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@@ -147,6 +147,15 @@ module ActionController
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             end
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           }, __FILE__, __LINE__
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         end
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+
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+        def clear_recognize_optimized!
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+          instance_eval %{
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+            def recognize_optimized(path, environment)
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+              write_recognize_optimized!
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+              recognize_optimized(path, environment)
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+            end
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+          }, __FILE__, __LINE__
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+        end
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     end
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   end
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 end

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@@ -195,7 +195,7 @@ module ActionController
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         self.routes = []
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         self.named_routes = NamedRouteCollection.new
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-        write_recognize_optimized!
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+        clear_recognize_optimized!
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       end
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       # Subclasses and plugins may override this method to specify a different
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@@ -217,7 +217,7 @@ module ActionController
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         @routes_by_controller = nil
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         # This will force routing/recognition_optimization.rb
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         # to refresh optimisations.
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-        @compiled_recognize_optimized = nil
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+        clear_recognize_optimized!
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       end
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       def install_helpers(destinations = [ActionController::Base, ActionView::Base], regenerate_code = false)

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@@ -1375,6 +1375,36 @@ uses_mocha 'LegacyRouteSet, Route, RouteSet and RouteLoading' do
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         x.send(:foo_with_requirement_url, "I am Against the requirements")
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       end
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     end
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+
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+    def test_routes_changed_correctly_after_clear
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+      ActionController::Base.optimise_named_routes = true
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+      rs = ::ActionController::Routing::RouteSet.new
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+      rs.draw do |r|
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+        r.connect 'ca', :controller => 'ca', :action => "aa"
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+        r.connect 'cb', :controller => 'cb', :action => "ab"
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+        r.connect 'cc', :controller => 'cc', :action => "ac"
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+        r.connect ':controller/:action/:id'
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+        r.connect ':controller/:action/:id.:format'
0
+      end
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+
0
+      hash = rs.recognize_path "/cc"
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+
0
+      assert_not_nil hash
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+      assert_equal %w(cc ac), [hash[:controller], hash[:action]]
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+
0
+      rs.draw do |r|
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+        r.connect 'cb', :controller => 'cb', :action => "ab"
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+        r.connect 'cc', :controller => 'cc', :action => "ac"
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+        r.connect ':controller/:action/:id'
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+        r.connect ':controller/:action/:id.:format'
0
+      end
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+
0
+      hash = rs.recognize_path "/cc"
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+
0
+      assert_not_nil hash
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+      assert_equal %w(cc ac), [hash[:controller], hash[:action]]
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+
0
+    end
0
   end
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   class RouteTest < Test::Unit::TestCase