javascript - 在 Mongoose 中引用另一个模式

Question

如果我有两个模式，例如:

var userSchema = new Schema({
    twittername: String,
    twitterID: Number,
    displayName: String,
    profilePic: String,
});

var  User = mongoose.model('User') 

var postSchema = new Schema({
    name: String,
    postedBy: User,  //User Model Type
    dateCreated: Date,
    comments: [{body:"string", by: mongoose.Schema.Types.ObjectId}],
});

我尝试像上面的示例一样将它们连接在一起，但我不知道该怎么做。最终，如果我能做这样的事情，那会让我的生活变得非常轻松

var profilePic = Post.postedBy.profilePic

Answer 1

听起来 populate 方法正是您想要的。首先对您的帖子架构进行一些小改动:

var postSchema = new Schema({
    name: String,
    postedBy: {type: mongoose.Schema.Types.ObjectId, ref: 'User'},
    dateCreated: Date,
    comments: [{body:"string", by: mongoose.Schema.Types.ObjectId}],
});

然后制作你的模型:

var Post = mongoose.model('Post', postSchema);

然后，当您进行查询时，您可以像这样填充引用:

Post.findOne({_id: 123})
.populate('postedBy')
.exec(function(err, post) {
    // do stuff with post
});