ruby-on-rails - Rails 4. 一个模型中有两个外键

Question

我有两个模型:

#帐户迁移

create_table :accounts do |t|
  t.string :email
  t.string :password

  t.timestamps
end

#ProjectInvitations 迁移

create_table :project_invitations do |t|t
  t.integer :sender_account_id #belongs_to :account
  t.string :recipient_first_name
  t.string :recipient_last_name
  t.string :recipient_email_string
  t.integer :recipient_account_id #belongs_to :account
  t.string :status

  t.timestamps
end

如何通过外键 sender_account_id 和 recipient_account_id 添加与模型帐户的关系？

Answer 1

class ProjectInvitation < ActiveRecord::Base

  belongs_to :sender,    class_name: Account, foreign_key: :sender_account_id
  belongs_to :recipient, class_name: Account, foreign_key: :recipient_account_id
end

class Account < ActiveRecord::Base
  has_many: :sent_invitations,     class_name: ProjectInvitation, foreign_key: :sender_account_id
  has_many: :received_invitations, class_name: ProjectInvitation, foreign_key: :recipient_account_id
end