test/dummy directory:
-
-<shell>
-$ cd test/dummy
-$ rails generate model Hickwall last_squawk:string
-$ rails generate model Wickwall last_squawk:string last_tweet:string
-</shell>
-
-Now you can create the necessary database tables in your testing database by navigating to your dummy app
-and migrating the database. First
-
-<shell>
-$ cd test/dummy
-$ rake db:migrate
-$ rake db:test:prepare
-</shell>
-
-While you are here, change the Hickwall and Wickwall models so that they know that they are supposed to act
-like yaffles.
-
-<ruby>
-# test/dummy/app/models/hickwall.rb
-
-class Hickwall < ActiveRecord::Base
-  acts_as_yaffle
-end
-
-# test/dummy/app/models/wickwall.rb
-
-class Wickwall < ActiveRecord::Base
-  acts_as_yaffle :yaffle_text_field => :last_tweet
-end
-
-</ruby>
-
-We will also add code to define the acts_as_yaffle method.
-
-<ruby>
-# yaffle/lib/yaffle/acts_as_yaffle.rb
-module Yaffle
-  module ActsAsYaffle
-    extend ActiveSupport::Concern
-
-    included do
-    end
-
-    module ClassMethods
-      def acts_as_yaffle(options = {})
-        # your code will go here
-      end
-    end
-  end
-end
-
-ActiveRecord::Base.send :include, Yaffle::ActsAsYaffle
-</ruby>
-
-You can then return to the root directory (+cd ../..+) of your plugin and rerun the tests using +rake+.
-
-<shell>
-	  1) Error:
-	test_a_hickwalls_yaffle_text_field_should_be_last_squawk(ActsAsYaffleTest):
-	NoMethodError: undefined method `yaffle_text_field' for #<Class:0x000001016661b8>
-	    /Users/xxx/.rvm/gems/ruby-1.9.2-p136@xxx/gems/activerecord-3.0.3/lib/active_record/base.rb:1008:in `method_missing'
-	    test/acts_as_yaffle_test.rb:5:in `test_a_hickwalls_yaffle_text_field_should_be_last_squawk'
-
-	  2) Error:
-	test_a_wickwalls_yaffle_text_field_should_be_last_tweet(ActsAsYaffleTest):
-	NoMethodError: undefined method `yaffle_text_field' for #<Class:0x00000101653748>
-	    Users/xxx/.rvm/gems/ruby-1.9.2-p136@xxx/gems/activerecord-3.0.3/lib/active_record/base.rb:1008:in `method_missing'
-	    test/acts_as_yaffle_test.rb:9:in `test_a_wickwalls_yaffle_text_field_should_be_last_tweet'
-
-	5 tests, 3 assertions, 0 failures, 2 errors, 0 skips
-
-</shell>
-
-Getting closer... Now we will implement the code of the acts_as_yaffle method to make the tests pass.
-
-<ruby>
-# yaffle/lib/yaffle/acts_as_yaffle.rb
-
-module Yaffle
-  module ActsAsYaffle
-   extend ActiveSupport::Concern
-
-    included do
-    end
-
-    module ClassMethods
-      def acts_as_yaffle(options = {})
-        cattr_accessor :yaffle_text_field
-        self.yaffle_text_field = (options[:yaffle_text_field] || :last_squawk).to_s
-      end
-    end
-  end
-end
-
-ActiveRecord::Base.send :include, Yaffle::ActsAsYaffle
-</ruby>
-
-When you run +rake+ you should see the tests all pass:
-
-<shell>
-	5 tests, 5 assertions, 0 failures, 0 errors, 0 skips
-</shell>
-
-h4. Add an Instance Method
-
-This plugin will add a method named 'squawk' to any Active Record object that calls 'acts_as_yaffle'. The 'squawk'
-method will simply set the value of one of the fields in the database.
