def _get_statistic(self, collection):
        statistic = collection.find_one({'project': self.name})
        if statistic:
            return statistic
        else:
            return {}
Acts as `Field.accepts` but returns result of every child field 
dataset/ETHPy150Open nvbn/coviolations_web/projects/models.py/Project._get_statistic--crossover with--dataset/ETHPy150Open SmartTeleMax/iktomi/iktomi/forms/fields.py/FieldBlock.accept