未定义"/>
猫鼬populate()返回未定义
我正在尝试与node.js,Express和MongoDB创建聊天。我有两种猫鼬模型:用于聊天室和消息。
房间模型:
const RoomSchema = new mongoose.Schema({
name: {
type: String,
required: true,
},
owner: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Users',
required: true,
},
messages: {
type: [mongoose.Schema.Types.ObjectId],
ref: 'Messages',
required: true,
},
users: {
type: [mongoose.Schema.Types.ObjectId],
ref: 'Users',
required: true,
},
});
const Room = mongoose.model('Rooms', RoomSchema);
消息模型:
const MessageSchema = new mongoose.Schema({
text: {
type: String,
required: true,
},
sendBy: {
type: String,
required: true
}
});
const Messages = mongoose.model('Messages', MessageSchema);
和显示所有消息的功能
prepareMessages: function (name, callback) {
rooms.findOne({
name: name,
}).populate('messages')
.exec(function (err, room) {
let result = '';
if (!room) {
console.log("Chat does not exist");
throw err;
}
else {
room.messages.forEach(function (item, i, arr) {
result += '<dt>' + item.sendBy + '</dt>';
result += '<dd>' + item.text + '</dd>';
});
}
callback(result)
});
},
我为什么得到
TypeError: Cannot read property 'sendBy' of undefined
?
我尝试过.populate('rooms.messages')
,.populate({path: 'rooms.messages', model:'Messages')
和其他变体,但仍然无法使用。请帮帮我!
在“房间模式”中,您将消息定义为对象类型为ObjectId的对象,虽然它应该是元素数组,每个元素都为ObjectId类型,消息应该是ObjectIds数组,并且用户为好
const RoomSchema = new mongoose.Schema({
name: {
type: String,
required: true,
},
owner: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Users',
required: true,
},
messages: [{ // note here messages is an array
type: mongoose.Schema.Types.ObjectId,
ref: 'Messages',
required: true,
}],
users: [{
type: mongoose.Schema.Types.ObjectId,
ref: 'Users',
required: true,
}],
});
const Room = mongoose.model('Rooms', RoomSchema);
希望有帮助
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猫鼬populate()返回未定义
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