uuid作为主键的Django IntegrityError

好的，下面是行为解释

1。我通过管理面板创建一个新的

Post

对象

2.对象已保存

3.之后再创建一个

Post

对象

4.获取错误

django.db.utils.IntegrityError:重复的键值违反了唯一性 约束“lp_post_pkey”详细信息：键 （id）=（5de7b062-14b2-42ef-a9ee-95bbb17ccf3b）已存在

我读过

问题可能与我正在处理的表中的主键序列不同步相同。解决方法是将当前的

主键从最大值+1设置为

但我使用uuid作为主键，这可能不是我的解决方案

那么，如果问题真的存在，我如何同步主键呢

顺便说一句，当我重置
本地服务器
时，我可以重复1-4中的步骤

此外，我还注意到，当我在执行
manage.py makemigrations
时，即使我没有要迁移的内容，我的uuid字段也会不断更改为新字段。这个问题有什么关系吗

型号.py

class SubscriberModel(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4(), unique=True, editable=False)
    email = models.EmailField()
    subscribed = models.DateTimeField(default=timezone.now())
    ip_addr = models.CharField(null=False, max_length=250, default="")
    objects = models.Manager()

    def __str__(self):
        return "{%s}/EMAIL\{%s}/\Subscribed On/\{%s}/\From this IP" % \
               (self.email, self.subscribed, self.ip_addr)

    class Meta:
        unique_together = ('email', 'ip_addr')


class ContactUsModel(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4(), unique=True, editable=False)
    name = models.CharField(max_length=150, null=False)
    email = models.EmailField()
    body = models.TextField()
    ip_addr = models.CharField(null=False, max_length=250, default="")
    date = models.DateTimeField(default=timezone.now())
    objects = models.Manager()

    def __str__(self):
        return 'mail from {%s} | at {%s}' % (self.email, self.date)

    class Meta:
        unique_together = ('email', 'ip_addr')


def save_image(title, filename):
    return '{%s}-{%s}' % (title, filename)


class Post(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4(), unique=True, editable=False)
    title = models.CharField(max_length=250)
    body = models.TextField()
    main_image = models.ImageField(null=False, upload_to=save_image)
    second_image = models.ImageField(blank=True, default="")
    third_image = models.ImageField(blank=True, default="")
    fourth_image = models.ImageField(blank=True, default="")
    fifth_image = models.ImageField(blank=True, default="")
    created_at = models.DateTimeField(default=timezone.now())

    # get url

    def slug(self):
        return slugify(self.title)

    def get_absolute_url(self):
        return reverse('lp:post_detail', kwargs={'slug': self.slug(),
                                                 'pk': self.pk})

    def __str__(self):
        return '%s' % self.title

    class Meta:
        ordering = ['-created_at']

完全回溯

回溯（最近一次调用上次）：文件
“/venv/lib/python3.7/site packages/django/db/backends/utils.py”，
第86行，in_执行
返回self.cursor.execute（sql，params）psycopg2.errors.UniqueViolation:重复的键值违反唯一性
约束“lp_post_pkey”详细信息：键
（id）=（5de7b062-14b2-42ef-a9ee-95bbb17ccf3b）已存在

我的上两次迁移

class Migration(migrations.Migration):

    dependencies = [
        ('lp', '0008_auto_20191221_2016'),
    ]

    operations = [
        migrations.AlterField(
            model_name='contactusmodel',
            name='date',
            field=models.DateTimeField(default=datetime.datetime(2019, 12, 21, 20, 17, 10, 770047, tzinfo=utc)),
        ),
        migrations.AlterField(
            model_name='contactusmodel',
            name='id',
            field=models.UUIDField(default=uuid.UUID('37e52230-3c82-45eb-bbb9-aeb432b12247'), editable=False, primary_key=True, serialize=False, unique=True),
        ),
        migrations.AlterField(
            model_name='post',
            name='created_at',
            field=models.DateTimeField(default=datetime.datetime(2019, 12, 21, 20, 17, 10, 770612, tzinfo=utc)),
        ),
        migrations.AlterField(
            model_name='post',
            name='id',
            field=models.UUIDField(default=uuid.UUID('f4e05be4-2722-47b2-b636-232079114157'), editable=False, primary_key=True, serialize=False, unique=True),
        ),
        migrations.AlterField(
            model_name='subscribermodel',
            name='id',
            field=models.UUIDField(default=uuid.UUID('61b77cb5-5f33-4b8b-b235-83d3b10cc989'), editable=False, primary_key=True, serialize=False, unique=True),
        ),
        migrations.AlterField(
            model_name='subscribermodel',
            name='subscribed',
            field=models.DateTimeField(default=datetime.datetime(2019, 12, 21, 20, 17, 10, 741394, tzinfo=utc)),
        ),
    ]


class Migration(migrations.Migration):

    dependencies = [
        ('lp', '0007_auto_20191221_2004'),
    ]

    operations = [
        migrations.AlterField(
            model_name='contactusmodel',
            name='date',
            field=models.DateTimeField(default=datetime.datetime(2019, 12, 21, 20, 16, 18, 987126, tzinfo=utc)),
        ),
        migrations.AlterField(
            model_name='contactusmodel',
            name='id',
            field=models.UUIDField(default=uuid.UUID('fabeec4c-bdd0-443a-81e9-2ea0ba8c8f4b'), editable=False, primary_key=True, serialize=False, unique=True),
        ),
        migrations.AlterField(
            model_name='post',
            name='created_at',
            field=models.DateTimeField(verbose_name=datetime.datetime(2019, 12, 21, 20, 16, 18, 987702, tzinfo=utc)),
        ),
        migrations.AlterField(
            model_name='post',
            name='id',
            field=models.UUIDField(default=uuid.UUID('aafc7ac3-f48b-4a74-a9cd-2af3a8d3fcae'), editable=False, primary_key=True, serialize=False, unique=True),
        ),
        migrations.AlterField(
            model_name='subscribermodel',
            name='id',
            field=models.UUIDField(default=uuid.UUID('b9c2a42c-3265-4a13-af48-ff5db4f38d30'), editable=False, primary_key=True, serialize=False, unique=True),
        ),
        migrations.AlterField(
            model_name='subscribermodel',
            name='subscribed',
            field=models.DateTimeField(default=datetime.datetime(2019, 12, 21, 20, 16, 18, 958998, tzinfo=utc)),
        ),
    ]

您的问题是您正在将默认值设置为
uuid.uuid4（）
。这将在应用程序首次启动时创建一个id，然后尝试对每个帖子使用相同的id

解决方案是使用不带括号的
default=uuid.uuid4
。这将自动为每个记录执行函数，生成一个新的uuid