Sql 联接表中的重复行有三个：通过关联 描述

我有四种型号：

使用者

组织机构

角色

组织用户角色

其思想是，一个用户可以属于多个组织，可以有多个角色，但每个组织只有一个

我的模型是这样的：

user.rb

class User < ActiveRecord::Base
  has_many :roles, :through => :organization_user_roles
  has_many :organizations, :through => :organization_user_roles
  has_many :organization_user_roles
end

class OrganizationUserRole < ActiveRecord::Base
  has_many :organization_user_roles  
  has_many :users, :through => :organization_user_roles
  has_many :roles, :through => :organization_user_roles
end

class Role < ActiveRecord::Base

end

class OrganizationUserRole < ActiveRecord::Base
  belongs_to :user
  belongs_to :organization
  belongs_to :role
end

class用户：组织\u用户\u角色
拥有多个：组织，：通过=>:organization\u user\u角色
拥有多个：组织、用户、角色
结束

organization.rb

class User < ActiveRecord::Base
  has_many :roles, :through => :organization_user_roles
  has_many :organizations, :through => :organization_user_roles
  has_many :organization_user_roles
end

class OrganizationUserRole < ActiveRecord::Base
  has_many :organization_user_roles  
  has_many :users, :through => :organization_user_roles
  has_many :roles, :through => :organization_user_roles
end

class Role < ActiveRecord::Base

end

class OrganizationUserRole < ActiveRecord::Base
  belongs_to :user
  belongs_to :organization
  belongs_to :role
end

class OrganizationUserRole：组织\u用户\u角色
有多个：角色，：到=>：组织\u用户\u角色
结束

角色.rb

class User < ActiveRecord::Base
  has_many :roles, :through => :organization_user_roles
  has_many :organizations, :through => :organization_user_roles
  has_many :organization_user_roles
end

class OrganizationUserRole < ActiveRecord::Base
  has_many :organization_user_roles  
  has_many :users, :through => :organization_user_roles
  has_many :roles, :through => :organization_user_roles
end

class Role < ActiveRecord::Base

end

class OrganizationUserRole < ActiveRecord::Base
  belongs_to :user
  belongs_to :organization
  belongs_to :role
end

类角色

组织\用户\角色.rb

class User < ActiveRecord::Base
  has_many :roles, :through => :organization_user_roles
  has_many :organizations, :through => :organization_user_roles
  has_many :organization_user_roles
end

class OrganizationUserRole < ActiveRecord::Base
  has_many :organization_user_roles  
  has_many :users, :through => :organization_user_roles
  has_many :roles, :through => :organization_user_roles
end

class Role < ActiveRecord::Base

end

class OrganizationUserRole < ActiveRecord::Base
  belongs_to :user
  belongs_to :organization
  belongs_to :role
end

class OrganizationUserRole

我正在为我的db播种以下种子。rb

require 'faker'

# seed with standard roles

role_list = [
  [ "superadmin" ],
  [ "admin" ], 
  [ "user" ],
  [ "owner" ],
]

role_list.each do |role|
  Role.create( :name => role[0] )
end

# create default superadmin & organization

p = User.create(email: 'thomas@aquarterit.com', password: 'password')
o = Organization.create(name: 'A Quarter IT', website: 'www.aquarterit.com')
o.users << User.find_by_email('thomas@aquarterit.com')
p.roles << Role.find_by_name("superadmin")

# 30 organizations, 3 users each

30.times do |organization|
  o = Organization.create(name: Faker::Company.name, website: Faker::Internet.domain_name)
  3.times do |user|
    p = User.create(email: Faker::Internet.email, password: 'password')
    p.roles << Role.find_by_name("user")
    o.users << User.last
  end
end

require'faker'
#标准角色的种子
角色列表=[
[“超级管理员”]，
[“管理”]，
[“用户”]，
[“所有者”]，
]
角色列表。每个do |角色|
创建（：name=>角色[0]）
结束
#创建默认超级管理员和组织
p=用户。创建（电子邮件：'thomas@aquarterit.com，密码：'password'）
o=组织。创建（名称：“四分之一IT”，网站：“www.aquarterit.com”）
o、 用户您需要为三个参数添加一个数据库唯一键，如

add_index "organization_user_roles", ["user_id", "organization_id", "role_id"], name: "unique_roles", unique: true, using: :btree

然后在您的组织中\u用户\u角色模型

validates_uniqueness_of :role_id, scope: [:user_id, :organization_id]

我做了一个类似的应用程序，在我的数据库中有唯一的列，这个解决方案很有效，你需要3个表，请查看以下链接：

我最后按照这里的说明进行了操作：


它就像一个符咒