问题：Django模型中字段的默认值

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)

目前，我正在使用默认的admin创建/编辑此类型的对象。如何b从管理员中删除该字段，以使每个对象都无法创建一个值，而是会收到默认值0000000？

点击查看英文原文

Suppose I have a model:

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?

回答 0

设置editable为False和default为默认值。

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

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

另外，您的id字段是不必要的。Django将自动添加它。

点击查看英文原文

Set editable to False and default to your default value.

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

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

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

回答 1

您可以这样设置默认值：

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

然后您可以使用模型的Admin类隐藏字段，如下所示：

class SomeModelAdmin(admin.ModelAdmin):
    exclude = ("b")
点击查看英文原文

You can set the default like this:

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

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

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

回答 2

您还可以在默认字段中使用callable，例如：

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

然后定义可调用项：

def foo():
    return 'bar'
点击查看英文原文

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

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

And then define the callable:

def foo():
    return 'bar'
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