Added PartialIteration class used when rendering collections

The iteration object is available as the local variable
"template_name_iteration" when rendering partials with collections.

It gives access to the +size+ of the collection beeing iterated over,
the current +index+ and two convinicence methods +first?+ and +last?+

"template_name_counter" variable is kept but is deprecated.

[Joel Junström + Lucas Uyezu]

1 files changed, 19 insertions, 0 deletions

diff --git a/actionpack/lib/action_view/partial_iteration.rb b/actionpack/lib/action_view/partial_iteration.rb
new file mode 100644
index 0000000000..5b33a40722
--- /dev/null
+++ b/actionpack/lib/action_view/partial_iteration.rb
@@ -0,0 +1,19 @@
+module ActionView
+  class PartialIteration # :nodoc:
+    attr_reader :size, :index
+
+    def initialize(size, index)
+      @size  = size
+      @index = index
+    end
+
+    def first?
+      index == 0
+    end
+
+    def last?
+      index == size - 1
+    end
+
+  end
+end