我最初尝试将CharField“NewsItem.markdown”的名称更改为“NewsItem.name”并更改其最大长度。 我按照惯例进行迁移和迁移，但是这导致了一个错误，告诉我“main_NewsItem.markdown”不存在。
在努力解决这个问题后（刷新数据库，删除数据库并重新创建数据库等而不改变错误消息）我决定一起删除该模型并创建一个名为“News_item”的新模型。我再次按照惯例进行迁移和迁移。
这导致以下错误：
Environment:
Request Method: GET
Request URL: http://46.101.55.192/admin/main/newsitem/
Django Version: 2.0.2
Python Version: 3.5.2
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'main']
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']
Traceback:
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/backends/utils.py" in _execute
85. return self.cursor.execute(sql, params)
The above exception (relation "main_newsitem" does not exist
LINE 1: SELECT COUNT(*) AS "__count" FROM "main_newsitem"
^
) was the direct cause of the following exception:
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/core/handlers/exception.py" in inner
35. response = get_response(request)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/core/handlers/base.py" in _get_response
128. response =
self.process_exception_by_middleware(e, request)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/core/handlers/base.py" in _get_response
126. response = wrapped_callback(request,
*callback_args, **callback_kwargs)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/contrib/admin/options.py" in wrapper
574. return self.admin_site.admin_view(view)(*args,
**kwargs)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/utils/decorators.py" in _wrapped_view
142. response = view_func(request, *args,
**kwargs)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/views/decorators/cache.py" in _wrapped_view_func
44. response = view_func(request, *args, **kwargs)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/contrib/admin/sites.py" in inner
223. return view(request, *args, **kwargs)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/utils/decorators.py" in _wrapper
62. return bound_func(*args, **kwargs)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/utils/decorators.py" in _wrapped_view
142. response = view_func(request, *args,
**kwargs)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/utils/decorators.py" in bound_func
58. return func.__get__(self, type(self))(*args2,
**kwargs2)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/contrib/admin/options.py" in changelist_view
1570. cl = self.get_changelist_instance(request)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/contrib/admin/options.py" in get_changelist_instance
705. self,
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/contrib/admin/views/main.py" in __init__
77. self.get_results(request)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/contrib/admin/views/main.py" in get_results
175. result_count = paginator.count
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/utils/functional.py" in __get__
36. res = instance.__dict__[self.name] = self.func(instance)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/core/paginator.py" in count
85. return self.object_list.count()
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/models/query.py" in count
387. return self.query.get_count(using=self.db)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/models/sql/query.py" in get_count
491. number = obj.get_aggregation(using, ['__count'])
['__count']
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/models/sql/query.py" in get_aggregation
476. result = compiler.execute_sql(SINGLE)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/models/sql/compiler.py" in execute_sql
1064. cursor.execute(sql, params)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/backends/utils.py" in execute
100. return super().execute(sql, params)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/backends/utils.py" in execute
68. return self._execute_with_wrappers(sql, params,
many=False, executor=self._execute)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/backends/utils.py" in _execute_with_wrappers
77. return executor(sql, params, many, context)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/backends/utils.py" in _execute
85. return self.cursor.execute(sql, params)
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/utils.py" in __exit__
89. raise dj_exc_value.with_traceback(traceback)
from exc_value
File "/home/koan/koansite/koansiteenv/lib/python3.5/site-
packages/django/db/backends/utils.py" in _execute
85. return self.cursor.execute(sql, params)
Exception Type: ProgrammingError at /admin/main/newsitem/
Exception Value: relation "main_newsitem" does not exist
LINE 1: SELECT COUNT(*) AS "__count" FROM "main_newsitem"
^
这是main / models.py文件 来自django.db导入模型
class Image(models.Model):
name = models.CharField(max_length=30)
caption = models.CharField(max_length=1000)
def __unicode__(self):
return self.name
class Carousel(models.Model):
name = models.CharField(max_length=50, default='ineedaname')
images = models.ManyToManyField(Image)
def __unicode__(self):
return self.name
class News_item(models.Model):
name = models.CharField(max_length=50, default='ineedaname')
published_at = models.DateTimeField(auto_now=True)
def __unicode__(self):
return self.name + self.published_at
class Artist(models.Model):
name = models.CharField(max_length=100)
description = models.CharField(max_length=50000)
releases = models.ManyToManyField('Release', blank=True)
spotifylink = models.CharField(max_length=1000)
soundcloudlink = models.CharField(max_length=1000)
bandcamplink = models.CharField(max_length=1000)
applemusiclink = models.CharField(max_length=1000)
def __unicode__(self):
return self.name
class Release(models.Model):
title = models.CharField(max_length=200)
typevideotrack = models.CharField(max_length=50)
artists = models.ManyToManyField(Artist)
releasedate = models.DateField()
link = models.CharField(max_length=1000)
def __unicode__(self):
return self.title
我正在使用一个postgres数据库，我检查过的表格似乎都是正确的。
任何有关修复此问题的帮助都将受到赞赏。
由于