Serializing the errors hash in ActiveModel::Serializer

Question

I\'m using ActiveModel::Serializer to customize the JSON responses for my API. This works fine in most cases, except when it fails to save a model successfully.

For exa

Answer 1

The ErrorsSerializer doesn't work because of how responders create json response for errors:

def json_resource_errors
  { errors: resource.errors }
end

(rails < 4.2 https://github.com/rails/rails/blob/4-1-stable/actionpack/lib/action_controller/metal/responder.rb#L290 for newer rails, responders have been extracted to https://github.com/plataformatec/responders/blob/master/lib/action_controller/responder.rb#L288)

one way of dealing with this is to override this method for responders. Put this code in your config initializers:

# config/initializers/action_controller_responder.rb
module ActionController
  class Responder
    def json_resource_errors
      resource.errors
    end
  end
end

Then your serializer will work for resource errors.