Django - How does a query query itself? -


i have 2 models

product   id:   delivery_date: datetimefield   contract: fk  contract   id:   safety_days: integerfield

i need products deliver in next x days. x defined in contract safety_days.

products = product.objects.filter(    q(delivery_date__lte=(datetime.datetime.now() + timedelta(days=contract__safety_days))) )

however,i not able do:

days = contract__safety_days

i not know how can reference object inside query dynamically.

best regards, ruben barros

you need use f expressions query. query following way:

products = product.objects.filter(     q(delivery_date__lte=(datetime.datetime.now() + timedelta(days=f('contract__safety_days')))) )

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