only try to display an api template in responders if the request is a get or there are no errors

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

actionpack/lib/action_controller/metal/responder.rb

@@ -131,7 +131,11 @@ module ActionController #:nodoc:
     # responds to :to_format and display it.
     #
     def to_format
-      default_render
+      if get? || !has_errors?
+        default_render
+      else
+        display_errors
+      end
     rescue ActionView::MissingTemplate => e
       api_behavior(e)
     end
@@ -155,9 +159,6 @@ module ActionController #:nodoc:
 
       if get?
         display resource
-      elsif has_errors?
-        # bypass the options merging of display
-        controller.render format => resource.errors, :status => :unprocessable_entity
       elsif post?
         display resource, :status => :created, :location => api_location
       elsif has_empty_resource_definition?
@@ -210,6 +211,10 @@ module ActionController #:nodoc:
       controller.render given_options.merge!(options).merge!(format => resource)
     end
 
+    def display_errors
+      controller.render format => resource.errors, :status => :unprocessable_entity
+    end
+
     # Check whether the resource has errors.
     #
     def has_errors?

actionpack/test/controller/mime_responds_test.rb

@@ -558,6 +558,10 @@ class RespondWithController < ActionController::Base
     respond_with(resource, :location => "http://test.host/", :status => :created)
   end
 
+  def using_invalid_resource_with_template
+    respond_with(resource)
+  end
+
   def using_resource_with_responder
     responder = proc { |c, r, o| c.render :text => "Resource name is #{r.first.name}" }
     respond_with(resource, :responder => responder)
@@ -970,6 +974,23 @@ class RespondWithControllerTest < ActionController::TestCase
     assert_equal nil, @response.location
   end
 
+  def test_using_invalid_resource_with_template
+    errors = { :name => :invalid }
+    Customer.any_instance.stubs(:errors).returns(errors)
+
+    @request.accept = "text/xml"
+
+    post :using_invalid_resource_with_template
+    assert_equal errors.to_xml, @response.body
+    assert_equal 422, @response.status
+    assert_equal nil, @response.location
+
+    put :using_invalid_resource_with_template
+    assert_equal errors.to_xml, @response.body
+    assert_equal 422, @response.status
+    assert_equal nil, @response.location
+  end
+
   def test_using_resource_with_responder
     get :using_resource_with_responder
     assert_equal "Resource name is david", @response.body

actionpack/test/fixtures/respond_with/using_invalid_resource_with_template.xml.erb

@@ -0,0 +1 @@
+<content>I should not be displayed</content>