[英]Django custom field change not detected by migrations
I have multiple custom fields in Django. First, they extended PositiveSmallIntegerField
as we used int choices like: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)
Then I changed it to CharField
and TextChoices
:然后我将其更改为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)
The problem is that I just realized that Django didn't detect the type change.问题是我刚刚意识到 Django 没有检测到类型更改。 When I change something like null=True
to null=False
it is detected, but the DB type is not changed from number to char.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。
How can I make it work?我怎样才能让它发挥作用?
This very situation, and the solution for it, is described in the documentation : 文档中描述了这种情况及其解决方案:
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.您不能更改自定义字段的基数 class,因为 Django 不会检测到更改并为其进行迁移...您必须创建一个新的自定义字段 class 并更新您的模型以引用它。
class CustomCharField(models.CharField): ... class CustomTextField(models.TextField): ...
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