mongodb - 蒙哥 : How do I insert another subdocument to an existing document

Question

我已经开始学习Mongo了。给定以下集合，例如所谓的帖子，我将如何将新评论插入到现有文档中？我在 mongo 网站上看到的示例是针对“简单”集合的。感谢您的帮助。

{ "_id" : ObjectId( "510a3c5382d395b70b000034" ),

  "authorId" : ObjectId( "..." ),
  "comments" : [ 
    { "_id" : ObjectId( "..." ),
      "authorId" : ObjectId( "..." ),
      "content" : "",
      "createdAt" : Date(...) } ],
  "content" : "Some" } 

Answer 1

你可以试试这样的:

    db.posts.update({ _id: ObjectId( "510a3c5382d395b70b000034" ) },
    {
     $push: { comments: { "_id" : ObjectId( "..." ),
     "authorId" : ObjectId( "..." ),
     "content" : "",
     "createdAt" : Date(...) } }
    })