Make controller namespace partial prefix optional

config.action_view.prefix_partial_path_with_controller_namespace

This allows you to choose to render @post using
/posts/_post.erb instead of /admin/posts/_post.erb
inside Admin::PostsController.

actionpack/lib/action_view/base.rb

@@ -141,6 +141,12 @@ class Base
     cattr_accessor :streaming_completion_on_exception
     @@streaming_completion_on_exception = %("><script type="text/javascript">window.location = "/500.html"</script></html>)
 
+    # Specify whether rendering within namespaced controllers should prefix
+    # the partial paths for ActiveModel objects with the namespace.
+    # (e.g., an Admin::PostsController would render @post using /admin/posts/_post.erb)
+    cattr_accessor :prefix_partial_path_with_controller_namespace
+    @@prefix_partial_path_with_controller_namespace = true
+
     class_attribute :helpers
     class_attribute :_routes
     class_attribute :logger

actionpack/lib/action_view/renderer/partial_renderer.rb

@@ -245,12 +245,11 @@ module ActionView
   #     <%- end -%>
   #   <% end %>
   class PartialRenderer < AbstractRenderer
-    PARTIAL_NAMES = Hash.new { |h,k| h[k] = {} }
+    PREFIXED_PARTIAL_NAMES = Hash.new { |h,k| h[k] = {} }
 
     def initialize(*)
       super
       @context_prefix = @lookup_context.prefixes.first
-      @partial_names = PARTIAL_NAMES[@context_prefix]
     end
 
     def render(context, options, block)
@@ -423,7 +422,15 @@ def partial_path(object = @object)
         raise ArgumentError.new("'#{object.inspect}' is not an ActiveModel-compatible object. It must implement :to_partial_path.")
       end
 
-      @partial_names[path] ||= merge_prefix_into_object_path(@context_prefix, path.dup)
+      if @view.prefix_partial_path_with_controller_namespace
+        prefixed_partial_names[path] ||= merge_prefix_into_object_path(@context_prefix, path.dup)
+      else
+        path
+      end
+    end
+
+    def prefixed_partial_names
+      @prefixed_partial_names ||= PREFIXED_PARTIAL_NAMES[@context_prefix]
     end
 
     def merge_prefix_into_object_path(prefix, object_path)

actionpack/test/activerecord/render_partial_with_record_identification_test.rb

@@ -131,13 +131,39 @@ class RenderPartialWithRecordIdentificationAndNestedControllersTest < ActiveReco
   def test_render_with_record_in_nested_controller
     get :render_with_record_in_nested_controller
     assert_template %r{\Afun/games/_game\Z}
-    assert_equal 'Pong', @response.body
+    assert_equal "Fun Pong\n", @response.body
   end
 
   def test_render_with_record_collection_in_nested_controller
     get :render_with_record_collection_in_nested_controller
     assert_template %r{\Afun/games/_game\Z}
-    assert_equal 'PongTank', @response.body
+    assert_equal "Fun Pong\nFun Tank\n", @response.body
+  end
+end
+
+class RenderPartialWithRecordIdentificationAndNestedControllersWithoutPrefixTest < ActiveRecordTestCase
+  tests Fun::NestedController
+
+  def test_render_with_record_in_nested_controller
+    old_config = ActionView::Base.prefix_partial_path_with_controller_namespace
+    ActionView::Base.prefix_partial_path_with_controller_namespace = false
+
+    get :render_with_record_in_nested_controller
+    assert_template %r{\Agames/_game\Z}
+    assert_equal "Just Pong\n", @response.body
+  ensure
+    ActionView::Base.prefix_partial_path_with_controller_namespace = old_config
+  end
+
+  def test_render_with_record_collection_in_nested_controller
+    old_config = ActionView::Base.prefix_partial_path_with_controller_namespace
+    ActionView::Base.prefix_partial_path_with_controller_namespace = false
+
+    get :render_with_record_collection_in_nested_controller
+    assert_template %r{\Agames/_game\Z}
+    assert_equal "Just Pong\nJust Tank\n", @response.body
+  ensure
+    ActionView::Base.prefix_partial_path_with_controller_namespace = old_config
   end
 end
 
