const uniqueValidator = require('mongoose-unique-validator'); module.exports = mongoose => { var schema = mongoose.Schema( { phone_title: String, phone_number: String, activated: Boolean, site: Number }, { collection: 'center_phone', timestamps: true } ); schema.method("toJSON", function() { const { __v, _id, ...object } = this.toObject(); object.id = _id; return object; }); schema.plugin(uniqueValidator); const CenterPhone = mongoose.model("center_phone", schema); return CenterPhone; };