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@@ -1,5 +1,7 @@
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 *SVN*
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+* Fix nested parameter hash parsing bug.  #10797 [thomas.lee]
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+
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 * Allow using named routes in ActionController::TestCase before any request has been made. Closes #11273 [alloy]
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 * Fixed that sweepers defined by cache_sweeper will be added regardless of the perform_caching setting. Instead, control whether the sweeper should be run with the perform_caching setting. This makes testing easier when you want to turn perform_caching on/off [DHH]

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@@ -674,6 +674,7 @@
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             else
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               top << {key => value}.with_indifferent_access
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               push top.last
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+              value = top[key]
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             end
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           else
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             top << value

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@@ -705,6 +705,12 @@
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     expected = { "test2" => "value1" }
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     assert_equal expected, ActionController::AbstractRequest.parse_request_parameters(input)
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   end
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+
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+  def test_parse_params_with_array_prefix_and_hashes
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+    input = { "a[][b][c]" => %w(d) }
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+    expected = {"a" => [{"b" => {"c" => "d"}}]}
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+    assert_equal expected, ActionController::AbstractRequest.parse_request_parameters(input)
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+  end
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 end
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