def lookup_cast(self, lookup_type):
        return "%s"
Decorate the given position with various pieces of data that require pricing (p/l, market_value)
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/backends/__init__.py/BaseDatabaseOperations.lookup_cast--crossover with--dataset/ETHPy150Open fxdemolisher/frano/frano/positions/models.py/decorate_position_with_prices