PostgreSQL NOT operator in SQLAlchemy-CodePudding

I'd like to achieve toggling a boolean flag with just one query.

My query looks as follows:

session.query(Foo).update({"status": SOME_NOT_OPERATOR})

Does SQLAlchemy supports PostgreSQL NOT (https://www.postgresql.org/docs/current/functions-logical.html) operator. How this can be achieved different way?

CodePudding user response：

As Adrian Klaver points out in their comment, SQLAlchemy's not_ operator will toggle the values. All of these statements are equivalent:

# 1.x style
session.query(Foo).update({'status': ~Foo.status})
session.query(Foo).update({'status': not_(Foo.status)})
# 2.0 style
session.execute(update(Foo).values(status=~Foo.status))
session.execute(update(Foo).values(status=not_(Foo.status)))

Will generate this SQL:

UPDATE foo SET status=NOT foo.status