Question

我的Organization模型有{_ 1}}到users。设置唯一性验证的正确方法是什么？

我有：

memberships

当我尝试创建会员资格时：

class Organization < ActiveRecord::Base
  has_many :memberships
end

class Membership < ActiveRecord::Base
  belongs_to :user
  belongs_to :organization
  validates_presence_of :organization_id
  validates_presence_of :user_id
  validates_uniqueness_of :user_id, :scope => :organization_id
end

class User < ActiveRecord::Base
  has_many :memberships
end

我明白了：

o = Organization.find(275)
u = User.find(505)
m = o.memberships.new(user_id: u.id)
m.save

我尝试在postgres控制台中运行确切的查询，我得到0行结果。 Membership Exists (2.0ms) SELECT 1 AS one FROM "memberships" WHERE ("memberships"."user_id" = 501 AND "memberships"."organization_id" = 275) LIMIT 1＆amp; o.memberships也显示0结果。

我唯一能想到的是u.memberships上的唯一性验证是错误的？这有什么问题？

Answer 1

m（文档：http://apidock.com/rails/ActiveRecord/Base/create/class）返回的o.memberships.create()已保存，因此下一次save来电无效

o = Organization.find(275) 
u = User.find(505)
m = o.memberships.create(user_id: u.id)
m.save

Answer 2

这里的organization_id拼写错误：

validates_uniqueness_of :user_id, :scope => :organziation_id

应该是：

validates_uniqueness_of :user_id, :scope => :organization_id

在连接表上设置唯一性验证的正确方法是什么？

2 个答案: