迁移未检测到 Django 自定义字段更改

Question

我在 Django 中有多个自定义字段。首先，他们扩展了 PositiveSmallIntegerField，因为我们使用了 int 选择，例如：

class BusinessLegalFormField(models.PositiveSmallIntegerField):
    choices = [(1,'SRO'), (2, ....]

    def __init__(self, *args, **kwargs):
        if not args or not args[0]:
            kwargs.setdefault('verbose_name', 'Právna forma')

        kwargs['choices'] = self.choices
        super().__init__(*args, **kwargs)

然后我改成CharField和TextChoices:

class BusinessLegalFormField(models.CharField):
    class Choices(models.TextChoices):
        ZIVNOST = 'zivnost', 'Živnosť'
        SRO = 'sro', 'Spoločnosť s ručením obmedzeným'
        AS = 'as', 'Akciová spoločnosť'

    def __init__(self, *args, **kwargs):
        if not args or not args[0]:
            kwargs.setdefault('verbose_name', 'Právna forma')
        kwargs.setdefault('max_length', 64)
        kwargs['choices'] = self.Choices.choices
        super().__init__(*args, **kwargs)

问题是我刚刚意识到 Django 没有检测到类型更改。当我将 null=True 之类的内容更改为 null=False 时，它会被检测到，但数据库类型并未从数字更改为字符。

我怎样才能让它发挥作用？

Answer 1

这种情况及其解决方案是 described in the documentation:

You can’t change the base class of a custom field because Django won’t detect the change and make a migration for it... You must create a new custom field class and update your models to reference it.
class CustomCharField(models.CharField):
    ...

class CustomTextField(models.TextField):
    ...

迁移未检测到 Django 自定义字段更改

Django custom field change not detected by migrations

python

django

django-models

django-migrations

django-database