@@ -147,12 +173,38 @@ class RenderPartialWithRecordIdentificationAndNestedDeeperControllersTest < Acti
   def test_render_with_record_in_deeper_nested_controller
     get :render_with_record_in_deeper_nested_controller
     assert_template %r{\Afun/serious/games/_game\Z}
-    assert_equal 'Chess', @response.body
+    assert_equal "Serious Chess\n", @response.body
   end
 
   def test_render_with_record_collection_in_deeper_nested_controller
     get :render_with_record_collection_in_deeper_nested_controller
     assert_template %r{\Afun/serious/games/_game\Z}
-    assert_equal 'ChessSudokuSolitaire', @response.body
+    assert_equal "Serious Chess\nSerious Sudoku\nSerious Solitaire\n", @response.body
+  end
+end
+
+class RenderPartialWithRecordIdentificationAndNestedDeeperControllersWithoutPrefixTest < ActiveRecordTestCase
+  tests Fun::Serious::NestedDeeperController
+
+  def test_render_with_record_in_deeper_nested_controller
+    old_config = ActionView::Base.prefix_partial_path_with_controller_namespace
+    ActionView::Base.prefix_partial_path_with_controller_namespace = false
+
+    get :render_with_record_in_deeper_nested_controller
+    assert_template %r{\Agames/_game\Z}
+    assert_equal "Just Chess\n", @response.body
+  ensure
+    ActionView::Base.prefix_partial_path_with_controller_namespace = old_config
+  end
+
+  def test_render_with_record_collection_in_deeper_nested_controller
+    old_config = ActionView::Base.prefix_partial_path_with_controller_namespace
+    ActionView::Base.prefix_partial_path_with_controller_namespace = false
+
+    get :render_with_record_collection_in_deeper_nested_controller
+    assert_template %r{\Agames/_game\Z}
+    assert_equal "Just Chess\nJust Sudoku\nJust Solitaire\n", @response.body
+  ensure
+    ActionView::Base.prefix_partial_path_with_controller_namespace = old_config
   end
 end

actionpack/test/fixtures/fun/games/_game.erb

-<%= game.name %>
\ No newline at end of file
+Fun <%= game.name %>

actionpack/test/fixtures/fun/serious/games/_game.erb

-<%= game.name %>
\ No newline at end of file
+Serious <%= game.name %>

actionpack/test/fixtures/games/_game.erb

+Just <%= game.name %>

guides/source/configuring.textile

@@ -354,8 +354,7 @@ h4. Configuring Action Dispatch
 
 h4. Configuring Action View
 
-There are only a few configuration options for Action View, starting with six on +ActionView::Base+:
-
+<tt>config.action_view</tt> includes a small number of configuration settings:
 
 * +config.action_view.field_error_proc+ provides an HTML generator for displaying errors that come from Active Record. The default is
 
@@ -397,6 +396,14 @@ And can reference in the view with the following code:
 
 * +config.action_view.embed_authenticity_token_in_remote_forms+ allows you to set the default behavior for +authenticity_token+ in forms with +:remote => true+. By default it's set to false, which means that remote forms will not include +authenticity_token+, which is helpful when you're fragment-caching the form. Remote forms get the authenticity from the +meta+ tag, so embedding is unnecessary unless you support browsers without JavaScript. In such case you can either pass +:authenticity_token => true+ as a form option or set this config setting to +true+
 
+* +config.action_view.prefix_partial_path_with_controller_namespace+ determines whether or not partials are looked up from a subdirectory in templates rendered from namespaced controllers. For example, consider a controller named +Admin::PostsController+ which renders this template:
+
+<erb>
+<%= render @post %>
+<erb>
+
+The default setting is +true+, which uses the partial at +/admin/posts/_post.erb+. Setting the value to +false+ would render +/posts/_post.erb+, which is the same behavior as rendering from a non-namespaced controller such as +PostsController+.
+
 h4. Configuring Action Mailer
 
 There are a number of settings available on +config.action_mailer+: