def add_fields(self, field_names, allow_m2m=True):
        pass
Write the change to the expression.
dataset/ETHPy150Open charles-vdulac/django-roa/django_roa/db/query.py/Query.add_fields--crossover with--dataset/ETHPy150Open nucleic/enaml/enaml/core/standard_handlers.py/StandardWriteHandler.__call__