text: var mongoose = require('mongoose');
  var schema = mongoose.Schema;
  var addr_req = new schema({
      "username":{
          type:String,
          required:true,
          unique:true
      },
      "address":{
          type:String,
          required:true,
      }
  },{collection:'addr_req'});
  
  module.exports = mongoose.model('addr_req',addr_req);