【发布时间】：2016-06-25 18:39:30
【问题描述】：
我正在使用 django 制作博客。我创建了一个名为 blog 的应用程序，并在 models.py 中为该博客上的文章创建了以下模型：
class Article(models.Model):
title = models.CharField(max_length = 100, unique=True)
slug = models.SlugField(max_length=100, unique=True)
author = models.CharField(max_length = 100)
COUNTRIES = (
("fr", "france"),
("ge", "germany"),
)
nationality = models.CharField(choices= COUNTRIES, max_length = 20)
publication_date = models.DateTimeField()
content = models.TextField()
def __unicode__(self):
return '%s' % self.title
@permalink
def get_absolute_url(self):
return ('view_article', None, { 'slug': self.slug })
在 admin.py 中，我做了以下操作，以便在 slug 中预先填充标题：
class ArticleAdmin(admin.ModelAdmin):
exclude = ['posted']
prepopulated_fields = {'slug': ('title',)}
我已经多次运行 python manage.py makemigrations 和 migrate，试图压缩迁移，正如我在此处的其他帖子中发现的那样。当我运行 makemigrations 时，我得到：“未检测到更改”。当我运行 migrate 时，我得到“没有要应用的迁移”。
但是，当我runserver 并进入管理界面以添加新文章时，填写“title”字段，看到自动填充的 slug 字段（由于预填充）并想要保存，这是我得到的：
Request Method: POST
Request URL: http://127.0.0.1:8000/admin/blog/article/add/
Django Version: 1.9.4
Python Version: 2.7.11
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'blog.apps.BlogConfig']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Traceback:
File "/Library/Python/2.7/site-packages/django/core/handlers/base.py" in get_response
149. response = self.process_exception_by_middleware(e, request)
File "/Library/Python/2.7/site-packages/django/core/handlers/base.py" in get_response
147. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/admin/options.py" in wrapper
541. return self.admin_site.admin_view(view)(*args, **kwargs)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in _wrapped_view
149. response = view_func(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
57. response = view_func(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/admin/sites.py" in inner
244. return view(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/admin/options.py" in add_view
1437. return self.changeform_view(request, None, form_url, extra_context)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in _wrapper
67. return bound_func(*args, **kwargs)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in _wrapped_view
149. response = view_func(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in bound_func
63. return func.__get__(self, type(self))(*args2, **kwargs2)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in inner
184. return func(*args, **kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/admin/options.py" in changeform_view
1370. if form.is_valid():
File "/Library/Python/2.7/site-packages/django/forms/forms.py" in is_valid
161. return self.is_bound and not self.errors
File "/Library/Python/2.7/site-packages/django/forms/forms.py" in errors
153. self.full_clean()
File "/Library/Python/2.7/site-packages/django/forms/forms.py" in full_clean
364. self._post_clean()
File "/Library/Python/2.7/site-packages/django/forms/models.py" in _post_clean
402. self.validate_unique()
File "/Library/Python/2.7/site-packages/django/forms/models.py" in validate_unique
411. self.instance.validate_unique(exclude=exclude)
File "/Library/Python/2.7/site-packages/django/db/models/base.py" in validate_unique
922. errors = self._perform_unique_checks(unique_checks)
File "/Library/Python/2.7/site-packages/django/db/models/base.py" in _perform_unique_checks
1017. if qs.exists():
File "/Library/Python/2.7/site-packages/django/db/models/query.py" in exists
651. return self.query.has_results(using=self.db)
File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py" in has_results
501. return compiler.has_results()
File "/Library/Python/2.7/site-packages/django/db/models/sql/compiler.py" in has_results
819. return bool(self.execute_sql(SINGLE))
File "/Library/Python/2.7/site-packages/django/db/models/sql/compiler.py" in execute_sql
848. cursor.execute(sql, params)
File "/Library/Python/2.7/site-packages/django/db/backends/utils.py" in execute
79. return super(CursorDebugWrapper, self).execute(sql, params)
File "/Library/Python/2.7/site-packages/django/db/backends/utils.py" in execute
64. return self.cursor.execute(sql, params)
File "/Library/Python/2.7/site-packages/django/db/utils.py" in __exit__
95. six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/Library/Python/2.7/site-packages/django/db/backends/utils.py" in execute
64. return self.cursor.execute(sql, params)
File "/Library/Python/2.7/site-packages/django/db/backends/sqlite3/base.py" in execute
323. return Database.Cursor.execute(self, query, params)
**Exception Type: OperationalError at /admin/blog/article/add/
Exception Value: no such column: blog_article.slug**
如果我在管理界面中单击“文章”，我会得到相同的结果。我试图压制迁移，进行迁移并再次迁移，但它没有奏效......我到处寻找并没有找到适合我的答案 - 如果你能提供一些提示，非常感谢你！
【问题讨论】：
-
Django 版本？你试过
python manage.py makemigrations blog，python manage.py migrate blog吗？ -
Django 版本是：(1, 9, 4, 'final', 0) 是的，我也尝试过这些命令，但它们并没有改变结果！
标签： python django database-migration slug