Python Django:重复的键值违反了唯一约束_Python_Django_Postgresql_One To One

Python Django:重复的键值违反了唯一约束

python django postgresql

Python Django:重复的键值违反了唯一约束,python,django,postgresql,one-to-one,Python,Django,Postgresql,One To One,我有一个笑话模型： class Joke(models.Model): ... date_created = models.DateTimeField(default=datetime.now, blank=True) date_modified = models.DateTimeField(default=datetime.now, blank=True) creator = models.OneToOneField(User, default=1) 现在，当我尝试迁

我有一个笑话模型：

class Joke(models.Model):
...
    date_created = models.DateTimeField(default=datetime.now, blank=True)
    date_modified = models.DateTimeField(default=datetime.now, blank=True)
    creator = models.OneToOneField(User, default=1)

现在，当我尝试迁移最后一行时，会出现错误。基本上，我想将用户链接到笑话对象，因为我已经有了一个数据库，所以我希望默认值为1，这是管理员用户的id（我选中了…）。Makemigrations工作正常，但当我尝试迁移时，我得到以下结果：

Operations to perform:
  Apply all migrations: jokes_app, sessions, contenttypes, auth, taggit, default, admin
Running migrations:
  Rendering model states... DONE
  Applying jokes_app.0008_auto_20160723_1559...Traceback (most recent call last):
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
psycopg2.IntegrityError: duplicate key value violates unique constraint "jokes_app_joke_creator_id_key"
DETAIL:  Key (creator_id)=(1) already exists.


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
    utility.execute()
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/core/management/__init__.py", line 345, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/core/management/base.py", line 348, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/core/management/base.py", line 399, in execute
    output = self.handle(*args, **options)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 200, in handle
    executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/migrations/executor.py", line 92, in migrate
    self._migrate_all_forwards(plan, full_plan, fake=fake, fake_initial=fake_initial)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/migrations/executor.py", line 121, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/migrations/executor.py", line 198, in apply_migration
    state = migration.apply(state, schema_editor)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/migrations/migration.py", line 123, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/migrations/operations/fields.py", line 201, in database_forwards
    schema_editor.alter_field(from_model, from_field, to_field)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 482, in alter_field
    old_db_params, new_db_params, strict)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/postgresql/schema.py", line 110, in _alter_field
    new_db_params, strict,
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 644, in _alter_field
    [new_default],
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 110, in execute
    cursor.execute(sql, params)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py", line 79, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/utils.py", line 95, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/utils/six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
django.db.utils.IntegrityError: duplicate key value violates unique constraint "jokes_app_joke_creator_id_key"
DETAIL:  Key (creator_id)=(1) already exists.

