Allow collection helpers with block to access current object in the collection

This gives a lot more flexibility to the user, for instance to generate
a collection of check boxes and labels, allowing to add custom classes
or data-* attributes to the label/check_box using another object
attribute.

This basically mimics options_for_select functionality that accepts a
third option for each item to generate html attributes for each option.

3 files changed, 10 insertions, 9 deletions

diff --git a/actionpack/lib/action_view/helpers/tags/collection_check_boxes.rb b/actionpack/lib/action_view/helpers/tags/collection_check_boxes.rb
index 5f1e9ec026..e23f5113fb 100644
--- a/actionpack/lib/action_view/helpers/tags/collection_check_boxes.rb
+++ b/actionpack/lib/action_view/helpers/tags/collection_check_boxes.rb
@@ -14,9 +14,9 @@ module ActionView
         end
 
         def render
-          rendered_collection = render_collection do |value, text, default_html_options|
+          rendered_collection = render_collection do |item, value, text, default_html_options|
             default_html_options[:multiple] = true
-            builder = instantiate_builder(CheckBoxBuilder, value, text, default_html_options)
+            builder = instantiate_builder(CheckBoxBuilder, item, value, text, default_html_options)
 
             if block_given?
               yield builder
diff --git a/actionpack/lib/action_view/helpers/tags/collection_helpers.rb b/actionpack/lib/action_view/helpers/tags/collection_helpers.rb
index 1e2e77dde1..6f950e552a 100644
--- a/actionpack/lib/action_view/helpers/tags/collection_helpers.rb
+++ b/actionpack/lib/action_view/helpers/tags/collection_helpers.rb
@@ -3,13 +3,14 @@ module ActionView
     module Tags
       module CollectionHelpers
         class Builder
-          attr_reader :text, :value
+          attr_reader :object, :text, :value
 
-          def initialize(template_object, object_name, method_name,
+          def initialize(template_object, object_name, method_name, object,
                          sanitized_attribute_name, text, value, input_html_options)
             @template_object = template_object
             @object_name = object_name
             @method_name = method_name
+            @object = object
             @sanitized_attribute_name = sanitized_attribute_name
             @text = text
             @value = value
@@ -32,8 +33,8 @@ module ActionView
 
         private
 
-        def instantiate_builder(builder_class, value, text, html_options)
-          builder_class.new(@template_object, @object_name, @method_name,
+        def instantiate_builder(builder_class, item, value, text, html_options)
+          builder_class.new(@template_object, @object_name, @method_name, item,
                             sanitize_attribute_name(value), text, value, html_options)
         end
 
@@ -71,7 +72,7 @@ module ActionView
             text  = value_for_collection(item, @text_method)
             default_html_options = default_html_options_for_collection(item, value)
 
-            yield value, text, default_html_options
+            yield item, value, text, default_html_options
           end.join.html_safe
         end
       end
diff --git a/actionpack/lib/action_view/helpers/tags/collection_radio_buttons.rb b/actionpack/lib/action_view/helpers/tags/collection_radio_buttons.rb
index 8e7aeeed63..ba2035f074 100644
--- a/actionpack/lib/action_view/helpers/tags/collection_radio_buttons.rb
+++ b/actionpack/lib/action_view/helpers/tags/collection_radio_buttons.rb
@@ -14,8 +14,8 @@ module ActionView
         end
 
         def render
-          render_collection do |value, text, default_html_options|
-            builder = instantiate_builder(RadioButtonBuilder, value, text, default_html_options)
+          render_collection do |item, value, text, default_html_options|
+            builder = instantiate_builder(RadioButtonBuilder, item, value, text, default_html_options)
 
             if block_given?
               yield builder