text: var mongoose = require('mongoose');
  var Schema = mongoose.Schema;
  
  var SecretarySchema = new Schema({
      doctorId:{
          type: Schema.Types.ObjectId, ref: 'doctor'
      },
      _id :{
          type: Schema.Types.ObjectId, ref: 'user'
      },
  });
  
  module.exports = mongoose.model('secretary', SecretarySchema);