Ruby on rails Mongoid can'；t保存具有“属于/有多个”关系的文档。循环依赖
我有两个Mongoid类：Ruby on rails Mongoid can'；t保存具有“属于/有多个”关系的文档。循环依赖,ruby-on-rails,ruby,mongoid,mongoid5,Ruby On Rails,Ruby,Mongoid,Mongoid5,我有两个Mongoid类： class Reservation include Mongoid::Document belongs_to :listing, class_name: 'Listing', inverse_of: 'Reservation' end class Listing include Mongoid::Document has_many :reservations, class_name: 'Reservation', foreign_key: :list
class Reservation
include Mongoid::Document
belongs_to :listing, class_name: 'Listing', inverse_of: 'Reservation'
end
class Listing
include Mongoid::Document
has_many :reservations, class_name: 'Reservation', foreign_key: :listing_id
end
\u id\save找到列表它，没有引发错误
listing = Listing.find(...)
listing.save! #=> true
然后我初始化一个新的预订对象：
reservation = Reservation.find_or_initialize_by(params)
reservation.save! #=> error, exptected though, because I didn't set the listing_id yet
Mongoid::Errors::Validations:
message:
Validation of Reservation failed.
summary:
The following errors were found: Listing can't be blank
resolution:
Try persisting the document with valid data or remove the validations.
from /home/ec2-user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/bundler/gems/mongoid-71c29a805990/lib/mongoid/persistable.rb:78:in `fail_due_to_validation!'
因此，我将先前列表的id分配给预订：
reservation.listing_id = listing._id
reservation.listing_id #=> nil
我甚至不能分配列表id字段
reservation.listing #=> returns the associated document no problem though..
reservation.listing.save! #=> error
Mongoid::Errors::Validations:
message:
Validation of Listing failed.
summary:
The following errors were found: Reservations is invalid
resolution:
Try persisting the document with valid data or remove the validations.
from /home/ec2-user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/bundler/gems/mongoid-71c29a805990/lib/mongoid/persistable.rb:78:in `fail_due_to_validation!'
在没有有效列表的情况下无法保存预订，
没有有效的保留，无法保存列表
这是什么
请保存我的一天…您实际上必须在inverse\u中指定反向字段，因此请尝试以下操作：
class Reservation
include Mongoid::Document
belongs_to :listing, class_name: 'Listing', inverse_of: :reservations
end
class Listing
include Mongoid::Document
has_many :reservations, class_name: 'Reservation', inverse_of :listing
end
我还将外键
替换为的逆键
，因为has\u-many关系更容易让Mongoid猜测外键名：）
然后，检查您指定的验证，您没有包括在您的帖子中，但是如果您首先创建一个列表，您应该能够为它创建一个预订，而不会有任何问题
此外，直接将对象分配给对象也很好，而且通常更容易，因此您可以直接编写reservation.listing=my_listing
您实际上必须在inverse\u of
中指定反向字段，因此请尝试以下操作：
class Reservation
include Mongoid::Document
belongs_to :listing, class_name: 'Listing', inverse_of: :reservations
end
class Listing
include Mongoid::Document
has_many :reservations, class_name: 'Reservation', inverse_of :listing
end
我还将外键
替换为的逆键
，因为has\u-many关系更容易让Mongoid猜测外键名：）
然后，检查您指定的验证，您没有包括在您的帖子中，但是如果您首先创建一个列表，您应该能够为它创建一个预订，而不会有任何问题
另外，直接将对象分配给对象也很好，而且通常更容易，因此您可以直接编写reservation.listing=my_listing
谢谢！我能按照你的解决办法解决我的问题。但我确实犯了一个愚蠢的错误，也需要纠正。我正在使用elasticsearch，我定义了一个用于索引的#listing_id
instance_方法。这与协会的#listing_id
方法相冲突。。不过我还是解决了<代码>列表_id#listing_id#listing_id