def add_constraints(self):
        self._set_join()

        if BelongsToMany._constraints:
            self._set_where()
called when finshed running all tasks
dataset/ETHPy150Open sdispater/orator/orator/orm/relations/belongs_to_many.py/BelongsToMany.add_constraints--crossover with--dataset/ETHPy150Open pydoit/doit/doit/reporter.py/JsonReporter.complete_run