ruby has class scope not method scope, correct?

So in this class, for example:

class RestfulController
def extract_resource_model
    resource_model_name
    resource_model
  end
 
  def resource_model_name
    #@resource_model_name ||= self.class.resource_model_name || controller_name.singularize
    @resource_model_name ||= controller_name.singularize
   
  end
 
  def resource_model
    @resource_model ||= Kernel.const_get(@resource_model_name.camelize)
  end
 
end

when resource_model_name is called, resource_model_name returns an instance variable @resource_model_name as part of the return value in extract_resource_model method. Now that instance variable @resource_model_name is available throughout all the instance methods in that class, correct?  That's why I am able to access it without any problems with scope resolution in resource_model, correct?

Thanks for response.