要执行的操作：
应用所有迁移：应用程序、会话、内容类型、身份验证、标记、默认值、管理
运行迁移：
正在渲染模型状态。。。完成
应用程序0008\u auto\u 20160723\u 1559…回溯（最近一次呼叫最后一次）：
文件“/home/antoni4040/Documents/Jokes_-Website/django-Jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py”，执行中第64行
返回self.cursor.execute（sql，params）
psycopg2.IntegrityError:重复的键值违反唯一约束“笑话\u应用程序\u笑话\u创建者\u id\u键”
详细信息：密钥（创建者id）=（1）已存在。
上述异常是以下异常的直接原因：
回溯（最近一次呼叫最后一次）：
文件“/manage.py”，第10行，在
从命令行（sys.argv）执行命令
文件“/home/antoni4040/Documents/crooks\u Website/django-crooks/venv/lib/python3.4/site-packages/django/core/management/\uuuuuuuuuu-init\uuuuuuuuuuu.py”，第353行，从命令行执行
utility.execute（）
文件“/home/antoni4040/Documents/Jokes\u-Website/django-Jokes/venv/lib/python3.4/site-packages/django/core/management/__-init___;.py”，执行中第345行
self.fetch_命令（子命令）。从_argv（self.argv）运行_
文件“/home/antoni4040/Documents/Jokes\u Website/django Jokes/venv/lib/python3.4/site packages/django/core/management/base.py”，第348行，从\u argv运行
self.execute（*args，**cmd_选项）
文件“/home/antoni4040/Documents/Jokes_-Website/django-Jokes/venv/lib/python3.4/site-packages/django/core/management/base.py”，第399行，执行
输出=self.handle（*args，**选项）
文件“/home/antoni4040/Documents/Jokes_-Website/django-Jokes/venv/lib/python3.4/site-packages/django/core/management/commands/migrate.py”，第200行，在handle中
executor.migrate（目标、计划、假=假、假首字母=假首字母）
文件“/home/antoni4040/Documents/Jokes_-Website/django-Jokes/venv/lib/python3.4/site-packages/django/db/migrations/executor.py”，第92行，在migrate中
self.\u迁移\u所有\u转发（计划、完整计划、假=假、假首字母=假首字母）
文件“/home/antoni4040/Documents/Jokes\u Website/django Jokes/venv/lib/python3.4/site packages/django/db/migrations/executor.py”，第121行，全部转发
state=self.apply\u迁移（state，migration，false=false，false\u initial=false\u initial）
文件“/home/antoni4040/Documents/crooks\u网站/django-crooks/venv/lib/python3.4/site-packages/django/db/migrations/executor.py”，第198行，在apply\u-migration中
state=migration.apply（状态，模式编辑器）
文件“/home/antoni4040/Documents/Jokes_-Website/django-Jokes/venv/lib/python3.4/site-packages/django/db/migrations/migration.py”，第123行，应用
操作。数据库转发（self.app\u标签、模式编辑器、旧状态、项目状态）
数据库中第201行的文件“/home/antoni4040/Documents/Jokes\u网站/django Jokes/venv/lib/python3.4/site packages/django/db/migrations/operations/fields.py”
schema_editor.alter_字段（从_模型、从_字段到_字段）
文件“/home/antoni4040/Documents/Jokes\u网站/django-Jokes/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py”，第482行，在alter\u字段中
旧参数，新参数，严格）
文件“/home/antoni4040/Documents/Jokes\u Website/django Jokes/venv/lib/python3.4/site packages/django/db/backends/postgresql/schema.py”，第110行，在\u alter\u字段中
新的参数，严格的，
文件“/home/antoni4040/Documents/Jokes\u Website/django Jokes/venv/lib/python3.4/site packages/django/db/backends/base/schema.py”，第644行，在\u alter\u字段中
[新的默认值]，
文件“/home/antoni4040/Documents/Jokes_-Website/django-Jokes/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py”，第110行，执行
cursor.execute（sql，params）
文件“/home/antoni4040/Documents/Jokes_-Website/django-Jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py”，执行中第79行
返回super（CursorDebugWrapper，self）.execute（sql，params）
文件“/home/antoni4040/Documents/Jokes_-Website/django-Jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py”，执行中第64行
返回self.cursor.execute（sql，params）
文件“/home/antoni4040/Documents/Jokes_网站/django-Jokes/venv/lib/python3.4/site-packages/django/db/utils.py”，第95行，在出口处__
6.重新播放（dj_exc_类型、dj_exc_值、回溯）
文件“/home/antoni4040/Documents/Jokes_-Website/django-Jokes/venv/lib/python3.4/site-packages/django/utils/six.py”，第685行，以reraise显示
通过_回溯（tb）提升值
文件“/home/antoni4040/Documents/Jokes_-Website/django-Jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py”，执行中第64行
返回self.cursor.execute（sql，params）
django.db.utils.IntegrityError:重复的键值违反唯一约束“笑话\应用\笑话\创建者\ id \密钥”
详细信息：密钥（创建者id）=（1）已存在。

我真的不明白怎么了。有什么想法吗？

OneToOne字段，正如它的名字所说，强制执行一对一的关系，在您的情况下，这意味着一个用户可以创建一个且只有一个笑话-绝对不是您想要的。改用：

我绝对是个白痴。谢谢你，我正要把显示器扔出窗外。。。

    creator = models.ForeignKey(User, default=1, on_delete=models.SET_DEFAULT)