Django模型中字段的默认值

Suppose I have a model:

假设我有一个模型:

class SomeModel(models.Model):
    id = models.AutoField(primary_key=True)
    a = models.CharField(max_length=10)
    b = models.CharField(max_length=7)

Currently I am using the default admin to create/edit objects of this type. How do I remove the field b from the admin so that each object cannot be created with a value, and rather will receive a default value of 0000000?

目前，我正在使用默认的admin来创建/编辑此类对象。如何从admin中删除字段b，以便不能使用值创建每个对象，而是接收到默认值0000000?

3 个解决方案

#1

106

Set editable to False and default to your default value.

将editable设置为False，并将其设置为默认值。

http://docs.djangoproject.com/en/dev/ref/models/fields/#editable

http://docs.djangoproject.com/en/dev/ref/models/fields/编辑

b = models.CharField(max_length=7, default='0000000', editable=False)

Also, your id field is unnecessary. Django will add it automatically.

而且，您的id字段是不必要的。Django将自动添加它。

#2

You can set the default like this:

可以这样设置默认值:

b = models.CharField(max_length=7,default="foobar")

and then you can hide the field with your model's Admin class like this:

然后你可以用你的模型的管理类来隐藏这个字段:

class SomeModelAdmin(admin.ModelAdmin):
    exclude = ("b")

#3

You can also use a callable in the default field, such as:

您还可以在默认字段中使用callable，例如:

b = models.CharField(max_length=7, default=foo)

And then define the callable:

然后定义可调用的:

def foo():
    return 'bar'

#1

106