Django/Postgres迁移失败"django.db.utils.ProgrammingError:relation"django_site"不存在"

Question

有问题迁移Django 1.8.1项目

Operations to perform:
  Synchronize unmigrated apps: raven_contrib_django, staticfiles, found_dash, messages, allauth, humanize
  Apply all migrations: account, found_auth, sessions, admin, sites, auth, found_assets, contenttypes
Synchronizing apps without migrations:
  Creating tables...
    Creating table allauth_socialapp
    Creating table allauth_socialaccount
    Creating table allauth_socialtoken
    Running deferred SQL...
Raven is not configured (logging is disabled). Please see the documentation for more information.
Traceback (most recent call last):
  File "src/manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 390, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/found/env/local/lib/python2.7/site-packages/raven/contrib/django/management/__init__.py", line 41, in new_execute
    return original_func(self, *args, **kwargs)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 441, in execute
    output = self.handle(*args, **options)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 179, in handle
    created_models = self.sync_apps(connection, executor.loader.unmigrated_apps)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 317, in sync_apps
    cursor.execute(statement)
  File "/found/env/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "/found/env/local/lib/python2.7/site-packages/django/db/utils.py", line 97, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/found/env/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 62, in execute
    return self.cursor.execute(sql)
django.db.utils.ProgrammingError: relation "django_site" does not exist

它抱怨django_site说不存在.这是我的应用配置:

INSTALLED_APPS = (
    'django.contrib.sites',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',...

网站框架包括在内.只有在使用Postgres数据库时才会出现此错误,SQLite数据库工作正常.

数据库conf

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'found',
        'USER': 'found',
        'PASSWORD': 'xxx',
        'HOST': '127.0.0.1',
        'PORT': '5432',
    }
}

完整配置在这里.

./manage.py dbshell 进入数据库正常:

(env)deploy@w1:/found$ src/manage.py dbshell
Password for user found: 
psql (9.3.6)
SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256)
Type "help" for help.

found=> \dt
             List of relations
 Schema |       Name        | Type  | Owner 
--------+-------------------+-------+-------
 public | django_migrations | table | found
(1 row)

found=> 

运行 ./manage.py flush

(env)deploy@w1:/found$ src/manage.py flush
You have requested a flush of the database.
This will IRREVERSIBLY DESTROY all data currently in the 'found' database,
and return each table to an empty state.
Are you sure you want to do this?

    Type 'yes' to continue, or 'no' to cancel: yes
Traceback (most recent call last):
  File "src/manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 390, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 441, in execute
    output = self.handle(*args, **options)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/commands/flush.py", line 84, in handle
    self.emit_post_migrate(verbosity, interactive, database)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/commands/flush.py", line 105, in emit_post_migrate
    emit_post_migrate_signal(set(all_models), verbosity, interactive, database)
  File "/found/env/local/lib/python2.7/site-packages/django/core/management/sql.py", line 280, in emit_post_migrate_signal
    using=db)
  File "/found/env/local/lib/python2.7/site-packages/django/dispatch/dispatcher.py", line 201, in send
    response = receiver(signal=self, sender=sender, **named)
  File "/found/env/local/lib/python2.7/site-packages/django/contrib/sites/management.py", line 20, in create_default_site
    if not Site.objects.using(using).exists():
  File "/found/env/local/lib/python2.7/site-packages/django/db/models/query.py", line 586, in exists
    return self.query.has_results(using=self.db)
  File "/found/env/local/lib/python2.7/site-packages/django/db/models/sql/query.py", line 479, in has_results
    return compiler.has_results()
  File "/found/env/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 808, in has_results
    return bool(self.execute_sql(SINGLE))
  File "/found/env/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 837, in execute_sql
    cursor.execute(sql, params)
  File "/found/env/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "/found/env/local/lib/python2.7/site-packages/django/db/utils.py", line 97, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/found/env/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: relation "django_site" does not exist
LINE 1: SELECT (1) AS "a" FROM "django_site" LIMIT 1

Answer 1

问题是 Django 内部的。它没有考虑您的应用程序django_site在创建表时的依赖关系。

django.contrib.sites但是，您可以轻松地规避为依赖导致错误的应用程序创建迁移的问题。

通过以下方式解决这个问题：

src/manage.py makemigrations allauth

（现有迁移将导致稍后创建表，并在迁移的应用程序之间执行依赖性检查。）