node.js - Mongoose只保存对象_id值的数组

Question

我试图将消息数组发布到 Mongoose 数据库，但它只保存 _id 属性，而不是内容和发件人属性。我做错了什么？

组架构:

var GroupSchema = new mongoose.Schema({
    name: {
        type: String,
        required: true,
        minlenght: 1,
        trim: true
    },
    messages: {
        type: [{type: Schema.ObjectId, ref: 'Message'}]
    },
    _creator: {
        type: mongoose.Schema.Types.ObjectId,
        required: true
    }
});

消息架构:

var MessageSchema = new mongoose.Schema({
    content: {
        type: String,
        required: true,
        minlenght: 1,
        trim: true
    },
    sender: {
        type: String,
        required: true
    }
});

POST/rooms 路线而不保存

const messages = [];
for (const m of req.body.messages) {
    messages.push(new Message(m));

}

var group = new Group({
    name: req.body.name,
    _creator: req.user._id,
    messages: messages
});

JSON data in postman

When I run GET I only get back the messages objectID values

Answer 1

这是设计使然。您可以通过以下方式在 GroupSchema 和 MessageSchema 之间进行交叉引用:

messages: {
    type: [{type: Schema.ObjectId, ref: 'Message'}]
}

这意味着 GroupSchema/messages 将仅包含与您的 Messages 集合交叉引用的消息的 ObjectId。

您需要使用populate获取实际的文档加载。

The ref option is what tells Mongoose which model to use during population.