-
-To start out, write a failing test that shows the behavior you'd like:
-
-<ruby>
-# yaffle/test/acts_as_yaffle_test.rb
-require 'test_helper'
-
-class ActsAsYaffleTest < Test::Unit::TestCase
-
-  def test_a_hickwalls_yaffle_text_field_should_be_last_squawk
-    assert_equal "last_squawk", Hickwall.yaffle_text_field
-  end
-
-  def test_a_wickwalls_yaffle_text_field_should_be_last_tweet
-    assert_equal "last_tweet", Wickwall.yaffle_text_field
-  end
-
-  def test_hickwalls_squawk_should_populate_last_squawk
-    hickwall = Hickwall.new
-    hickwall.squawk("Hello World")
-    assert_equal "squawk! Hello World", hickwall.last_squawk
-  end
-
-  def test_wickwalls_squawk_should_populate_last_tweet
-    wickwall = Wickwall.new
-    wickwall.squawk("Hello World")
-    assert_equal "squawk! Hello World", wickwall.last_tweet
-  end
-end
-</ruby>
-
-Run the test to make sure the last two tests fail with an error that contains "NoMethodError: undefined method `squawk'",
-then update 'acts_as_yaffle.rb' to look like this:
-
-<ruby>
-# yaffle/lib/yaffle/acts_as_yaffle.rb	
-
-module Yaffle
-  module ActsAsYaffle
-    extend ActiveSupport::Concern
-
-    included do
-    end
-
-    module ClassMethods
-      def acts_as_yaffle(options = {})
-        cattr_accessor :yaffle_text_field
-        self.yaffle_text_field = (options[:yaffle_text_field] || :last_squawk).to_s
-
-        include Yaffle::ActsAsYaffle::LocalInstanceMethods
-      end
-    end
-
-    module LocalInstanceMethods
-      def squawk(string)
-        write_attribute(self.class.yaffle_text_field, string.to_squawk)
-      end
-    end
-  end
-end
-
-ActiveRecord::Base.send :include, Yaffle::ActsAsYaffle
-</ruby>
-
-Run +rake+ one final time and you should see:
-
-<shell>
-	7 tests, 7 assertions, 0 failures, 0 errors, 0 skips
-</shell>
-
-NOTE: The use of +write_attribute+ to write to the field in model is just one example of how a plugin can interact with the model, and will not always be the right method to use. For example, you could also use <tt>send("#{self.class.yaffle_text_field}=", string.to_squawk)</tt>.
-
-h3. Generators
-
-Generators can be included in your gem simply by creating them in a lib/generators directory of your plugin. More information about
-the creation of generators can be found in the "Generators Guide":generators.html
-
-h3. Publishing your Gem
-
-Gem plugins currently in development can easily be shared from any Git repository. To share the Yaffle gem with others, simply
-commit the code to a Git repository (like GitHub) and add a line to the Gemfile of the application in question:
-
-<ruby>
-gem 'yaffle', :git => 'git://github.com/yaffle_watcher/yaffle.git'
-</ruby>
-
-After running +bundle install+, your gem functionality will be available to the application.
-
-When the gem is ready to be shared as a formal release, it can be published to "RubyGems":http://www.rubygems.org.
-For more information about publishing gems to RubyGems, see: "Creating and Publishing Your First Ruby Gem":http://blog.thepete.net/2010/11/creating-and-publishing-your-first-ruby.html
-
-h3. RDoc Documentation
-
-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.
-
-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:
-
-* Your name
-* How to install
-* How to add the functionality to the app (several examples of common use cases)
-* Warnings, gotchas or tips that might help users and save them time
-
-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 '#:nodoc:' comments to those parts of the code that are not included in the public API.
-
-Once your comments are good to go, navigate to your plugin directory and run:
-
-<shell>
-$ rake rdoc
-</shell>
-
-h4. References
-
-* "Developing a RubyGem using Bundler":https://github.com/radar/guides/blob/master/gem-development.md
-* "Using .gemspecs as Intended":http://yehudakatz.com/2010/04/02/using-gemspecs-as-intended/
-* "Gemspec Reference":http://docs.rubygems.org/read/chapter/20
-* "GemPlugins: A Brief Introduction to the Future of Rails Plugins":http://www.intridea.com/blog/2008/6/11/gemplugins-a-brief-introduction-to-the-future-of-rails-plugins
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