django 1.8.2：創建新內容類型時出錯

Question

我正在使用django 1.8.2，並且突然間我不能再使用migrate了。

我搜查了很多，發現this post暗示我應該從django_content_type表中刪除name。但該列不在django_content_type表中。

這裏是我的django_content_type表：

id |  app_label  |  model  
----+-------------------+---------------- 
    1 | admin    | logentry 
    2 | auth    | permission 
    3 | auth    | group 
    4 | auth    | user 
    5 | contenttypes  | contenttype 
    6 | sessions   | session 
    7 | centuryPhotograph | temporaryuser 
    8 | centuryPhotograph | userinfo 
    9 | centuryPhotograph | log 
10 | centuryPhotograph | uploadedimages 
(10 rows) 

這裏是完整的錯誤：

System check identified some issues: 

WARNINGS: 
centuryPhotograph.Galleries.closed: (1_6.W002) BooleanField does not have a default value. 
    HINT: Django 1.6 changed the default value of BooleanField from False to None. See https://docs.djangoproject.com/en/1.6/ref/models/fields/#booleanfield for more information. 
centuryPhotograph.Galleries.open_gallery: (1_6.W002) BooleanField does not have a default value. 
    HINT: Django 1.6 changed the default value of BooleanField from False to None. See https://docs.djangoproject.com/en/1.6/ref/models/fields/#booleanfield for more information. 
Operations to perform: 
    Apply all migrations: admin, centuryPhotograph, contenttypes, auth, sessions 
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 "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 385, in execute_from_command_line 
    utility.execute() 
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 377, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 288, in run_from_argv 
    self.execute(*args, **options.__dict__) 
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 338, in execute 
    output = self.handle(*args, **options) 
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/migrate.py", line 165, in handle 
    emit_post_migrate_signal(created_models, self.verbosity, self.interactive, connection.alias) 
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/sql.py", line 268, in emit_post_migrate_signal 
    using=db) 
    File "/usr/local/lib/python2.7/dist-packages/django/dispatch/dispatcher.py", line 198, in send 
    response = receiver(signal=self, sender=sender, **named) 
    File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/management/__init__.py", line 83, in create_permissions 
    ctype = ContentType.objects.db_manager(using).get_for_model(klass) 
    File "/usr/local/lib/python2.7/dist-packages/django/contrib/contenttypes/models.py", line 58, in get_for_model 
    " is migrated before trying to migrate apps individually." 
RuntimeError: Error creating new content types. Please make sure contenttypes is migrated before trying to migrate apps individually. 

這裏是我的INSTALLED_APPS：

INSTALLED_APPS = (
    'django.contrib.admin', 
    'django.contrib.auth', 
    'django.contrib.contenttypes', 
    'django.contrib.sessions', 
    'django.contrib.messages', 
    'django.contrib.staticfiles', 
    'centuryPhotograph', 
) 

我刪除了所有遷移一次，並試圖遷移，但問題仍然存在。

Answer 1

我在Django的1.9和麪臨張貼在評論同problem.The解決方案上面並沒有爲我工作，所以對張貼我工作：

1. 從所有的應用程序中刪除所有遷移文件夾。
2. 運行python manage.py migrate
3. 運行python manage.py makemigrations
4. 運行python manage.py migrate

這裏的關鍵是運行migrate一次以前運行makemigrations。一旦做到這一點contenttypes, admin, sites, auth, sessions等

，運行makemigrations這使得遷移爲您的項目中的自定義的車型：

這將運行在Django上的所有默認模式遷移像模型。

最後，當您再次運行遷移時，它會遷移您的所有自定義模型，並且不會抱怨在contenttype上沒有運行遷移。