django.db.utils.IntegrityError:重复的键值违反了唯一约束“auth_permission_pkey”

Question

卡住了，我有一个数据库，当我试图让python manage.py 迁移时，它给出了这个错误，如下所示：

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

以下是整个错误：

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

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

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

其中 100 是最大（id） 1。可能有一种方法可以在一个命令中执行此操作，但我的SQL知识有限。

下面将向您显示序列号的当前值，而不是您必须设置的值(因为它可能远远偏离< code>auth_permission中的< code>MAX(id))

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，我个人也遇到了同样的问题。

Answer 2

我通过第一次跑步解决了这个问题

从auth_permission_id_seq中选择last _ value

为了查看最新的序列号是什么（对我来说是80），我将其设置为更大的值：

从100开始重新启动；

Answer 3

我已经尝试了上面的答案，但是那些对我没有帮助。

Django已经内置了解决这个问题的命令。

python manage . py SQL sequence set auth | python manage . py dbshell

正确的解释为什么会出现这种情况以及上述命令的作用都可以在这篇博文中找到