Question

嘿，我有两个mongo DB集合，一个用于存储帖子，另一个包含用户详细信息，

这是我的用户的集合>>

{
  _id: objectId(1111111111),
  name: "userOne",
  email: userone@user.com
  picture: "link to profile picture"
},

{
  _id: objectId(2222222222),
  name: "userTwo",
  email: usertwo@user.com
  picture: "link to profile picture"
},

{
  _id: objectId(3333333333),
  name: "userThree",
  email: userthree@user.com
  picture: "link to profile picture"
}

这是帖子集>>

{
  _id: objectId(44444444444),
  title : "Title of the Post",
  content: "Some Content",
  author: objectId(3333333333)
  likes: [
     0: {likeBy:objectId(1111111111),
         Date: "Date of Like"},

     1: {likeBy:objectId(2222222222),
         Date: "Date of Like"}
   ],
  comments: [
     0 : {user: objectId(1111111111),
          comment: "Nice",
          Date: "Date of comment" },

     1 : {user: objectId(2222222222),
          comment: "Good",
          Date: "Date of comment" }
   ]
}

所以我的目标是使用MongoDB聚合框架获取作者详细信息，喜欢的用户详细信息，评论的用户详细信息，该如何做，我已经尝试过进行聚合操作，但是失败了，有人可以引导我以正确的方式进行操作

这是我想要的输出


{
  _id: objectId(44444444444),
  title : "Title of the Post",
  content: "Some Content",
  author: {objectId(3333333333),
           name: "author's name from user collection",
           picture: "author's picture link form user collection" }
  likes: [
     0: {likeBy:objectId(1111111111),
         name: "user's name from user collection",
         picture: "user's picture link form user collection",
         Date: "Date of Like"},

     1: {likeBy:objectId(2222222222),
         name: "user's name from user collection",
         picture: "user's picture link form user collection",
         Date: "Date of Like"}
   ],
  comments: [
     0 : {user: objectId(1111111111),
          comment: "Nice",
          name: "user's name from user collection",
          picture: "user's picture link form user collection",
          Date: "Date of comment" },

     1 : {user: objectId(2222222222),
          comment: "Good",
          name: "user's name from user collection",
          picture: "user's picture link form user collection",
          Date: "Date of comment" }
   ]
}

Mongodb在同一聚合管道中多个$ lookup和$ unwind

0 个答案: