def model_ivar_get(plural = false)
      name = ivar_name(model_class)
      name = name.pluralize if plural
      name = :"@#{name}"
      instance_variable_get(name) if instance_variable_defined?(name)
    end
def model_ivar_get(plural = false)
      name = ivar_name(model_class)
      name = name.pluralize if plural
      name = :"@#{name}"
      instance_variable_get(name) if instance_variable_defined?(name)
    end
Get the instance variable named after the +model_class+.
 If the collection variable is required, pass true as the second argument.