text: import mongoose from 'mongoose';
  import instanceModel from 'api/odm';
  
  const userSchema = new mongoose.Schema({
    username: {type: String, unique: true, required: true},
    password: {type: String, select: false, required: true},
    email: {type: String, unique: true, required: true},
    role: {type: String, unique: false, required: true}
  });
  
  let Model = mongoose.model('users', userSchema);
  export default instanceModel(Model);
  