text: const mongoose= require("mongoose");
  var Float = require('mongoose-float').loadType(mongoose, 4);
  
  module.exports= new mongoose.Schema({
      _id: {
          type:String,
          trim: true,
          required: true,
          unique:true,
          maxLength: 3
      },
      rate_refto_usd: {
          type: Float,
          required: true
      },
      description: {
          type:String,
          trim: true,
          required: true
      }
  });