Return a valid empty JSON on successful PUT and DELETE requests. [#5199 state:resolved]

Signed-off-by: José Valim <jose.valim@gmail.com>

actionpack/lib/action_controller/metal/responder.rb

@@ -161,6 +161,8 @@ module ActionController #:nodoc:
         display resource.errors, :status => :unprocessable_entity
       elsif post?
         display resource, :status => :created, :location => api_location
+      elsif has_empty_resource_definition?
+        display empty_resource, :status => :ok
       else
         head :ok
       end
@@ -221,5 +223,23 @@ module ActionController #:nodoc:
     def default_action
       @action ||= ACTIONS_FOR_VERBS[request.request_method_symbol]
     end
+
+    # Check whether resource needs a specific definition of empty resource to be valid
+    #
+    def has_empty_resource_definition?
+      respond_to?("empty_#{format}_resource")
+    end
+
+    # Delegate to proper empty resource method
+    #
+    def empty_resource
+      send("empty_#{format}_resource")
+    end
+
+    # Return a valid empty JSON resource
+    #
+    def empty_json_resource
+      "{}"
+    end
   end
 end

actionpack/test/controller/mime_responds_test.rb

@@ -709,6 +709,15 @@ class RespondWithControllerTest < ActionController::TestCase
     assert_equal " ", @response.body
   end
 
+  def test_using_resource_for_put_with_json_yields_ok_on_success
+    Customer.any_instance.stubs(:to_json).returns('{"name": "David"}')
+    @request.accept = "application/json"
+    put :using_resource
+    assert_equal "application/json", @response.content_type
+    assert_equal 200, @response.status
+    assert_equal "{}", @response.body
+  end
+
   def test_using_resource_for_put_with_xml_yields_unprocessable_entity_on_failure
     @request.accept = "application/xml"
     errors = { :name => :invalid }
@@ -739,6 +748,16 @@ class RespondWithControllerTest < ActionController::TestCase
     assert_equal " ", @response.body
   end
 
+  def test_using_resource_for_delete_with_json_yields_ok_on_success
+    Customer.any_instance.stubs(:to_json).returns('{"name": "David"}')
+    Customer.any_instance.stubs(:destroyed?).returns(true)
+    @request.accept = "application/json"
+    delete :using_resource
+    assert_equal "application/json", @response.content_type
+    assert_equal 200, @response.status
+    assert_equal "{}", @response.body
+  end
+
   def test_using_resource_for_delete_with_html_redirects_on_failure
     with_test_route_set do
       errors = { :name => :invalid }