使属性仅在创建期间可批量分配 [英] Make attributes mass assignable only during creation

问题描述

在创建模型对象的过程中，是否可以有一个只能批量赋值的属性?

Is it possible to have an attribute that is only mass-assignable during the creation of a model object?

例如，username 属性在创建对象时应该是可批量分配的，但之后不能(它应该是只读的).

For example, the username attribute should be mass-assignable when creating the object, but not after that (it should be read-only).

推荐答案

这就是 attr_readonly 所做的:

class User < ActiveRecord::Base
  attr_readonly :username
end

u = User.create(:username => 'dude')
u.username # => 'dude'

u.update_attributes(:username => 'dudette')
u.reload.username # => 'dude'

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