django - 异常值 : column home_profile. 目标不存在

Question

我真的被困在这里，我有点困惑为什么会抛出这个错误。我正在运行 Django 1.10，实时数据库是一个 postgresql 数据库。我对postgres不太熟悉。为了灵 active ，我一直在使用 sqlite 进行所有开发工作。

我最近在我的模型中添加了两个新字段。它们都是 IntegerFields 我在本地没有遇到任何问题。我没有将我的更改部署到我的实时环境中，但我收到了上述错误。

goal = models.IntegerField(default=1, choices=weight_goal, null=True, blank=True)

我试过删除字段，删除所有迁移文件，甚至删除模型本身。但是，当我重新添加该字段时，它会抛出相同的错误。

我做了一些研究，我所看到的只是“删除数据库并重新创建它”。这是不可能的，因为我会丢失实时数据库中的所有数据。

我不太愿意深入实时数据库并尝试手动添加列。我的意思是，这似乎有点 OTT？

注意:我正在通过 Heroku 部署盒子

资料模型:

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)

    image = CloudinaryField('image', default="thumbnail_mqe6ne")
    weight = models.DecimalField(help_text="KG", max_digits=5, default=0, decimal_places=2, validators=[
        MinValueValidator(30),
        MaxValueValidator(600)
        ])
    height = models.DecimalField(help_text="CM", max_digits=8, default=0, decimal_places=2, validators=[
        MinValueValidator(20),
        MaxValueValidator(600),
        ])

    gender_option = (
        ('Male', 'Male'),
        ('Female', 'Female'),
    )

    profile_status = (
        ('Public', 'Public'),
        ('Private', 'Private'),
    )



    birth_date = models.DateField(blank=True, verbose_name="Date of Birth")


    gender = models.CharField(choices=gender_option, max_length=10)
    bio = models.TextField(max_length=300, blank=True)
    location = models.CharField(max_length=30, blank=True)


    weight_goal = (
        (1, 'Weight Loss'),
        (2, 'Weight / Muscle weight gain'),
    )

    goal = models.IntegerField(default=1, choices=weight_goal, null=True, blank=True)

    activity = (
        (1, 'Mostly inactive or sedentary'),
        (2, 'Fairly active'),
        (3, 'Moderately active'),
        (4, 'Active'),
        (5, 'Very active'),
    )


    activity_level = models.IntegerField(default=1, choices=activity, null=True, blank=True)


    intensity = (
        (1, 'Very light training'),
        (2, 'Moderate intensity'),
        (3, 'Moderate to high intensity (1 - 3 hours)'),
        (4, 'Very high intensity training (4+ Hours Daily)'),

    )


    training_intensity = models.IntegerField(default=1, choices=intensity)


    status = models.CharField(default="Public", max_length=10, choices=profile_status)

任何帮助将不胜感激。完整回溯如下:

Environment:


Request Method: GET
Request URL: /

Django Version: 1.10
Python Version: 2.7.13
Installed Applications:
['djangocms_admin_style',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.sites',
 'stats',
 'home',
 'blog',
 'haystack',
 'ckeditor_uploader',
 'ckeditor',
 'django_social_share',
 'post_office',
 'sorl.thumbnail',
 'storages',
 'cloudinary',
 'django.contrib.staticfiles',
 'cloudinary_storage',
 'django_cleanup',
 'django_instagram',
 'embed_video',
 'easy_thumbnails',
 'filer',
 'reversion',
 'allauth',
 'allauth.account',
 'allauth.socialaccount',
 'allauth.socialaccount.providers.facebook']
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.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'solid_i18n.middleware.SolidLocaleMiddleware',
 'whitenoise.middleware.WhiteNoiseMiddleware',
 'debug_toolbar.middleware.DebugToolbarMiddleware',
 'django.middleware.locale.LocaleMiddleware']



Traceback:

File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/exception.py" in inner
  39.             response = get_response(request)

File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/base.py" in _legacy_get_response
  249.             response = self._get_response(request)

File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/app/.heroku/python/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
  23.                 return view_func(request, *args, **kwargs)

File "/app/home/views.py" in get_user_profile
  42.     profile = Profile.objects.get(user=request.user.id)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/manager.py" in manager_method
  85.                 return getattr(self.get_queryset(), name)(*args, **kwargs)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/query.py" in get
  379.         num = len(clone)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/query.py" in __len__
  238.         self._fetch_all()

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/query.py" in _fetch_all
  1085.             self._result_cache = list(self.iterator())

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/query.py" in __iter__
  54.         results = compiler.execute_sql()

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in execute_sql
  835.             cursor.execute(sql, params)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
  79.             return super(CursorDebugWrapper, self).execute(sql, params)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
  64.                 return self.cursor.execute(sql, params)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/utils.py" in __exit__
  94.                 six.reraise(dj_exc_type, dj_exc_value, traceback)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
  64.                 return self.cursor.execute(sql, params)

Exception Type: ProgrammingError at /profile/
Exception Value: column home_profile.goal does not exist
LINE 1: ... "home_profile"."bio", "home_profile"."location", "home_prof...
                                                         ^

Answer 1

如果您还没有做的话，首先要做的是创建数据库备份。

database is a postgresql DB. I'm not that familiar with postgres. I've been doing all of my development work with sqlite for flexibility.

对于重要的项目，最好在两端使用相同的 RDBMS。

I've done some research and all i can see is 'Drop the DB and create it again"

你不走这条路是对的。这是非常糟糕的建议。

I have tried removing the fields, deleting all the migration files and even removing the model itself. However, when i add the field back in it throws the same error.

但这也是一条相当孤独和危险的道路，你走过了充满陷阱的道路。让我们看看是否可以解决问题。

postgresql 提示列丢失的事实清楚地表明你有一个流氓，迁移。检查你的备份，看看你是否有数据库的版本，有那一列。否则，您将丢失一些数据。

如果您有这样的备份，之后通过 psql 或 pgadmin 目视检查该列确实在数据库中丢失，然后恢复它。

现在您已经清除了迁移，完全清空该文件夹。确保没有任何挂起的 .pyc 文件。

接下来检查您的 django_migrations 表。删除与当前应用相关的迁移(我认为是 home)。

下一步

./manage.py makemigrations home

这应该会在您的迁移文件夹中创建一个迁移。确认后做

./manage.py migrate --fake-initial home

现在一切都应该没问题了。