text: var mongoose = require('mongoose'); 
  
  var userSchema = new mongoose.Schema({
      username : String, 
      venmoId: String,
      access_token: String,
      loans_taken: [ mongoose.Schema.Types.ObjectId ], 
      loans_given: [ mongoose.Schema.Types.ObjectId ]
  }); 
  
  var user = mongoose.model('User', userSchema); 
  
  module.exports = user; 