Rails 关联：同一模型出现 2 次

Question

我有一个 Consultation 模型，它有一个 post_consultant 和一个 consultant。 post_consultant 和 consultant 都是对 Employee 模型的引用。所以你可以说：

型号

Class Consultation < ActiveRecord::Base
    has_one :employee # for consultant
    has_one :employee # for post_consultant
end

迁移

create_table "consultations", force: :cascade do |t|
  t.boolean "showed_up"
  t.boolean "signed_up"
  t.integer "client_id"
  t.integer "consultant_id"
  t.integer "post_consultant_id"
end

我该怎么写？

正确的型号：

class Consultation < ActiveRecord::Base
    belongs_to :consultant, class_name: "Employee", foreign_key: "consultant_id"
    belongs_to :post_consultant, class_name: "Employee", foreign_key: "post_consultant_id"
end

Answer 1

Class Consultation < ActiveRecord::Base
    belongs_to :consultant, :class_name => "Employee", :foreign_key=> "consultant_id", dependent: :destroy
    belongs_to :post_consultant, :class_name=>"Employee", :foreign_key=> "post_consultant_id", dependent: :destroy
end

Answer 2

您可以定义引用同一模型的多个关系。

Class Consultation < ActiveRecord::Base
    has_one :consultant, class_name: 'Employee', foreign_key: :consultant_id
    has_one :post_consultant, class_name: 'Employee', foreign_key: :post_consultant_id
end

注意：使用上述语法提及您为每个关联使用的外键。

Rails 关联：同一模型出现 2 次

Rails Association: 2 occurrences of same model

activerecord

ruby-on-rails

associations