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@@ -1,5 +1,7 @@
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 *2.2.1 [RC2 or 2.2 final]*
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+* Fixed that polymorphic_url should compact given array #1317 [hiroshi]
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+
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 * Fixed the sanitize helper to avoid double escaping already properly escaped entities #683 [antonmos/Ryan McGeary]
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 * Fixed that FormTagHelper generated illegal html if name contained square brackets #1238 [Vladimir Dobriakov]

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@@ -73,7 +73,7 @@ module ActionController
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     #
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     def polymorphic_url(record_or_hash_or_array, options = {})
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       if record_or_hash_or_array.kind_of?(Array)
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-        record_or_hash_or_array = record_or_hash_or_array.dup
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+        record_or_hash_or_array = record_or_hash_or_array.compact
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       end
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       record    = extract_record(record_or_hash_or_array)

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@@ -169,6 +169,17 @@ uses_mocha 'polymorphic URL helpers' do
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       polymorphic_url([@article, :response, @tag], :format => :pdf)
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     end
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+    def test_nesting_with_array_containing_nil
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+      expects(:article_response_url).with(@article)
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+      polymorphic_url([@article, nil, :response])
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+    end
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+
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+    def test_with_array_containing_single_object
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+      @article.save
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+      expects(:article_url).with(@article)
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+      polymorphic_url([nil, @article])
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+    end
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+
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     # TODO: Needs to be updated to correctly know about whether the object is in a hash or not
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     def xtest_with_hash
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       expects(:article_url).with(@article)