如何更改Django模型中的选项？

I have a Django model that uses the choices attribute.

我有一个使用choices属性的Django模型。

COLOR_CHOICES = (
    ('R', 'Red'),
    ('B', 'Blue'),
)
class Toy(models.Model):
    color = models.CharField(max_length=1, choices=COLOR_CHOICES)

My code is in production and now I'd like to add additional choices.

我的代码正在生产中，现在我想添加其他选择。

COLOR_CHOICES = (
        ('R', 'Red'),
        ('B', 'Blue'),
        ('G', 'Green'),
 )

How do I go about doing this? Does Django use Database constraints to enforce choices? Do I need to do a Database migration (I'm using South)? Or does Django just enforce the choices restriction in Python code and all I have to do is change the code and restart?

我该怎么做呢？ Django是否使用数据库约束来强制执行选择？我是否需要进行数据库迁移（我正在使用South）？或者Django只是在Python代码中强制执行选择限制，我所要做的就是更改代码并重新启动？

Thanks!

谢谢！

2 个解决方案

#1

Django doesn't enforce choices on a database level, it only uses them for the presentation of the widgets and in validation. If you want them a bit more 'dynamic', for example to have different ones on different servers you could define them via settings.py:

Django不强制在数据库级别上进行选择，它只使用它们来呈现小部件和验证。如果你想要它们更“动态”，例如在不同的服务器上有不同的，你可以通过settings.py定义它们：

from django.conf import settings

COLOR_CHOICES = getattr(settings, 'COLOR_CHOICES',(
        ('R', 'Red'),
        ('B', 'Blue'),
        ('G', 'Green'),
 ))

Then you could define different choices in your settings.py (no need for any database migration!).

然后，您可以在settings.py中定义不同的选项（无需任何数据库迁移！）。

#2

The field is models.CharField so the database will treat it like any other models.CharField set up in django :)

该字段是models.CharField所以数据库将像任何其他models.CharField设置在django :)

No, it doesn't enforce choices / you don't need to touch your DB.

不，它不会强制执行选择/您不需要触摸您的数据库。

#1

from django.conf import settings

COLOR_CHOICES = getattr(settings, 'COLOR_CHOICES',(
        ('R', 'Red'),
        ('B', 'Blue'),
        ('G', 'Green'),
 ))