Pass :id => nil or :class => nil to error_messages_for to supress that html...

Pass :id => nil or :class => nil to error_messages_for to supress that html attribute. Closes #3586.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4592 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

 *SVN*
 
+* Pass :id => nil or :class => nil to error_messages_for to supress that html attribute. #3586 [olivier_ansaldi@yahoo.com, sebastien@goetzilla.info]
+
 * Reset @html_document between requests so assert_tag works. #4810 [jarkko@jlaine.net, easleydp@gmail.com]
 
 * Update render :partial documentation. #5646 [matt@mattmargolis.net]

actionpack/lib/action_view/helpers/active_record_helper.rb

@@ -120,13 +120,23 @@ def error_messages_for(*params)
         objects = params.collect {|object_name| instance_variable_get("@#{object_name}") }.compact
         count   = objects.inject(0) {|sum, object| sum + object.errors.count }
         unless count.zero?
+          html = {}
+          [:id, :class].each do |key|
+            if options.include?(key)
+              value = options[key]
+              html[key] = value unless value.blank?
+            else
+              html[key] = 'errorExplanation'
+            end
+          end
           header_message = "#{pluralize(count, 'error')} prohibited this #{(options[:object_name] || params.first).to_s.gsub('_', ' ')} from being saved"
           error_messages = objects.map {|object| object.errors.full_messages.map {|msg| content_tag(:li, msg) } }
           content_tag(:div,
             content_tag(options[:header_tag] || :h2, header_message) <<
-            content_tag(:p, 'There were problems with the following fields:') <<
-            content_tag(:ul, error_messages), 
-            :id => options[:id] || 'errorExplanation', :class => options[:class] || 'errorExplanation')
+              content_tag(:p, 'There were problems with the following fields:') <<
+              content_tag(:ul, error_messages),
+            html
+          )
         else
           ''
         end

actionpack/test/template/active_record_helper_test.rb

@@ -152,6 +152,8 @@ def Post.content_columns() [ Column.new(:datetime, "written_on", "Written on") ]
   def test_error_for_block
     assert_dom_equal %(<div class="errorExplanation" id="errorExplanation"><h2>1 error prohibited this post from being saved</h2><p>There were problems with the following fields:</p><ul><li>Author name can't be empty</li></ul></div>), error_messages_for("post")
     assert_equal %(<div class="errorDeathByClass" id="errorDeathById"><h1>1 error prohibited this post from being saved</h1><p>There were problems with the following fields:</p><ul><li>Author name can't be empty</li></ul></div>), error_messages_for("post", :class => "errorDeathByClass", :id => "errorDeathById", :header_tag => "h1")
+    assert_equal %(<div id="errorDeathById"><h1>1 error prohibited this post from being saved</h1><p>There were problems with the following fields:</p><ul><li>Author name can't be empty</li></ul></div>), error_messages_for("post", :class => nil, :id => "errorDeathById", :header_tag => "h1")
+    assert_equal %(<div class="errorDeathByClass"><h1>1 error prohibited this post from being saved</h1><p>There were problems with the following fields:</p><ul><li>Author name can't be empty</li></ul></div>), error_messages_for("post", :class => "errorDeathByClass", :id => nil, :header_tag => "h1")
   end
   
   def test_error_messages_for_handles_nil