How to delete referenced data using mongoose - node.js

Question

I have two schemas as below.
MirFile Schema
const mongoose = require("mongoose");
const {ObjectId} = mongoose.Schema
// Creating a Schema for uploaded files
const MirFileSchema = new mongoose.Schema({
createdAt: {
type: Date,
default: Date.now,
},
name: {
type: String,
required: [true, "Uploaded file must have a name"],
},
image:{
type:String
},
belongsTo:{
type:ObjectId,
ref:"MirFolder"
}
});
const File = mongoose.model("MirFile", MirFileSchema);
MirFileSchema.pre('remove', function(next) {
MirSubFile.remove({belongsTo: this._id}).exec();
next();
});
module.exports = File;
MirSubFileSchema
const mongoose = require("mongoose");
const {ObjectId} = mongoose.Schema
// Creating a Schema for uploaded subfiles
const MirSubFileSchema = new mongoose.Schema({
createdAt: {
type: Date,
default: Date.now,
},
text: {
type: String,
required: [true, "Uploaded file must have a text"],
},
image:{
type:String
},
belongsTo:{
type:ObjectId,
ref:"MirFile"
}
});
const File = mongoose.model("MirSubFile", MirSubFileSchema);
module.exports = File;
When I delete MirFile the document from MirSubFile which holds the _id of MirFile in belongsTo field must be deleted.I have used prehook but its not working.Any guide.?

Answer 1

Why don't you simply add your own 'deleteOne' or 'remove' Mongoose middleware on the MirFileSchema to deleteOne or remove all other documents
exports.DeleteMirFileSchema = (req, res) => {
MirFileSchema.deleteOne({ _id: req.query._id }, { new: true }, (err, data) => {
if (err) {
console.log(err);
let errorKeyArray = Object.keys(err.errors);
let msgArray = errorKeyArray.map((obj) => {
return err.errors[obj];
});
ResponseObj.errorResponse(res, { status: 400, msg: msgArray.join(", ") });
} else ResponseObj.successResponse(res, data);
});
};