Added the first part of Simply Helpful to core. The rest is pending a clean integartion of polymorphic urls [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6633 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

3 files changed, 83 insertions, 1 deletions

diff --git a/actionpack/lib/action_view/helpers/prototype_helper.rb b/actionpack/lib/action_view/helpers/prototype_helper.rb
index ed3f7b7d7f..9fa27d6386 100644
--- a/actionpack/lib/action_view/helpers/prototype_helper.rb
+++ b/actionpack/lib/action_view/helpers/prototype_helper.rb
@@ -384,8 +384,19 @@ module ActionView
           #   page['blank_slate']                  # => $('blank_slate');
           #   page['blank_slate'].show             # => $('blank_slate').show();
           #   page['blank_slate'].show('first').up # => $('blank_slate').show('first').up();
+          #
+          # You can also pass in a record, which will use ActionController::RecordIdentifier.dom_id to lookup
+          # the correct id:
+          #
+          #   page[@post]     # => $('post_45')
+          #   page[Post.new]  # => $('new_post')
           def [](id)
-            JavaScriptElementProxy.new(self, id)
+            case id
+              when String, Symbol, NilClass
+                JavaScriptElementProxy.new(self, id)
+              else
+                JavaScriptElementProxy.new(self, ActionController::RecordIdentifier.dom_id(id))
+            end
           end
           
           # Returns an object whose <tt>#to_json</tt> evaluates to +code+. Use this to pass a literal JavaScript 
diff --git a/actionpack/lib/action_view/helpers/record_identification_helper.rb b/actionpack/lib/action_view/helpers/record_identification_helper.rb
new file mode 100644
index 0000000000..2e5ff865cc
--- /dev/null
+++ b/actionpack/lib/action_view/helpers/record_identification_helper.rb
@@ -0,0 +1,16 @@
+module RecordIdentificationHelper
+  # See ActionController::RecordIdentifier.partial_path -- this is just a delegate to that for convenient access in the view.
+  def partial_path(*args, &block)
+    ActionController::RecordIdentifier.partial_path(*args, &block)
+  end
+
+  # See ActionController::RecordIdentifier.dom_class -- this is just a delegate to that for convenient access in the view.
+  def dom_class(*args, &block)
+    ActionController::RecordIdentifier.dom_class(*args, &block)
+  end
+
+  # See ActionController::RecordIdentifier.dom_id -- this is just a delegate to that for convenient access in the view.
+  def dom_id(*args, &block)
+    ActionController::RecordIdentifier.dom_id(*args, &block)
+  end
+end
\ No newline at end of file
diff --git a/actionpack/lib/action_view/helpers/record_tag_helper.rb b/actionpack/lib/action_view/helpers/record_tag_helper.rb
new file mode 100644
index 0000000000..29845ba147
--- /dev/null
+++ b/actionpack/lib/action_view/helpers/record_tag_helper.rb
@@ -0,0 +1,55 @@
+module RecordTagHelper
+  # Produces a wrapper DIV element with id and class parameters that
+  # relate to the specified ActiveRecord object. Usage example:
+  #
+  #    <% div_for(@person, :class => "foo") do %>
+  #       <%=h @person.name %>
+  #    <% end %>
+  #
+  # produces:
+  #
+  #    <div id="person_123" class="person foo"> Joe Bloggs </div>
+  #
+  def div_for(record, *args, &block)
+    content_tag_for(:div, record, *args, &block)
+  end
+  
+  # content_tag_for creates an HTML element with id and class parameters
+  # that relate to the specified ActiveRecord object. For example:
+  #
+  #    <% content_tag_for(:tr, @person) do %>
+  #      <td><%=h @person.first_name %></td>
+  #      <td><%=h @person.last_name %></td>
+  #    <% end %>
+  #
+  # would produce hthe following HTML (assuming @person is an instance of
+  # a Person object, with an id value of 123):
+  #
+  #    <tr id="person_123" class="person">....</tr>
+  #
+  # If you require the HTML id attribute to have a prefix, you can specify it:
+  #
+  #    <% content_tag_for(:tr, @person, :foo) do %> ...
+  #
+  # produces:
+  #    
+  #    <tr id="foo_person_123" class="person">...
+  #
+  # content_tag_for also accepts a hash of options, which will be converted to
+  # additional HTML attributes. If you specify a +:class+ value, it will be combined
+  # with the default class name for your object. For example:
+  #
+  #    <% content_tag_for(:li, @person, :class => "bar") %>...
+  #
+  # produces:
+  #
+  #    <li id="person_123" class="person bar">...
+  #
+  def content_tag_for(tag_name, record, *args, &block)
+    prefix  = args.first.is_a?(Hash) ? nil : args.shift
+    options = args.first.is_a?(Hash) ? args.shift : {}
+    concat content_tag(tag_name, capture(&block), 
+      options.merge({ :class => "#{dom_class(record)} #{options[:class]}".strip, :id => dom_id(record, prefix) })), 
+      block.binding
+  end
+end
\ No newline at end of file