“Virtual de Mongoose” Respostas de código

Virtual de Mongoose

userSchema.virtual('id').get(function () {
    return this._id.toHexString();
})

userSchema.set('toJson', {virtual: true})
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Virtuais de Mongoose

//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
Shirshak kandel

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