Remove `__v` and `_id` from MongoDB

service.js

import mongoose, {Schema} from 'mongoose'

export const ServiceSchema = new Schema({
  displayName: {type: String, required: true, unique: true}
})

ServiceSchema.set('toObject', {
  transform: function (doc, ret) {
    ret.id = ret._id
    delete ret._id
    delete ret.__v
  }
})

export default mongoose.model('Service', ServiceSchema)

// inspired by https://gist.github.com/fiveisprime/9749782