Rails 3.1 限制用户创建的对象 [英] Rails 3.1 limit user created objects

问题描述

我想限制用户可以创建的模型对象的数量.我已经尝试了以下但它不起作用.我知道 rails 3.1 中发生了一些变化，现在不知道如何实现.

I would like to limit the number of model Objects a user can create. I've tried the below but it is not working. I understand some changes have happened in rails 3.1 and not sure how to accomplish this now.

class User < ActiveRecord::Base
  has_many :things, :limit => 5, :dependent => :destroy # This doesn't work
end

class Things <ActiveRecord::Base
  belongs_to :user
end

推荐答案

试试这个:

class User < ActiveRecord::Base
  has_many :things
end

class Things <ActiveRecord::Base
  belongs_to :user
  validate :thing_count_within_limit, :on => :create

  def thing_count_within_limit
    if self.user.things(:reload).count >= 5
      errors.add(:base, "Exceeded thing limit")
    end
  end
end

编辑:针对 Rails 3 进行了更新

Edit: updated for Rails 3

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