Question

卡住我有一个数据库，当我尝试制作python manage.py migrate时，它会发出如下错误：

django.db.utils.IntegrityError: duplicate key value violates unique constraint "auth_permission_pkey"
DETAIL:  Key (id)=(241) already exists.

以下是完整错误：

Operations to perform:
  Apply all migrations: admin, auth, companyapp, contenttypes, djcelery, kombu_transport_django, loginapp, projectmanagement, recruitmentproject, sessions, smallproject
Running migrations:
  No migrations to apply.
Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
    utility.execute()
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/core/management/__init__.py", line 355, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/core/management/base.py", line 283, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/core/management/base.py", line 330, in execute
    output = self.handle(*args, **options)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 227, in handle
    self.verbosity, self.interactive, connection.alias, apps=post_migrate_apps, plan=plan,
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/core/management/sql.py", line 53, in emit_post_migrate_signal
    **kwargs
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/dispatch/dispatcher.py", line 193, in send
    for receiver in self._live_receivers(sender)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/contrib/auth/management/__init__.py", line 83, in create_permissions
    Permission.objects.using(using).bulk_create(perms)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/db/models/query.py", line 443, in bulk_create
    ids = self._batched_insert(objs_without_pk, fields, batch_size)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/db/models/query.py", line 1080, in _batched_insert
    inserted_id = self._insert(item, fields=fields, using=self.db, return_id=True)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/db/models/query.py", line 1063, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 1099, in execute_sql
    cursor.execute(sql, params)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/db/backends/utils.py", line 80, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
    return self.cursor.execute(sql, params)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/home/ubuntu/.local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
    return self.cursor.execute(sql, params)
django.db.utils.IntegrityError: duplicate key value violates unique constraint "auth_permission_pkey"
DETAIL:  Key (id)=(241) already exists.

Answer 1

我已经尝试了以上答案，但是这些并没有帮助我。

Django已内置命令来解决此问题。

python manage.py sqlsequencereset auth | python manage.py dbshell

在this blog post

中可以找到发生这种情况的原因以及上述命令的正确解释。

Answer 2

如果没有太多其他上下文，看起来您已经为模型添加了一个唯一约束，但是数据库中的行违反了此约束，因此迁移失败。因此，在您的数据库中，您有两行auth_permission_pkey == 241。

您需要删除或更改此行，使其唯一，然后重新运行迁移。

Answer 3

我先运行即可解决

从auth_permission_id_seq中选择last_value;

查看最新的序列号是什么（对我来说是80），然后将其设置为更大的值：

ALTER SEQUENCE auth_permission_id_seq重新启动为100；

Answer 4

您必须重置auth_permission_id_seq，因为它很可能低于最大值id

SELECT MAX(id)+1 FROM auth_permission
ALTER SEQUENCE auth_permission_id_seq RESTART WITH <result of previous cmd>;

其中100是MAX(id)+1。可能有一种方法可以在一个命令中执行此操作，但是我的SQL知识是有限的。

以下内容将向您显示序列号的当前值，而不是您必须设置的值（因为它可能与MAX(id)中的auth_permission相距很远）

SELECT last_value FROM auth_permission_id_seq;

当我将生产数据库的转储（仅数据）恢复到开发数据库时，我个人遇到相同的问题。

django.db.utils.IntegrityError：重复键值违反唯一约束“auth_permission_pkey”

4 个答案: