Check if the options hash already exists and merge it with the another

hash.

Closes #2492 and #5615

actionpack/lib/action_view/helpers/form_helper.rb

@@ -1117,17 +1117,10 @@ def fields_for(record_name, record_object = nil, fields_options = {}, &block)
         @template.fields_for(record_name, record_object, fields_options, &block)
       end
 
-      def label(method, content_or_options = nil, options = {}, &block)
-        if content_or_options.is_a?(Hash)
-          content_or_options = objectify_options(content_or_options)
-        else
-          options = objectify_options(options)
-        end
-
-        @template.label(@object_name, method, content_or_options, options, &block)
+      def label(method, text = nil, options = {}, &block)
+        @template.label(@object_name, method, text, objectify_options(options), &block)
       end
 
-
       def check_box(method, options = {}, checked_value = "1", unchecked_value = "0")
         @template.check_box(@object_name, method, objectify_options(options), checked_value, unchecked_value)
       end

actionpack/lib/action_view/helpers/tags/label.rb

@@ -3,16 +3,16 @@ module Helpers
     module Tags
       class Label < Base #:nodoc:
         def initialize(object_name, method_name, template_object, content_or_options = nil, options = nil)
+          options ||= {}
+
           content_is_options = content_or_options.is_a?(Hash)
           if content_is_options
-            options = content_or_options
+            options.merge! content_or_options
             @content = nil
           else
             @content = content_or_options
           end
 
-          options ||= {}
-
           super(object_name, method_name, template_object, options)
         end
 

actionpack/test/template/form_helper_test.rb

@@ -1046,10 +1046,24 @@ def test_form_for_with_nil_index_option_override
     assert_dom_equal expected, output_buffer
   end
 
+  def test_form_for_label_error_wrapping
+    form_for(@post) do |f|
+      concat f.label(:author_name, :class => 'label')
+      concat f.text_field(:author_name)
+      concat f.submit('Create post')
+    end
+
+    expected = whole_form('/posts/123', 'edit_post_123' , 'edit_post', 'patch') do
+      "<div class='field_with_errors'><label for='post_author_name' class='label'>Author name</label></div>" +
+      "<div class='field_with_errors'><input name='post[author_name]' type='text' id='post_author_name' value='' /></div>" +
+      "<input name='commit' type='submit' value='Create post' />"
+    end
+
+    assert_dom_equal expected, output_buffer
+  end
+
   def test_form_for_label_error_wrapping_without_conventional_instance_variable
     post = remove_instance_variable :@post
-    default_field_error_proc = ActionView::Base.field_error_proc
-    ActionView::Base.field_error_proc = Proc.new{ |html_tag, instance| "<div class='error'>#{html_tag}</div>".html_safe }
 
     form_for(post) do |f|
       concat f.label(:author_name, :class => 'label')
@@ -1058,14 +1072,12 @@ def test_form_for_label_error_wrapping_without_conventional_instance_variable
     end
 
     expected = whole_form('/posts/123', 'edit_post_123' , 'edit_post', 'patch') do
-      "<div class='error'><label for='post_author_name' class='label'>Author name</label></div>" +
-      "<div class='error'><input name='post[author_name]' type='text' id='post_author_name' value='' /></div>" +
+      "<div class='field_with_errors'><label for='post_author_name' class='label'>Author name</label></div>" +
+      "<div class='field_with_errors'><input name='post[author_name]' type='text' id='post_author_name' value='' /></div>" +
       "<input name='commit' type='submit' value='Create post' />"
     end
 
     assert_dom_equal expected, output_buffer
-  ensure
-    ActionView::Base.field_error_proc = default_field_error_proc
   end
 
   def test_form_for_with_namespace