Fixed that setting request.format would also affect respond_to blocks [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7479 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Fixed that setting request.format would also affect respond_to blocks [DHH]
+
 * Add option to force binary mode on tempfile used for fixture_file_upload.  #6380 [Jonathan Viney]
 
 * Fixed that resource namespaces wouldn't stick to all nested resources #9399 [pixeltrix]

actionpack/lib/action_controller/request.rb

@@ -12,9 +12,6 @@ module ActionController
     # such as { 'RAILS_ENV' => 'production' }.
     attr_reader :env
 
-    # The requested content type, such as :html or :xml.
-    attr_writer :format
-
     # The HTTP request method as a lowercase symbol, such as :get.
     # Note, HEAD is returned as :get since the two are functionally
     # equivalent from the application's perspective.
@@ -90,6 +87,23 @@ module ActionController
     def format
       @format ||= parameters[:format] ? Mime::Type.lookup_by_extension(parameters[:format]) : accepts.first
     end
+    
+    
+    # Sets the format by string extension, which can be used to force custom formats that are not controlled by the extension.
+    # Example:
+    #
+    #   class ApplicationController < ActionController::Base
+    #     before_filter :adjust_format_for_iphone
+    #   
+    #     private
+    #       def adjust_format_for_iphone
+    #         request.format = :iphone if request.env["HTTP_USER_AGENT"][/iPhone/]
+    #       end
+    #   end
+    def format=(extension)
+      parameters[:format] = extension.to_s
+      format
+    end
 
     # Returns true if the request's "X-Requested-With" header contains
     # "XMLHttpRequest". (The Prototype Javascript library sends this header with

actionpack/test/controller/mime_responds_test.rb

@@ -35,6 +35,15 @@ class RespondToController < ActionController::Base
     end
   end
 
+  def forced_xml
+    request.format = :xml
+
+    respond_to do |type|
+      type.html { render :text => "HTML"    }
+      type.xml  { render :text => "XML"     }
+    end
+  end
+
   def just_xml
     respond_to do |type|
       type.xml  { render :text => "XML" }
@@ -343,6 +352,14 @@ class MimeControllerTest < Test::Unit::TestCase
     assert_equal "RSS", @response.body
   end
 
+  def test_internally_forced_format
+    get :forced_xml
+    assert_equal "XML", @response.body
+
+    get :forced_xml, :format => "html"
+    assert_equal "XML", @response.body
+  end
+
   def test_extension_synonyms
     get :html_xml_or_rss, :format => "xhtml"
     assert_equal "HTML", @response.body