Extract common collection helpers to a module to avoid too much inheritance

[Carlos Antonio da Silva + Rafael Mendonça França]

1 files changed, 84 insertions, 0 deletions

diff --git a/actionpack/lib/action_view/helpers/tags/collection_helpers.rb b/actionpack/lib/action_view/helpers/tags/collection_helpers.rb
new file mode 100644
index 0000000000..1c9ba8598f
--- /dev/null
+++ b/actionpack/lib/action_view/helpers/tags/collection_helpers.rb
@@ -0,0 +1,84 @@
+module ActionView
+  module Helpers
+    module Tags
+      module CollectionHelpers
+        class Builder
+          def initialize(template_object, object_name, method_name,
+                         sanitized_attribute_name, text, value, input_html_options)
+            @template_object = template_object
+            @object_name = object_name
+            @method_name = method_name
+            @sanitized_attribute_name = sanitized_attribute_name
+            @text = text
+            @value = value
+            @input_html_options = input_html_options
+          end
+
+          def label(label_html_options={}, &block)
+            @template_object.label(@object_name, @sanitized_attribute_name, @text, label_html_options, &block)
+          end
+        end
+
+        def initialize(object_name, method_name, template_object, collection, value_method, text_method, options, html_options)
+          @collection   = collection
+          @value_method = value_method
+          @text_method  = text_method
+          @html_options = html_options
+
+          super(object_name, method_name, template_object, options)
+        end
+
+        private
+
+        def instantiate_builder(builder_class, value, text, html_options)
+          builder_class.new(@template_object, @object_name, @method_name,
+                            sanitize_attribute_name(value), text, value, html_options)
+
+        end
+
+        # Generate default options for collection helpers, such as :checked and
+        # :disabled.
+        def default_html_options_for_collection(item, value) #:nodoc:
+          html_options = @html_options.dup
+
+          [:checked, :selected, :disabled].each do |option|
+            next unless @options[option]
+
+
+            accept = if @options[option].respond_to?(:call)
+                       @options[option].call(item)
+                     else
+                       Array(@options[option]).include?(value)
+                     end
+
+            if accept
+              html_options[option] = true
+            elsif option == :checked
+              html_options[option] = false
+            end
+          end
+
+          html_options
+        end
+
+        def sanitize_attribute_name(value) #:nodoc:
+          "#{sanitized_method_name}_#{sanitized_value(value)}"
+        end
+
+        def render_collection #:nodoc:
+          @collection.map do |item|
+            value = value_for_collection(item, @value_method)
+            text  = value_for_collection(item, @text_method)
+            default_html_options = default_html_options_for_collection(item, value)
+
+            yield value, text, default_html_options
+          end.join.html_safe
+        end
+
+        def value_for_collection(item, value) #:nodoc:
+          value.respond_to?(:call) ? value.call(item) : item.send(value)
+        end
+      end
+    end
+  end
+end