Django：无法向用户添加外键

Question

我正在使用ldap进行身份验证，就像Understanding Django-LDAP authentication。

我的模型是：

class MyFile(models.Model):
    file = models.FileField(upload_to="files")
    slug = models.SlugField(max_length=50, blank=True)
    user = models.ForeignKey(User, unique=True)

但是我无法进行迁移：

python src/manage.py makemigrations
You are trying to add a non-nullable field 'user' to myfile without a default;
we can't do that (the database needs something to populate existing rows).
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows)
 2) Quit, and let me add a default in models.py
Select an option:

然后我输入datetime.date.today()和运行pythonmanage.py迁移错误是：

  File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py", line 915, in get_prep_value
    return int(value)
TypeError: int() argument must be a string or a number, not 'datetime.date'

有什么想法吗？谢谢

更新

class Migration(migrations.Migration):

initial = True

dependencies = [
]

operations = [
    migrations.CreateModel(
        name='MyFile',
        fields=[
            ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
            ('file', models.FileField(upload_to='files')),
            ('slug', models.SlugField(blank=True)),
            ('user', models.ForeignKey(User, blank=True, null=True)),
        ],
    ),
]

错误：

ValueError: Lookup failed for model referenced by field fileupload.MyFile.user: auth.User

Answer 1

您需要为所有现有文件提供默认用户 ID。它必须是一个现有的用户 ID 和一个整数。它不能是 datetime.date.

或者，如果适用，您可以使文件->用户 link 可选:

user = models.ForeignKey(User, blank=True, null=True)

Django：无法向用户添加外键

Django: cannot add foreight key to User

python

django

ldap

django-migrations