What does model.create! mean when used in a Rails controller concern?

Question

What does the model.create! expression mean:

module StandardCreateAction
  extend ActiveSupport::Concern

  def create
   model.create!(attributes)
   render text: 'SUCCESS', status: self.class::SUCCESS_STATUS
  end
end

I'm guessing it calls a same name model in the controller that uses this mixin?

Answer 1

In this case model has nothing to do with ActiveSupport::Concern which is just syntactic sugar around common ruby idioms such as:

module SomeMixin
  def self.included(base)
    base.extend ClassMethods
    base.class_eval do
      def foo
      end
    end
  end

  module ClassMethods
    def bar
    end
  end
end

In this specific casemodel would be resolved to self.model in the class which includes or is extended by the module. If self.model cannot be resolved there it goes up the class tree.

I'm guessing its something along these lines:

def model
  self.class_name.chomp("Controller").singularize.constantize
end

However, you might want to to a look at ActionController::Responder and the responders gem before you go reinventing the wheel.