upsert issue

gistfile1.txt

the data

{ _id: '4db932f1d50e96fda3c84b1b',
  email: 'email@email.com',
  encrypted_password: 'password',
  friends: 
   [ '4db96b973d01205364000006',
     '4db94a1948a683a176000001',
     '4dc77b24c5ba38be14000002' ],
  location: [ 72.4930088, 23.0431957 ],
  name: 'Amit Kumar',
  password_salt: 'salty',
  profile_fields: 
   [  ],
  username: 'amit' }