text: from . import config
  from .base import Base
  from .models import city, user, trip, carrier, station
  
  
  base = Base(config.mongodb['host'], config.mongodb['port'],
              config.mongodb['database'])
  
  City = city.CityCollection(base)
  User = user.UserCollection(base)
  Trip = trip.TripCollection(base)
  Carrier = carrier.CarrierCollection(base)
  Station = station.StationCollection(base)
  
  base.initialize(create_indexes=True)
  