Mongoose.js虚拟填充 [英] Mongoosejs virtual populate

问题描述

我的项目中有一个圆形模型:

I have a circle model in my project:

var circleSchema = new Schema({
//circleId: {type: String, unique: true, required: true},
patientID: {type: Schema.Types.ObjectId, ref: "patient"},
circleName: String,
caregivers: [{type: Schema.Types.ObjectId}],
accessLevel: Schema.Types.Mixed
});

circleSchema.virtual('caregiver_details',{
    ref: 'caregiver',
    localField: 'caregivers',
    foreignField: 'userId'
});

保姆模式:

var cargiverSchema = new Schema({
    userId: {type: Schema.ObjectId, unique: true},  //objectId of user document
    detailId: {type: Schema.ObjectId, ref: "contactDetails"},
    facialId: {type: Schema.ObjectId, ref: "facialLibrary"}, //single image will be enough when using AWS rekognition
    circleId: [{type: Schema.Types.ObjectId, ref: "circle"}],           //multiple circles can be present array of object id
});

样本对象:

{ 
    "_id" : ObjectId("58cf4832a96e0e3d9cec6918"), 
    "patientID" : ObjectId("58fea8ce91f54540c4afa3b4"), 
    "circleName" : "circle1", 
    "caregivers" : [
        ObjectId("58fea81791f54540c4afa3b3"), 
        ObjectId("58fea7ca91f54540c4afa3b2")
    ], 
    "accessLevel" : {
        "location\"" : true, 
        "notes" : false, 
        "vitals" : true
    }
}

我曾尝试为mongoosejs虚拟填充，但无法使其正常工作. 这似乎是完全相同的问题: https://github.com/Automattic/mongoose/issues/4585

I have tried virtual populate for mongoosejs but I am unable to get it to work. This seems to be the exact same problem: https://github.com/Automattic/mongoose/issues/4585

circle.find({"patientID": req.user._id}).populate('caregivers').exec(function(err, items){
        if(err){console.log(err); return next(err) }
        res.json(200,items);
    });

我只得到结果中的对象ID.它没有被填充.

I am only getting the object id's in the result. It is not getting populated.

推荐答案

找出问题所在. 默认情况下，虚拟字段不包含在输出中. 在圈子模式中添加此代码后:

Figured out what the problem was. By default, the virtual fields are not included in the output. After adding this in circle schema:

circleSchema.virtual('caregiver_details',{
    ref: 'caregiver',
    localField: 'caregivers',
    foreignField: 'userId'
});

circleSchema.set('toObject', { virtuals: true });
circleSchema.set('toJSON', { virtuals: true });

现在可以正常使用了.

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