Added that Array#to_param calls to_param on all it's elements (closes #10473) [brandon]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8384 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

 *SVN*
 
+* Added that Array#to_param calls to_param on all it's elements #10473 [brandon]
+
 * Ensure asset cache directories are automatically created.  #10337 [Josh Peek, Chu Yeow]
 
 * render :xml and :json preserve custom content types.  #10388 [jmettraux, Chu Yeow]

activesupport/lib/active_support/core_ext/array/conversions.rb

@@ -24,9 +24,9 @@ def to_sentence(options = {})
           end
         end
 
-        # When an array is given to url_for, it is converted to a slash separated string.
+        # Calls to_param on all its elements and joins the result with slashes. This is used by url_for in Action Pack. 
         def to_param
-          join '/'
+          map(&:to_param).join '/'
         end
 
         # Converts an array into a string suitable for use as a URL query string, using the given <tt>key</tt> as the

activesupport/test/core_ext/array_ext_test.rb

@@ -16,6 +16,12 @@ def test_to
 end
 
 class ArrayExtToParamTests < Test::Unit::TestCase
+  class ToParam < String
+    def to_param
+      "#{self}1"
+    end
+  end
+  
   def test_string_array
     assert_equal '', %w().to_param
     assert_equal 'hello/world', %w(hello world).to_param
@@ -25,6 +31,10 @@ def test_string_array
   def test_number_array
     assert_equal '10/20', [10, 20].to_param
   end
+  
+  def test_to_param_array
+    assert_equal 'custom1/param1', [ToParam.new('custom'), ToParam.new('param')].to_param
+  end
 end
 
 class ArrayExtToSentenceTests < Test::Unit::TestCase