def fromParams(req):
if param_exist("id",req):
e = CardData(pk=req['id'])
else:
e = CardData()
c = Card(pk=req['card.id'])
e.date=DateService.invert(req['date'])
e.shop=req['shop']
e.instalments=req['instalments']
e.total=req['total']
e.card = c
return e
