Rails 将验证放入模块 mixin 中? [英] Rails put validation in a module mixin?

问题描述

某些验证在我的模型中是重复的:

Some validations are repetitive in my models:

validates :name, :length => { :minimum => 2 }, :presence => true, :uniqueness => true
validates :name_seo, :length => { :minimum => 2 }, :presence => true, :uniqueness => true

我如何将它放入 mixin 中?如果我只是把它们放在一个 mixin 中，我就会得到这个错误

How would I put that in a mixin? I get this error if I just put 'em in a mixin

app/models/validations.rb:5: undefined method `validates' for Validations:Module (NoMethodError)

推荐答案

module Validations
  extend ActiveSupport::Concern

  included do
    validates :name, :length => { :minimum => 2 }, :presence => true, :uniqueness => true
    validates :name_seo, :length => { :minimum => 2 }, :presence => true, :uniqueness => true
  end
end

validates 宏必须在包含器的上下文中进行评估，而不是在模块的上下文中(就像您可能正在做的那样).

The validates macro must be evaluated in the context of the includer, not of the module (like you probably were doing).

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