FieldDoesNotExist 与 ManytoMany 字段

Question

我在运行迁移时遇到问题，我收到此错误：

django.core.exceptions.FieldDoesNotExist: Profile has no field named 'following

但我已经在我的模型中定义了字段，可能是什么问题？

下面是我的模型：

class Profile(TimeStampedModel, models.Model):
    
    last_name = models.CharField(_('Last Name'), max_length=150,
                                 null=True, blank=True)
 
    gender = models.CharField(_('Gender'), null=True, max_length=30,
                              choices=GENDER_CHOICES, blank=True)
    following = models.ManyToManyField(User, related_name='following',
                                       default=None, blank=True)

可能是什么问题？

编辑

下面是堆栈跟踪：

https://gist.github.com/huxaiphaer/abd376f43d50625bd3b10fa4829d6b0e

迁移文件：

from django.conf import settings
from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
        ('profiles', '0013_auto_20211108_1641'),
    ]

    operations = [
        migrations.AddField(
            model_name='profile',
            name='following',
            field=models.ManyToManyField(blank=True, default=None,
                                         related_name='following',
                                         to=settings.AUTH_USER_MODEL),
        )
    ]

文件：0013_auto_20211108_1641

from django.conf import settings
from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
        ('profiles', '0012_auto_20211108_0608'),
    ]

    operations = [
        migrations.AlterField(
            model_name='profile',
            name='following',
            field=models.ManyToManyField(blank=True, default=None, null=True, related_name='following', to=settings.AUTH_USER_MODEL),
        ),
    ]

Answer 1

当您已经有一个 following 字段时，您可能进行了迁移 0013，因此这导致了一个 AlterField 迁移，对于（尚未）的多对多关系由迁移构建。

您可以通过删除 AlterField 操作来修复 0013 迁移文件，从而使其成为“无操作迁移”：

从 django.conf 导入设置来自 django.db 导入迁移、模型

class Migration(migrations.Migration):

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
        ('profiles', '0012_auto_20211108_0608'),
    ]

    <strong>operations = []</strong>

这将再次导致迁移运行。

不过，我建议不要将来删除迁移。通常它只会导致迁移回到正轨的问题。

FieldDoesNotExist 与 ManytoMany 字段

FieldDoesNotExist with ManytoMany field

python

django

django-models

django-migrations