From b84cee08c6129717d7c3291918f06f95cc9eb916 Mon Sep 17 00:00:00 2001
From: Prem Sichanugrist <s@sikachu.com>
Date: Fri, 2 Sep 2011 21:35:24 +0700
Subject: Make `content_tag_for` and `div_for` accepts the array of records

So instead of having to do this:

   @items.each do |item|
     content_tag_for(:li, item) do
        Title: <%= item.title %>
     end
   end

You can now do this:

   content_tag_for(:li, @items) do |item|
     Title: <%= item.title %>
   end
---
 .../lib/action_view/helpers/record_tag_helper.rb   | 56 ++++++++++++++++++++--
 1 file changed, 51 insertions(+), 5 deletions(-)

(limited to 'actionpack/lib/action_view')

diff --git a/actionpack/lib/action_view/helpers/record_tag_helper.rb b/actionpack/lib/action_view/helpers/record_tag_helper.rb
index 142a25f118..ad8896a2fd 100644
--- a/actionpack/lib/action_view/helpers/record_tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/record_tag_helper.rb
@@ -17,6 +17,19 @@ module ActionView
       #
       #    <div id="person_123" class="person foo"> Joe Bloggs </div>
       #
+      # You can also pass an array of Active Record objects, which will then
+      # get iterates over and yield each record as an argument for the block.
+      # For example:
+      #
+      #    <%= div_for(@people, :class => "foo") do |person| %>
+      #      <%= person.name %>
+      #    <% end %>
+      #
+      # produces:
+      #
+      #    <div id="person_123" class="person foo"> Joe Bloggs </div>
+      #    <div id="person_124" class="person foo"> Jane Bloggs </div>
+      #
       def div_for(record, *args, &block)
         content_tag_for(:div, record, *args, &block)
       end
@@ -42,6 +55,21 @@ module ActionView
       #
       #    <tr id="foo_person_123" class="person">...
       #
+      # You can also pass an array of objects which this method will loop through
+      # and yield the current object to the supplied block, reduce the need for
+      # having to iterate through the object (using <tt>each</tt>) beforehand.
+      # For example (assuming @people is an array of Person objects):
+      #
+      #    <%= content_tag_for(:tr, @people) do |person| %>
+      #      <td><%= person.first_name %></td>
+      #      <td><%= person.last_name %></td>
+      #    <% end %>
+      #
+      # produces:
+      #
+      #   <tr id="person_123" class="person">...</tr>
+      #   <tr id="person_124" class="person">...</tr>
+      #
       # content_tag_for also accepts a hash of options, which will be converted to
       # additional HTML attributes. If you specify a <tt>:class</tt> value, it will be combined
       # with the default class name for your object. For example:
@@ -52,12 +80,30 @@ module ActionView
       #
       #    <li id="person_123" class="person bar">...
       #
-      def content_tag_for(tag_name, record, prefix = nil, options = nil, &block)
-        options, prefix = prefix, nil if prefix.is_a?(Hash)
-        options ||= {}
-        options.merge!({ :class => "#{dom_class(record, prefix)} #{options[:class]}".strip, :id => dom_id(record, prefix) })
-        content_tag(tag_name, options, &block)
+      def content_tag_for(tag_name, single_or_multiple_records, prefix = nil, options = nil, &block)
+        if single_or_multiple_records.respond_to?(:to_ary)
+          single_or_multiple_records.to_ary.map do |single_record|
+            capture { content_tag_for_single_record(tag_name, single_record, prefix, options, &block) }
+          end.join("\n")
+        else
+          content_tag_for_single_record(tag_name, single_or_multiple_records, prefix, options, &block)
+        end
       end
+
+      private
+
+        # Called by <tt>content_tag_for</tt> internally to render a content tag
+        # for each record.
+        def content_tag_for_single_record(tag_name, record, prefix, options, &block)
+          options, prefix = prefix, nil if prefix.is_a?(Hash)
+          options ||= {}
+          options.merge!({ :class => "#{dom_class(record, prefix)} #{options[:class]}".strip, :id => dom_id(record, prefix) })
+          if block.arity == 0
+            content_tag(tag_name, capture(&block), options)
+          else
+            content_tag(tag_name, capture(record, &block), options)
+          end
+        end
     end
   end
 end
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