将新项目添加到MongoDB数组时出错

Question

I am trying to add a new item to Treatment array.It's basically to store the list of procedures offered by a particular hospital.Hospital id is a unique id for a hospital and its created by a post api along with the list of treatments offered by that hospital.Later when hospital introduce a new surgical procedure,i need to add that into the treatment array,for that i have created a put API

I am getting the following error whenever I call the below snippet in API

The positional operator did not find the match needed from the query. Unexpanded update: Treatment.$.procedureid

Please help me to resolve it.

You can find the model and controller code below:

Schema definition

var hospitalDoctorSchema = new Schema({
    hospitalID: { type: Number, required: true, unique: true, dropDups: true, default: 10000 },   
    Treatment: [{        
        procedureid: { type: Number},
        departmentId: { type: Number},
                name: { type: String, required: true, trim: true },
                costUpperBound: { type: Number, required: true },
                costLowerBound: { type: Number, required: true },                   
                departmentName: { type: String, required: true, trim: true},


    }],
    updated_at: { type: Date, required: true, default: Date.now }
});

Controller code to add new item to treatment array:

 hospitalModel.findOneAndUpdate({ "hospitalID": 10000}, { "$set": {"Treatment.$.procedureid"=1100}, { returnOriginal: false, upsert: true }, function (err, doc) {
    if (err) {
        logger.error("Error while updating record : - " + err.message);
        return res.status(500).json({ "Message": err.message });
    } else if (doc === null) {
        logger.error("Error while updating record : - Hospital not found in database");
        return res.status(408).json({ "Message": "Hospital not found in database" });
    }   

    res.status(200).json({ "Message": "Hopsital details for " + hospitalName + " have been updated successfully" });
});

Answer 1

If you would like to add a new element to the array then you can use the $push operator like the following:

hospitalModel.findOneAndUpdate({ "hospitalID": 10000}, 
{ "$push": {"Treatment" : { "procedureid" : 1100 } } }, 
{ returnOriginal: false, upsert: true }, function (err, doc) { ... });

Answer 2

If you want to add a new element in array. You have to use $push instead of $set . Because $push which is used to insert element and $set which used only for updation. So

hospitalModel.findOneAndUpdate({ "hospitalID": 10000},{"$push": 
{"Treatment" : { "procedureid" : 1100 } } }, { returnOriginal: false, 
upsert: true }, function (err, doc) { ... });