我知道很多次都会问这个问题,但我对mongodb / mongoose有点新意见!目前我正在研究用于医疗软件的MEAN堆栈 . 以下是我的架构:
var usersSchema = new Schema({
_id : {type : mongoose.Schema.ObjectId}
//...
});
mongoose.model('Users', usersSchema);
var doctorsSchema = new Schema({
_id : {type : mongoose.Schema.ObjectId},
userid : {type : mongoose.Schema.ObjectId, ref : 'Users' },
//...
});
mongoose.model('Doctors', doctorsSchema);
var appointmentsSchema = new Schema({
_id : {type : mongoose.Schema.ObjectId},
doctorids : [ {type : mongoose.Schema.ObjectId, ref : 'Doctors'} ]
//...
});
mongoose.model('Appointments', appointmentsSchema);
Nested Mongoose Populate :我如何在Appointments.find()上实现嵌套的mongoose populate,其方式是Appointments.find() . populate('doctorids')应该填充Doctors数组,而医生数组依次填充Users每个Doctor点数至 . 根据https://github.com/LearnBoost/mongoose/wiki/3.6-Release-Notes#population,他们添加了Model.Populate!所以我尝试了这个,但它没有填充在doctorids里面的用户
Appointments
.find({})
.populate('doctorids') // This is working
.exec(function (err, doc) {
if (err) {
handleError(err);
return;
}
Doctors //**Shouldn't this populate the doctors Users inside Doctors?**
.populate(doc, {path: 'doctorids.userid'}, function(err, doc) {
});
res.json({
appointments: doc //Appointsments.Doctorids[].Userid is NOT populated
});
});
[编辑:将其他问题移至新帖子@ https://stackoverflow.com/questions/27412928/mongoose-nested-populate-sort-search-referenced-attributes]
1 回答
有很多问题,我将只解决人口密集的问题(第一个问题) . (另外,我建议你将问题分成多个问题,以防人们得到答案但不是全部 . )
虽然Mongoose支持嵌套填充,但您必须在每个模型上手动调用
populate
以在每个嵌套级别填充 . 或者,您可以使用mongoose-deep-populate插件执行此操作(免责声明:我是该插件的作者) . 例如,您可以写这个来填充医生和用户:您还可以指定Mongoose populate options来控制每个填充路径的排序顺序,如下所示:
查看插件documentation以获取更多信息 .