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我在运行 Mongoid 2.4 的 Sinatra 应用程序中删除嵌入文档时遇到问题。这是我的模型关系的基本概述：

class User
    has_many :posts
end

class Post
    belongs_to :user
    embeds_many :comments
    embeds_many :likes, as: :likeable
end

class Comment
    field :poster_id, type: String
    embedded_in :post
    embeds_many :likes, as: :likeable
end

class Like
    field :user_id, type: String
    embedded_in :likeable, polymorphic: true
end

删除代码是这样开始的，没有问题：

# Deletes comments the user created
Post.where('comments.poster_id' => params[:userid]).each do |post|
    post.comments.where(poster_id: params[:userid]).delete_all
end

# Delete likes on posts the user created
Post.where('likes.user_id' => params[:userid]).each do |post|
    post.likes.where(user_id: params[:userid]).delete_all
end

但是，当尝试删除喜欢的帖子评论时，mongoid 失败。似乎它不能深入两个层次：

# Delete likes on comments the user created (broken)
Post.where('comments.likes.user_id' => params[:userid]).each do |post|
  post.comments.likes.where(user_id: params[:userid]).delete_all
end

我怎样才能删除它们？

4

1 回答 1

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# Delete likes on comments the user created (not broken anymore)
Post.where('comments.likes.user_id' => params[:userid]).each do |post|
  post.comments.each {|c| c.likes.where(user_id: params[:userid]).delete_all }
end

你需要迭代评论，comments.likes一定会给你错误，不是吗？

于 2012-12-13T14:53:19.900 回答