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]

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

actionview/lib/action_view/renderer/partial_renderer.rb

@@ -1,4 +1,5 @@
 require 'thread_safe'
+require "action_view/partial_iteration"
 
 module ActionView
   # = Action View Partials
@@ -56,8 +57,12 @@ module ActionView
   #   <%= render partial: "ad", collection: @advertisements %>
   #
   # This will render "advertiser/_ad.html.erb" and pass the local variable +ad+ to the template for display. An
-  # iteration counter will automatically be made available to the template with a name of the form
-  # +partial_name_counter+. In the case of the example above, the template would be fed +ad_counter+.
+  # iteration object will automatically be made available to the template with a name of the form
+  # +partial_name_iteration+. The iteration object has knowledge about which index the current object has in
+  # the collection and the total size of the collection. The iteration object also has two convenience methods,
+  # +first?+ and +last?+. In the case of the example above, the template would be fed +ad_iteration+.
+  # For backwards compatibility the +partial_name_counter+ is still present and is mapped to the iteration's
+  # +index+ method.
   #
   # The <tt>:as</tt> option may be used when rendering partials.
   #
@@ -352,7 +357,7 @@ module ActionView
       end
 
       if @path
-        @variable, @variable_counter = retrieve_variable(@path, as)
+        @variable, @variable_counter, @variable_iteration = retrieve_variable(@path, as)
         @template_keys = retrieve_template_keys
       else
         paths.map! { |path| retrieve_variable(path, as).unshift(path) }
@@ -385,7 +390,7 @@ module ActionView
 
     def collection_with_template
       view, locals, template = @view, @locals, @template
-      as, counter = @variable, @variable_counter
+      as, counter, iteration = @variable, @variable_counter, @variable_iteration
 
       if layout = @options[:layout]
         layout = find_template(layout, @template_keys)
@@ -393,8 +398,11 @@ module ActionView
 
       index = -1
       @collection.map do |object|
-        locals[as]      = object
-        locals[counter] = (index += 1)
+        index += 1
+
+        locals[as]        = object
+        locals[counter]   = index
+        locals[iteration] = PartialIteration.new(@collection.size, index)
 
         content = template.render(view, locals)
         content = layout.render(view, locals) { content } if layout
@@ -410,10 +418,11 @@ module ActionView
       index = -1
       @collection.map do |object|
         index += 1
-        path, as, counter = collection_data[index]
+        path, as, counter, iteration = collection_data[index]
 
-        locals[as]      = object
-        locals[counter] = index
+        locals[as]        = object
+        locals[counter]   = index
+        locals[iteration] = PartialIteration.new(@collection.size, index)
 
         template = (cache[path] ||= find_template(path, keys + [as, counter]))
         template.render(view, locals)
@@ -466,8 +475,11 @@ module ActionView
 
     def retrieve_template_keys
       keys = @locals.keys
-      keys << @variable         if @object || @collection
-      keys << @variable_counter if @collection
+      keys << @variable if @object || @collection
+      if @collection
+        keys << @variable_counter
+        keys << @variable_iteration
+      end
       keys
     end
 
@@ -477,8 +489,11 @@ module ActionView
         raise_invalid_identifier(path) unless base =~ /\A_?([a-z]\w*)(\.\w+)*\z/
         $1.to_sym
       end
-      variable_counter = :"#{variable}_counter" if @collection
-      [variable, variable_counter]
+      if @collection
+        variable_counter = :"#{variable}_counter"
+        variable_iteration = :"#{variable}_iteration"
+      end
+      [variable, variable_counter, variable_iteration]
     end
 
     IDENTIFIER_ERROR_MESSAGE = "The partial name (%s) is not a valid Ruby identifier; " +

actionview/test/actionpack/controller/render_test.rb

@@ -536,6 +536,14 @@ class TestController < ApplicationController
     render :partial => "customer_with_var", :collection => [ Customer.new("david"), Customer.new("mary") ], :as => :customer
   end
 
+  def partial_collection_with_iteration
+    render partial: "customer_iteration", collection: [ Customer.new("david"), Customer.new("mary"), Customer.new('christine') ]
+  end
+
+  def partial_collection_with_as_and_iteration
+    render partial: "customer_iteration_with_as", collection: [ Customer.new("david"), Customer.new("mary"), Customer.new('christine') ], as: :client
+  end
+
   def partial_collection_with_counter
     render :partial => "customer_counter", :collection => [ Customer.new("david"), Customer.new("mary") ]
   end
@@ -1237,6 +1245,16 @@ class RenderTest < ActionController::TestCase
     assert_equal "david david davidmary mary mary", @response.body
   end
 
+  def test_partial_collection_with_iteration
+    get :partial_collection_with_iteration
+    assert_equal "3-0: david-first3-1: mary3-2: christine-last", @response.body
+  end
+
+  def test_partial_collection_with_as_and_iteration
+    get :partial_collection_with_as_and_iteration
+    assert_equal "3-0: david-first3-1: mary3-2: christine-last", @response.body
+  end
+
   def test_partial_collection_with_counter
     get :partial_collection_with_counter
     assert_equal "david0mary1", @response.body

actionview/test/fixtures/actionpack/test/_customer_iteration.erb

@@ -0,0 +1 @@
+<%= customer_iteration_iteration.size %>-<%= customer_iteration_iteration.index %>: <%= customer_iteration.name %><%= '-first' if customer_iteration_iteration.first? %><%= '-last' if customer_iteration_iteration.last? %>

actionview/test/fixtures/actionpack/test/_customer_iteration_with_as.erb

@@ -0,0 +1 @@
+<%= client_iteration.size %>-<%= client_iteration.index %>: <%= client.name %><%= '-first' if client_iteration.first? %><%= '-last' if client_iteration.last? %>

actionview/test/template/partial_iteration_test.rb

@@ -0,0 +1,31 @@
+require 'abstract_unit'
+require 'action_view/partial_iteration'
+class PartialIterationTest < ActiveSupport::TestCase
+
+  def test_has_size_and_index
+    iteration = ActionView::PartialIteration.new 3, 0
+    assert_equal 0, iteration.index, "should be at the first index"
+    assert_equal 3, iteration.size, "should have the size"
+  end
+
+  def test_first_is_true_when_current_is_at_the_first_index
+    iteration = ActionView::PartialIteration.new 3, 0
+    assert iteration.first?, "first when current is 0"
+  end
+
+  def test_first_is_false_unless_current_is_at_the_first_index
+    iteration = ActionView::PartialIteration.new 3, 1
+    assert !iteration.first?, "not first when current is 1"
+  end
+
+  def test_last_is_true_when_current_is_at_the_last_index
+    iteration = ActionView::PartialIteration.new 3, 2
+    assert iteration.last?, "last when current is 2"
+  end
+
+  def test_last_is_false_unless_current_is_at_the_last_index
+    iteration = ActionView::PartialIteration.new 3, 0
+    assert !iteration.last?, "not last when current is 0"
+  end
+
+end

actionview/test/template/render_test.rb

@@ -256,7 +256,7 @@ module RenderTestCases
   end
 
   def test_render_partial_collection_without_as
-    assert_equal "local_inspector,local_inspector_counter",
+    assert_equal "local_inspector,local_inspector_counter,local_inspector_iteration",
       @view.render(:partial => "test/local_inspector", :collection => [ Customer.new("mary") ])
   end