通过关联创建 ActiveRecord has_one

Question

鉴于下面的 ActiveRecord 模型和关联，我需要在帐户模型上添加一个 has_one :owner 关联以引用其account_user 角色设置为“所有者”的用户。

AccountUser 模型具有角色属性

class AccountUser < ApplicationRecord
  enum role: [:user, :admin, :owner]

  belongs_to :account
  belongs_to :user
end

帐户模型通过帐户用户拥有许多用户。

class Account < ApplicationRecord
  has_many :account_users
  has_many :users, through: :account_users
  has_one  :owner, -> { where(role: :owner) } #, correct options here.
end

用户模型通过账户用户拥有多个账户

class User < ApplicationRecord
  has_many :account_users
  has_many :accounts, through: :account_users
end

Answer 1

尝试做一个中间关联account_owner：

class Account < ApplicationRecord
  has_many :account_users
  has_many :users, through: :account_users

  has_one :account_owner, -> { where(role: :owner) }, class_name: 'AccountUser'
  has_one :owner, through: :account_owner, source: :user
end