NoMethodError：私人方法`exists_check'要求类

我有一个很奇怪的问题。NoMethodError：私人方法`exists_check'要求类

场景：我正在使用MongoDB（mongoid gem）在Rails中处理照片的集合，其中每张照片都属于相册。一些mongo字段由关注点提供，模型的名称空间正确。所以，

关注：MediaConcerns::Base

module MediaConcerns 
    module Base 
    extend ActiveSupport::Concern 

    included do 
     field :photo_description, type: String 
    end 
    end 
end

关注：MediaCollectionConcerns::Base

module MediaCollectionConcerns 
    module Base 
    extend ActiveSupport::Concern 

    included do 
     field :album_title, type: String 
     field :album_description, type: String 
    end 
    end 
end

而且MediaType::Photo是：

module MediaType 
    class Photo 
    include Mongoid::Document 
    include Mongoid::Timestamps::Short 
    include MediaConcerns::Base 

    embedded_in :photo_album, class_name: 'MediaCollection::PhotoAlbum'  
    end 
end

虽然MediaCollection::PhotoAlbum是：

module MediaCollection 
    class PhotoAlbum 
    include Mongoid::Document 
    include Mongoid::Timestamps::Short 
    include MediaCollectionConcerns::Base 

    embeds_many :photos, class_name: 'MediaType::Photo' 
    end 
end

担心与否，问题仍然存在，并且与embedded_in和embeds_many有关。

通过Rails的控制台，当我尝试MediaCollection::PhotoAlbum.new它给：

NoMethodError: private method `existence_check' called for MediaCollection::PhotoAlbum:Class 
from /home/marco/.rvm/gems/ruby-2.4.0/gems/mongoid-6.1.0/lib/mongoid/relations/macros.rb:355:in `relate' 
from /home/marco/.rvm/gems/ruby-2.4.0/gems/mongoid-6.1.0/lib/mongoid/relations/macros.rb:85:in `embeds_many' 
from /home/marco/workspace/backend/app/models/media_collection/photo_album.rb:10:in `<class:PhotoAlbum>' 
from /home/marco/workspace/backend/app/models/media_collection/photo_album.rb:2:in `<module:MediaCollection>' 
from /home/marco/workspace/backend/app/models/media_collection/photo_album.rb:1:in `<top (required)>'

为 MediaType::Photo.new

而且是相同的：

NoMethodError: private method `existence_check' called for MediaType::Photo:Class 
from /home/marco/.rvm/gems/ruby-2.4.0/gems/mongoid-6.1.0/lib/mongoid/relations/macros.rb:355:in `relate' 
from /home/marco/.rvm/gems/ruby-2.4.0/gems/mongoid-6.1.0/lib/mongoid/relations/macros.rb:56:in `embedded_in' 
from /home/marco/workspace/backend/app/models/media_type/photo.rb:15:in `<class:Photo>' 
from /home/marco/workspace/backend/app/models/media_type/photo.rb:2:in `<module:MediaType>' 
from /home/marco/workspace/backend/app/models/media_type/photo.rb:1:in `<top (required)>'

什么问题？如果我删除（仅用于调试）关系embeds_many和embedded_in，问题已解决，但我需要嵌入这些文档！

也许Rails可以找不到:photos，但我指定class_name: 'MediaType::Photo'为mongoid文档建议，同样是为'MediaCollection::PhotoAlbum'

我需要帮助规定。谢谢。

来源

2017-05-14 Marco Sanfilippo

我终于找到原因，但没有解决方案，是宝石上的一个bug。

请看这里：github issue

来源

2017-05-24 20:15:50

NoMethodError：私人方法`exists_check'要求类

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