How to Correctly Filter Users by Age Range Using SQLAlchemy Date Fields?

SQLAlchemy: Filtering Date Fields

In a scenario where a User model defines a 'birthday' field as a Date data type, arise the need to filter users based on an age range. To achieve this with SQLAlchemy, one might initially consider and attempt:

query = DBSession.query(User).filter(
    and_(User.birthday >= '1988-01-17', User.birthday <= '1985-01-17')
) 

However, this attempt falls short of accuracy. The corrected filter is:

qry = DBSession.query(User).filter(
    and_(User.birthday <= '1988-01-17', User.birthday >= '1985-01-17')
)

or equivalently:

qry = DBSession.query(User).filter(User.birthday <= '1988-01-17').\
    filter(User.birthday >= '1985-01-17')

Alternatively, the between operator can be employed for the same purpose:

qry = DBSession.query(User).filter(User.birthday.between('1985-01-17', '1988-01-17'))

These approaches ensure that records within the specified date range are accurately selected.

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