rescue_from accepts :with => lambda { |exception| ... } or a normal block. Closes #9827.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7822 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* rescue_from accepts :with => lambda { |exception| ... } or a normal block.  #9827 [lifofifo]
+
 * Add :status to redirect_to allowing users to choose their own response code without manually setting headers. #8297 [codahale, chasgrundy]
 
 * Add link_to :back which uses your referrer with a fallback to a javascript link. #7366 [eventualbuddha, tarmo]

actionpack/lib/action_controller/rescue.rb

@@ -71,10 +71,10 @@ module ActionController #:nodoc:
       #       exception.record.new_record? ? ...
       #     end
       # end
-      def rescue_from(*klasses)
+      def rescue_from(*klasses, &block)
         options = klasses.extract_options!
-        unless options.has_key?(:with) # allow nil
-          raise ArgumentError, "Need a handler. Supply an options hash that has a :with key as the last argument."
+        unless options.has_key?(:with)
+          block_given? ? options[:with] = block : raise(ArgumentError, "Need a handler. Supply an options hash that has a :with key as the last argument.")
         end
 
         klasses.each do |klass|
@@ -192,8 +192,11 @@ module ActionController #:nodoc:
       end
 
       def handler_for_rescue(exception)
-        if handler = rescue_handlers[exception.class.name]
+        case handler = rescue_handlers[exception.class.name]
+        when Symbol
           method(handler)
+        when Proc
+          handler.bind(self)
         end
       end
 

actionpack/test/controller/rescue_test.rb

@@ -9,9 +9,32 @@ class RescueController < ActionController::Base
   class RecordInvalid < StandardError
   end
 
+  class NotAllowed < StandardError
+  end
+
+  class InvalidRequest < StandardError
+  end
+
+  class BadGateway < StandardError
+  end
+
+  class ResourceUnavailable < StandardError
+  end
+
   rescue_from NotAuthorized, :with => :deny_access
   rescue_from RecordInvalid, :with => :show_errors
 
+  rescue_from NotAllowed, :with => proc { head :forbidden }
+  rescue_from InvalidRequest, :with => proc { |exception| render :text => exception.message }
+
+  rescue_from BadGateway do
+    head :status => 502
+  end
+
+  rescue_from ResourceUnavailable do |exception|
+    render :text => exception.message
+  end
+
   def raises
     render :text => 'already rendered'
     raise "don't panic!"
@@ -29,10 +52,26 @@ class RescueController < ActionController::Base
     raise NotAuthorized
   end
 
+  def not_allowed
+    raise NotAllowed
+  end
+
+  def invalid_request
+    raise InvalidRequest
+  end
+
   def record_invalid
     raise RecordInvalid
   end
   
+  def bad_gateway
+    raise BadGateway
+  end
+
+  def resource_unavailable
+    raise ResourceUnavailable
+  end
+
   def missing_template
   end
 
@@ -245,6 +284,26 @@ class RescueTest < Test::Unit::TestCase
     get :record_invalid
   end
 
+  def test_proc_rescue_handler
+    get :not_allowed
+    assert_response :forbidden
+  end
+
+  def test_proc_rescue_handle_with_argument
+    get :invalid_request
+    assert_equal "RescueController::InvalidRequest", @response.body
+  end
+
+  def test_block_rescue_handler
+    get :bad_gateway
+    assert_response 502
+  end
+
+  def test_block_rescue_handler_with_argument
+    get :resource_unavailable
+    assert_equal "RescueController::ResourceUnavailable", @response.body
+  end
+
   protected
     def with_all_requests_local(local = true)
       old_local, ActionController::Base.consider_all_requests_local =