Question

我正在使用MongoDB在应用程序中构建一个简单的票证系统。有一次，我能够创建门票，但现在我不是。用户模型如下：

class User
  include Mongoid::Document
  include Mongoid::Timestamps::Updated

  has_many :initiated_tickets, :class_name => 'Ticket', :inverse_of => :initiator
  has_many :assigned_tickets,  :class_name => 'Ticket', :inverse_of => :assignee

Ticket模型如下：

class Ticket
  include Mongoid::Document
  include Mongoid::Timestamps::Updated

  field :name
  field :initiator_email
  field :assignee_email
  field :comment


  belongs_to :alert
  has_one :initiator,   :class_name => 'User', :inverse_of => :initiated_tickets
  belongs_to :assignee, :class_name => 'User', :inverse_of => :assigned_tickets

当我尝试创建一张票时，我收到来自Mongoid的错误声明：

Mongoid::Errors::InverseNotFound: 
Problem:
  When adding a(n) User to Ticket#initiator, Mongoid could not determine the inverse foreign key to set. The attempted key was 'initiated_tickets_id'.

我不确定这里出了什么问题。看起来两个都正确设置了inverse_of。知道为什么这不起作用，以前是什么时候？谢谢！

Answer 1

您只需在inverse_of方面定义belongs_to即可。然而，has_many方应定义foreign_key。我有完全相同的关系，如下：

class User
    has_many :initiated_tickets, foreign_key: "initiator_id", class_name: "Ticket"
    has_many :assigned_tickets, foreign_key: "assignee_id", class_name: "Ticket"

class Ticket
    field :initiator_id, :type => String
    field :assignee_id, :type => String
    belongs_to :initiator, inverse_of: "initiated_tickets" class_name: "User"
    belongs_to :assignee, inverse_of: "assigned_tickets" class_name: "User"

修改

重写了我的答案，因为我原来错了。

Mongoid无法确定要设置的反向外键

1 个答案: