1 files changed, 41 insertions, 11 deletions

diff --git a/actionpack/lib/action_controller/abstract/base.rb b/actionpack/lib/action_controller/abstract/base.rb
index ab9aed0b26..1f2f096dae 100644
--- a/actionpack/lib/action_controller/abstract/base.rb
+++ b/actionpack/lib/action_controller/abstract/base.rb
@@ -1,4 +1,16 @@
+require 'active_support/core_ext/module/attr_internal'
+
 module AbstractController
+  class Error < StandardError; end
+  
+  class DoubleRenderError < Error
+    DEFAULT_MESSAGE = "Render and/or redirect were called multiple times in this action. Please note that you may only call render OR redirect, and at most once per action. Also note that neither redirect nor render terminate execution of the action, so if you want to exit an action after redirecting, you need to do something like \"redirect_to(...) and return\"."
+
+    def initialize(message = nil)
+      super(message || DEFAULT_MESSAGE)
+    end
+  end  
+  
   class Base
     
     attr_internal :response_body
@@ -13,6 +25,15 @@ module AbstractController
       end
       
       alias_method :abstract?, :abstract
+
+      def inherited(klass)
+        ::AbstractController::Base.subclasses << klass.to_s
+        super
+      end
+
+      def subclasses
+        @subclasses ||= []
+      end
       
       def internal_methods
         controller = self
@@ -48,12 +69,13 @@ module AbstractController
     end
     
     def process(action_name)
-      unless respond_to_action?(action_name)
+      @_action_name = action_name = action_name.to_s
+
+      unless action_name = method_for_action(action_name)
         raise ActionNotFound, "The action '#{action_name}' could not be found"
       end
-      
-      @_action_name = action_name
-      process_action
+
+      process_action(action_name)
       self
     end
     
@@ -63,23 +85,31 @@ module AbstractController
       self.class.action_methods
     end
   
+    def action_method?(action)
+      action_methods.include?(action)
+    end
+  
     # It is possible for respond_to?(action_name) to be false and
     # respond_to?(:action_missing) to be false if respond_to_action?
     # is overridden in a subclass. For instance, ActionController::Base
     # overrides it to include the case where a template matching the
     # action_name is found.
-    def process_action
-      if respond_to?(action_name) then send(action_name)
-      elsif respond_to?(:action_missing, true) then action_missing(action_name)
-      end
+    def process_action(method_name)
+      send(method_name)
     end
-    
+
+    def _handle_action_missing
+      action_missing(@_action_name)
+    end
+
     # Override this to change the conditions that will raise an
     # ActionNotFound error. If you accept a difference case,
     # you must handle it by also overriding process_action and
     # handling the case.
-    def respond_to_action?(action_name)
-      action_methods.include?(action_name) || respond_to?(:action_missing, true)
+    def method_for_action(action_name)
+      if action_method?(action_name) then action_name
+      elsif respond_to?(:action_missing, true) then "_handle_action_missing"
+      end
     end
   end
 end
\ No newline at end of file