Django，无法导入名称~~错误，但我无法找到原因

Question

app1：title // title.models.py

from django.db import models
from relationship.models import ContentRelationship
from django.contrib.auth.models import User

class Title(models.Model):
    titleText = models.TextField(max_length=160, unique=True)
    titleRelationship = models.OneToOneField('relationship.ContentRelationship', on_delete=models.CASCADE)

    def __str__(self):
        return self.titleText

app2：关系// relationship.models.py

from title.models import Title

class ContentRelationship(models.Model):
    allow_set = models.ManyToManyField('UserRelationship', related_name="wdt_set", symmetrical=False, through="Wdt", blank=True)
    description = models.TextField(max_length=200, blank=True)

    def __str__(self):
        return self.description

@receiver(post_save, sender=Title)
def create_contentrelationship(sender, instance, created, **kwargs):
    if created:
        ContentRelationship.objects.create(Title=instance)

@receiver(post_save, sender=Title)
def save_contentrelationship(sender, instance, **kwargs):
    instance.contentrelationship.save()

我想要的是，如果我创建了Title实例，那么也会创建ContentRelationship。

但是在那段代码上，有

File "C:/Dev/TestProject/Test1\title\models.py", line 2, in <module> from relationship.models import ContentRelationship ImportError: cannot import name 'ContentRelationship'

我搜索并谨慎地ForeignKey or ManyToManyField来论证'relationship.ContentRelationship'。换句话说，我把它变成了字符串。

但它不起作用。

修改 我的项目结构：

我删除的部分名字很差。所以我删除了它。遗憾。

Answer 1

尝试删除此导入：

from relationship.models import ContentRelationship 

因为你不需要它。您正在使用字符串

'relationship.ContentRelationship'