Add content_for?(:name) helper to check if content_for(:name) is pres…

…ent [#1311 state:resolved] Signed-off-by: Pratik Naik <pratiknaik@gmail.com>
rails · Jun 21, 2009 · 9cb8c81 · 9cb8c81
1 parent 66eb058
commit 9cb8c81
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diff --git a/actionpack/lib/action_view/helpers/capture_helper.rb b/actionpack/lib/action_view/helpers/capture_helper.rb
@@ -117,6 +117,28 @@ def content_for(name, content = nil, &block)
         @_content_for[name]
       end
 
+      # content_for? simply checks whether any content has been captured yet using content_for
+      # Useful to render parts of your layout differently based on what is in your views.
+      # 
+      # ==== Examples
+      #
+      # Perhaps you will use different css in you layout if no content_for :right_column
+      #
+      #   <%# This is the layout %>
+      #   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+      #   <head>
+      #	    <title>My Website</title>
+      #	    <%= yield :script %>
+      #   </head>
+      #   <body class="<%= content_for?(:right_col) ? 'one-column' : 'two-column' %>">
+      #     <%= yield %>
+      #     <%= yield :right_col %>
+      #   </body>
+      #   </html>
+      def content_for?(name)
+        @_content_for[name].present?
+      end
+
       # Use an alternate output buffer for the duration of the block.
       # Defaults to a new empty string.
       def with_output_buffer(buf = nil) #:nodoc:

diff --git a/actionpack/test/template/capture_helper_test.rb b/actionpack/test/template/capture_helper_test.rb
@@ -0,0 +1,15 @@
+require 'abstract_unit'
+
+class CaptureHelperTest < ActionView::TestCase
+  def setup
+    super
+    @_content_for = Hash.new {|h,k| h[k] = "" }
+  end
+
+  def test_content_for
+    assert ! content_for?(:title)
+    content_for :title, 'title'
+    assert content_for?(:title)
+    assert ! content_for?(:something_else)
+  end
+end