definma-api/src/models/measurement_template.ts

import mongoose from 'mongoose';
import db from '../db';

const MeasurementTemplateSchema = new mongoose.Schema({
  first_id: mongoose.Schema.Types.ObjectId,
  name: String,
  version: Number,
  parameters: [new mongoose.Schema({
    name: String,
    range: mongoose.Schema.Types.Mixed
  } ,{ _id : false })]
}, {minimize: false});  // to allow empty objects

// changelog query helper
MeasurementTemplateSchema.query.log = function <Q extends mongoose.DocumentQuery<any, any>> (req) {
  db.log(req, this);
  return this;
}

export default mongoose.model<any, mongoose.Model<any, any>>('measurement_template', MeasurementTemplateSchema);