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@@ -1,5 +1,7 @@
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 *1.12.1* (April 6th, 2005)
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+* Fixed that template extensions would be cached development mode #4624 [Stefan Kaes]
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+
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 * Update to Prototype 1.5.0_rc0 [Sam Stephenson]
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 * Honor skipping filters conditionally for only certain actions even when the parent class sets that filter to conditionally be executed only for the same actions. #4522 [Marcel Molina Jr.]

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@@ -157,6 +157,11 @@ module ActionView #:nodoc:
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     @@cache_template_loading = false
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     cattr_accessor :cache_template_loading
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+    # Specify whether file extension lookup should be cached.
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+    # Should be +false+ for development environments. Defaults to +true+.
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+    @@cache_template_extensions = true
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+    cattr_accessor :cache_template_extensions
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+
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     # Specify whether local_assigns should be able to use string keys.
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     # Defaults to +true+. String keys are deprecated and will be removed
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     # shortly.
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@@ -312,15 +317,11 @@ module ActionView #:nodoc:
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     end
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     def pick_template_extension(template_path)#:nodoc:
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-      @@cached_template_extension[template_path] ||=
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-        if match = delegate_template_exists?(template_path)
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-          match.first.to_sym
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-        elsif erb_template_exists?(template_path):        :rhtml
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-        elsif builder_template_exists?(template_path):    :rxml
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-        elsif javascript_template_exists?(template_path): :rjs
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-        else
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-          raise ActionViewError, "No rhtml, rxml, rjs or delegate template found for #{template_path}"
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-        end
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+      if @@cache_template_extensions
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+        @@cached_template_extension[template_path] ||= find_template_extension_for(template_path)
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+      else
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+        find_template_extension_for(template_path)
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+      end
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     end
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     def delegate_template_exists?(template_path)#:nodoc:
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@@ -345,7 +346,7 @@ module ActionView #:nodoc:
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       if template_file_extension
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         template_exists?(template_file_name, template_file_extension)
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       else
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-        @@cached_template_extension[template_path] ||
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+        cached_template_extension(template_path) ||
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            %w(erb builder javascript delegate).any? do |template_type| 
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              send("#{template_type}_template_exists?", template_path)
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            end
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@@ -371,6 +372,21 @@ module ActionView #:nodoc:
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         template_path_without_extension = template_path.sub(/\.(\w+)$/, '')
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         [ template_path_without_extension, $1 ]
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       end
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+      
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+      def cached_template_extension(template_path)
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+        @@cache_template_extensions && @@cached_template_extension[template_path]
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+      end      
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+          
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+      def find_template_extension_for(template_path)
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+        if match = delegate_template_exists?(template_path)
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+          match.first.to_sym
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+        elsif erb_template_exists?(template_path):        :rhtml
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+        elsif builder_template_exists?(template_path):    :rxml
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+        elsif javascript_template_exists?(template_path): :rjs
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+        else
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+          raise ActionViewError, "No rhtml, rxml, rjs or delegate template found for #{template_path}"
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+        end
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+      end
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       # This method reads a template file.
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       def read_template_file(template_path, extension)

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@@ -14,6 +14,7 @@ config.breakpoint_server = true
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 # Show full error reports and disable caching
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 config.action_controller.consider_all_requests_local = true
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 config.action_controller.perform_caching             = false
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+config.action_view.cache_template_extensions         = false
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 config.action_view.debug_rjs                         = true
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 # Don't care if the mailer can't send