Python 在Django中迭代模型实例变量
考虑一个定义如下的模型:Python 在Django中迭代模型实例变量,python,django,django-models,Python,Django,Django Models,考虑一个定义如下的模型: class ProblemVerificationModel(CreateUpdateDateModel): problem = models.ForeignKey(Problem, related_name="problem_survey") verifier = models.ForeignKey(settings.AUTH_USER_MODEL, related_name="verified_problem") is_problem_pr
class ProblemVerificationModel(CreateUpdateDateModel):
problem = models.ForeignKey(Problem, related_name="problem_survey")
verifier = models.ForeignKey(settings.AUTH_USER_MODEL, related_name="verified_problem")
is_problem_properly_formated = ... # BooleanField
some_field = ... #BooleanField
some_other_field = ... #BooleanField
我需要找到
ProblemVerificationModel
模型实例的所有类整数值(True
->1,False
->0)之和。我可以通过使用instance.field
访问每个字段来添加这些值,然后将它们全部添加。然而,我想知道是否有更干净的方法可以做到这一点。我想写一个这样做的方法会更像python。除非必要,否则我不会对要使用的字段使用动态列表,因为您不会经常更改模型
class ProblemVerificationModel(CreateUpdateDateModel):
...
is_problem_properly_formated = ... # BooleanField
...
def get_bool_sum(self):
bool_fields = (
'is_problem_properly_formated',
'some_field',
'some_other_field',
)
return sum(bool(getattr(self, field)) for field in bool_fields)
您可以使用模型的,以便动态收集所有整数-
和布尔字段及其子类型:
class ProblemVerificationModel(CreateUpdateDateModel):
#...
def int_sum(self):
return sum(
getattr(self, f.name) or 0 for f in self._meta.get_fields()
if isinstance(f, (IntegerField, BooleanField))
)