def _delete_all_uses(self):
        session = self.Session()
        try:
            uu = session.query(model.DbUserUsedExperiment).all()
            for i in uu:
                session.delete(i)
            session.commit()
        finally:
            session.close()
Tests that the filter_for_obj_permission returns a list of all users
dataset/ETHPy150Open weblabdeusto/weblabdeusto/server/src/weblab/core/db.py/DatabaseGateway._delete_all_uses--crossover with--dataset/ETHPy150Open fp7-ofelia/ocf/expedient/src/python/expedient/common/permissions/tests/tests.py/TestObjectPermissions.test_filter_for_obj_permission