Question

我希望帖子的创建者成为用户架构。所以我有2个Schema

post.js

const mongoose=require('mongoose');
mongoose.Promise = global.Promise;
const Schema= mongoose.Schema;

const postSchema= new Schema({
    body:{ type: String, required:true, validate:bodyValidators},
    createdBy: { type: Schema.Types.ObjectId,ref:'User'}, // this one
    to: {type:String, default:null },
    createdAt: { type:Date, default:Date.now()},
    likes: { type:Number,default:0},
    likedBy: { type:Array},
    dislikes: { type:Number, default:0},
    dislikedBy: { type:Array},
    comments: [
        {
            comment: { type: String, validate: commentValidators},
            commentator: { type: String}
        }
    ]
});



module.exports = mongoose.model('Post',postSchema);

user.js的

const mongoose=require('mongoose');
mongoose.Promise = global.Promise;
const Schema= mongoose.Schema;

const userSchema=new Schema({
    email: { type: String, required: true, unique: true, lowercase: true, validate: emailValidators},
    username: { type: String, required: true, unique: true, lowercase: true, validate: usernameValidators},
    password: { type: String, required: true,validate: passwordValidators},
    bio: { type:String,default:null},
    location: {type:String, default:null},
    gender: {type:String,default:null},
    birthday: { type:Date,default:null},
    img: { type:String, default:'Bloggy/uploads/profile/avatar.jpeg'}
});

module.exports = mongoose.model('User',userSchema);

当用户创建新帖子时，我将他的_id保存到新的帖子对象

const post= new Post({
        body: req.body.body,
        createdBy:user._id,
        createdAt:Date.now()
});

当我想用他们指定的作者恢复所有帖子时

router.get('/allPosts',(req,res)=>{
        Post.find().populate('createdBy').exec((err,posts)=>{
            if(err){
                res.json({success:false,message:err});
            }
            else{
                if (!posts) {
                    res.json({success:false,message:"No posts found"});
                }
                else{
                    res.json({success:true,posts:posts});
                }
            }
        }).sort({'_id':-1}); // the latest comes first
    });

虽然我跟着the documentation，但它没有工作。我得到的错误是TypeError: Post.find(...).populate(...).exec(...).sort is not a function 我究竟做错了什么？我错过了什么吗？也许这两个模型不在同一个文件中这一事实？

Answer 1

.exec()返回一个Promise，没有名为.sort()的方法。

.sort()与.exec()

之前的Post.find(...).populate(...).sort(...).exec(...)相同

查看documentation中的第3个示例。

Mongoose populate不是一个功能

1 个答案: