SqlAlchemy. TypeError: filter_by() takes exactly 1

问题:

I upgraded sqlalchemy from 0.7 to 0.9.6. After upgrade I am getting the following error:

TypeError
TypeError: filter_by() takes exactly 1 argument (2 given)

howerver before it was working without any issue. How can I manage that issue?

回答1:

Without seeing code, obviously you are calling filter_by wrong. filter_by takes only the implicit self (the 'exactly 1 argument' meaning exactly 1 positional argument) and optional keyword arguments. You are providing filter_by another positional argument, possibly a dictionary.

The syntax is:

query.filter_by(column1=value, column2=value)

Whereas for filter:

query.filter(Model.column1 == value, Model.column2 == value)