如何在Mongooese数组中填充字段？

debugcn 发表于 Dev

cauchuyennhocuatoi

我有一个这样的收集模式：

const PrescriptionSchema = new Schema({
    patientId:{type: mongoose.Schema.ObjectId, ref: 'User'},
    prescriptionName: String,
    prescriptionNote: String,
    prescriptionDate: Date,
    diseaseId: {type: mongoose.Schema.ObjectId, ref: 'Diseases'},
    drugs: [{
        drugcateId:{type: mongoose.Schema.ObjectId, ref: 'DrugCategory'},
        quantity: Number,
        howtouse: String
    }],
    is_deleted: {type: Boolean, default: false},
    createdBy: {type: mongoose.Schema.ObjectId, ref: 'User'}
}, {
        timestamps: true,
        collection: 'prescriptions'
    }
);
export default mongoose.model('prescriptions', PrescriptionSchema );

请注意，在此集合中，我有一系列“药物”，这是我从“ DrugCategory”中获得的一系列药物，在每种药物中我都有数量和使用方法..以便将其分组（drugCateId，数量，使用方法）在毒品阵列中。找到处方时，我想在Drugs数组中填充drugCateId。我该怎么做？下面是我当前的代码：

async findOne(req, res){
        const { id } = req.params;
       await Prescriptions.
            findOne({ is_deleted: false, _id: id}).
             .populate(
               {
                 path: 'drugs',
                   populate: {
                     path: 'drugCateId',
                     model: 'DrugCategory'
                   }
               }).
            exec(function (err, data) {
              if (err) return handleError(err);
              res.send(data)
            });
      }

但这是行不通的。以下是我的结果：

{
    "is_deleted": false,
    "_id": "5f32768a06693a520806717d",
    "patientId": "5c80930d447df7735138693e",
    "prescriptionName": "Prescription for you",
    "prescriptionNote": "Please drink follow doctor",
    "prescriptionDate": "2020-07-08T00:00:00.000Z",
    "diseaseId": "5f22a6d600980c081ca9e14f",
    "drugs": [
        {
            "_id": "5f32768a06693a5208067181",
            "drugcateId": "5f23deca04e3150a48632229", // How can I populate this one?
            "quantity": 10,
            "howtouse": "drink 2 times after meal everyday"
        },
        {
            "_id": "5f32768a06693a5208067180",
            "drugcateId": "5f23deca04e3150a48632233", // How can I populate this one?
            "quantity": 10,
            "howtouse": "drink 2 times after meal everyday"
        },
        {
            "_id": "5f32768a06693a520806717f",
            "drugcateId": "5f23deca04e3150a48632234", // How can I populate this one?
            "quantity": 10,
            "howtouse": "drink 2 times after meal everyday"
        },
        {
            "_id": "5f32768a06693a520806717e",
            "drugcateId": "5f23deca04e3150a4863224a", // How can I populate this one?
            "quantity": 10,
            "howtouse": "drink 2 times after meal everyday"
        }
    ],
    "createdBy": "5d1cd947231ceb95b8838c1b",
    "createdAt": "2020-08-11T10:44:26.842Z",
    "updatedAt": "2020-08-11T10:44:26.842Z",
    "__v": 0
}

希望您理解我的问题，请看一看。谢谢

伊皮

您当前的版本与您的架构不匹配。建议您同时填充drugs和drugs.drugcateId。但是这里drugs是直接嵌入的，不能引用另一个集合中的文档，因此不可能populate()：

 .populate({
     path: 'drugs',  // this assumes drugs are objectIds: [{ type: ObjectId, ref: 'Drug' }]
     populate: {
       path: 'drugCateId',
       model: 'DrugCategory'
     }
   })

相反，您应该能够对数组使用点符号：