Django 模型继承了所有超级模型字段,除了 IntegerField

Django model is inheriting all super model Fields, except for IntegerField

我有一个奇怪的问题,我有一个模型的层次结构,一个抽象的用户 class:

class User(AbstractBaseUser):
    user_name = models.CharField(max_length=32, unique=True)
    email = models.EmailField(max_length=255, unique=True, null=True)
    phone = PhoneNumberField()
    access_token = models.CharField(max_length=255, unique=True, null=True)
    notifications_token = models.CharField(max_length=255, unique=True, null=True)
    photo = models.ImageField(null=True)
    person_in_contact = models.CharField(max_length=32, null=True)
    active = models.BooleanField(default=False)
    confirmedEmail = models.BooleanField(default=False)
    confirmedPhone = models.BooleanField(default=False)
    completedProfile = models.BooleanField(default=False)
    visible = models.BooleanField(default=True)

    @property
    def is_active(self):
        return self.active

    # def __str__(self):
    #     return "Client : " + self.user_name + " Email:" + self.email

    def get_email(self):
        return self.email

    USERNAME_FIELD = 'user_name'

    REQUIRED_FIELDS = ['user_name', 'phone', 'password']

    class Meta:
        abstract = True

然后一个人 class 和一家公司(这家公司没问题)class 从这家公司继承:

class Person(User):
    GENDER = (('F', 'FEMALE'), ('M', 'MALE'))

    name = models.CharField(max_length=50, null=True)
    surname = models.CharField(max_length=50, null=True)
    adress = models.CharField(max_length=255, null=True)

    birth_date = models.DateField(null=True)
    gender = models.CharField(max_length=1, choices=GENDER, null=True)
    age = models.IntegerField(null=True)

    def age(self):
        today = date.today()
        return today.year - self.birth_date.year

    # def __str__(self):
    #     return super().__str__() + " Name : " + self.name

    class Meta:
        abstract = True

如您所见,IntegerField() 的唯一字段是年龄字段。 现在我有一个旅行者和一个 Driver class 继承自 class 的人, 问题是年龄字段,没有显示在数据库中,除非我在 classes 之一中覆盖它,这就是我所做的,我在旅行者中覆盖它所以它出现在数据库中,但没有'在 driver 中没有覆盖它,所以它没有显示。 旅行者:

class Traveller(Person):
    photo = models.ImageField(null=True, upload_to='travellers/profile_pictures')
    age = models.IntegerField(null=True)

    class Meta:
        verbose_name_plural = 'Travellers'

Driver:

class Driver(Person):
    rating = models.DecimalField(default=0, decimal_places=1, max_digits=3)
    driving_license = models.CharField(max_length=50, null=True)
    insurance_number = models.CharField(max_length=50, null=True)
    company = models.ForeignKey(TransportCompany, on_delete=models.DO_NOTHING, null=True)
    photo = models.ImageField(null=True, upload_to='drivers/profile_pictures')

我需要知道如何解决这个问题,或者有什么问题,我们将不胜感激。

发生这种情况的原因是您的 age 字段与 age 函数同名。结果,age = ... 字段被 Python 忽略,取而代之的是 age 函数,因为那是您最后一次定义 age 变量。

出于同样的原因,age 字段在子类中弹出:您在那里定义了一个 age 变量,它优先于 "inherited" age 方法。

您应该重命名两者之一。例如:

class Person(User):
    GENDER = (('F', 'FEMALE'), ('M', 'MALE'))

    name = models.CharField(max_length=50, null=True)
    surname = models.CharField(max_length=50, null=True)
    adress = models.CharField(max_length=255, null=True)

    birth_date = models.DateField(null=True)
    gender = models.CharField(max_length=1, choices=GENDER, null=True)
    <b>_age</b> = models.IntegerField(null=True)

    def age(self):
        today = date.today()
        bod = self.birth_date
        before_dob = (today.month, today.day) < (bod.month, bod.day)
        return today.year - self.birth_date.year - before_dob

    class Meta:
        abstract = True

请注意,age的计算并不完全准确:如果我们是在那一年的生日之前,则需要从年龄中减去一。