我有一个名为Chat的模式:
var ChatSchema = new Schema({
vehicle: { type: Schema.Types.ObjectId, ref: 'Vehicle' },
messages: [String]
});
...和另一个名为Vehicle的模式:
var VehicleSchema = new Schema({
make: { type: Schema.Types.ObjectId, ref: 'Make' },
model: { type: Schema.Types.ObjectId, ref: 'Model' }
});
我需要一个填充车辆的查询,但也需要#34; make"和"模型"车内的字段。我试过这个但是无法使它发挥作用。尝试过路径但没有成功。
Chat.find(function (err, chats) {
if (err)
res.json({ success: false, response: err });
if (chats.length == 0)
res.json({ success: false, response: "Nothing found." });
else
res.json({ success: true, response: { chats: chats } });
}).populate('vehicle make model');
答案 0 :(得分:1)
嵌套人口必须在单独的步骤中完成,这使得它有点尴尬,但你可以使用这样的方法来实现:
Chat.find().populate('vehicle').exec(function (err, chats) {
Make.populate(chats, 'vehicle.make', function (err, chats) {
ModelModel.populate(chats, 'vehicle.model', function (err, chats) {
if (err)
res.json({ success: false, response: err });
if (chats.length == 0)
res.json({ success: false, response: "Nothing found." });
else
res.json({ success: true, response: { chats: chats } });
});
});
});
文档here。