Mongoose virtual
userSchema.virtual('id').get(function () {
return this._id.toHexString();
})
userSchema.set('toJson', {virtual: true})
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userSchema.virtual('id').get(function () {
return this._id.toHexString();
})
userSchema.set('toJson', {virtual: true})//virtual properties are fields that are not stored in the database
//but are computed from other fields.
//we can use them to add extra fields to our schema
//model/tourModel.js
tourSchema.virtual('durationWeeks').get(function() {
//we use this.duration because we want to use this in getter
return this.duration/7
})
const tourSchema= new mongoose.Schema({},{
toJSON:{virtuals:true} // in options object we can pass virtuals:true to get virtual properties in json
})
//we cann't use virtual properties in our query because they are not stored in the database