我正在用django 2的antonio mele为例创建一个博客应用程序。 我的主题是创建模型管理器。 但是，一旦我编辑了models.py文件，承载本地服务器的Power Shell窗口就会显示此错误：
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x03B61300>
Traceback (most recent call last):
File "C:\Users\public\django\my_env\lib\site-packages\django\utils\autoreload.py", line 225, in wrapper
fn(*args, **kwargs)
File "C:\Users\public\django\my_env\lib\site-packages\django\core\management\commands\runserver.py", line 109, in inne
r_run
autoreload.raise_last_exception()
File "C:\Users\public\django\my_env\lib\site-packages\django\utils\autoreload.py", line 248, in raise_last_exception
raise _exception[1]
File "C:\Users\public\django\my_env\lib\site-packages\django\core\management\__init__.py", line 337, in execute
autoreload.check_errors(django.setup)()
File "C:\Users\public\django\my_env\lib\site-packages\django\utils\autoreload.py", line 225, in wrapper
fn(*args, **kwargs)
File "C:\Users\public\django\my_env\lib\site-packages\django\__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Users\public\django\my_env\lib\site-packages\django\apps\registry.py", line 112, in populate
app_config.import_models()
File "C:\Users\public\django\my_env\lib\site-packages\django\apps\config.py", line 198, in import_models
self.models_module = import_module(models_module_name)
File "C:\Users\public\django\my_env\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\public\django\mysite\blog\models.py", line 1, in <module>
class PublishedManager(models.Manager):
NameError: name 'models' is not defined
这是 models.py 文件
上的代码class PublishedManager(models.Manager):
def get_queryset(self):
return super(PublishedManager,
self).get_queryset()\
.filter(status='published')
class Post(models.Model):
# ...
objects = models.Manager() # The default manager.
published = PublishedManager() # Our custom manager
@TDK无法确定“包含”的含义，但这是admin.py文件
from django.contrib import admin
from .models import Post
@admin.register(Post)
class PostAdmin(admin.ModelAdmin):
list_display = ('title', 'slug', 'author', 'publish',
'status')
list_filter = ('status', 'created', 'publish', 'author')
search_fields = ('title', 'body')
prepopulated_fields = {'slug': ('title',)}
raw_id_fields = ('author',)
date_hierarchy = 'publish'
ordering = ('status', 'publish')
@ Tony和Jonah，我添加了django.db导入模型中的代码 而且我也收到此错误消息
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x030233D8>
Traceback (most recent call last):
File "C:\Users\public\django\my_env\lib\site-packages\django\utils\autoreload.py", line 225, in wrapper
fn(*args, **kwargs)
File "C:\Users\public\django\my_env\lib\site-packages\django\core\management\commands\runserver.py", line 117, in inne
r_run
self.check(display_num_errors=True)
File "C:\Users\public\django\my_env\lib\site-packages\django\core\management\base.py", line 425, in check
raise SystemCheckError(msg)
django.core.management.base.SystemCheckError: SystemCheckError: System check identified some issues:
ERRORS:
<class 'blog.admin.PostAdmin'>: (admin.E108) The value of 'list_display[0]' refers to 'title', which is not a callable,
an attribute of 'PostAdmin', or an attribute or method on 'blog.Post'.
<class 'blog.admin.PostAdmin'>: (admin.E108) The value of 'list_display[1]' refers to 'slug', which is not a callable, a
n attribute of 'PostAdmin', or an attribute or method on 'blog.Post'.
<class 'blog.admin.PostAdmin'>: (admin.E108) The value of 'list_display[2]' refers to 'author', which is not a callable,
an attribute of 'PostAdmin', or an attribute or method on 'blog.Post'.
<class 'blog.admin.PostAdmin'>: (admin.E108) The value of 'list_display[3]' refers to 'publish', which is not a callable
, an attribute of 'PostAdmin', or an attribute or method on 'blog.Post'.
<class 'blog.admin.PostAdmin'>: (admin.E108) The value of 'list_display[4]' refers to 'status', which is not a callable,
an attribute of 'PostAdmin', or an attribute or method on 'blog.Post'.
System check identified 5 issues (0 silenced).
我真的分享了错误的models.py文件。
@ Daniel文件中的完整代码：
from django.db import models
class PublishedManager(models.Manager):
def get_queryset(self):
return super(PublishedManager,
self).get_queryset()\
.filter(status='published')
class Post(models.Model):
STATUS_CHOICES = (
('draft', 'Draft'),
('published', 'Published'),
)
title = models.CharField(max_length=250)
slug = models.SlugField(max_length=250,
unique_for_date='publish')
author = models.ForeignKey(User,
on_delete=models.CASCADE,
related_name='blog_posts')
body = models.TextField()
publish = models.DateTimeField(default=timezone.now)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
status = models.CharField(max_length=10,
choices=STATUS_CHOICES,
default='draft')
class Meta:
ordering = ('-publish',)
def __str__(self):
return self.title
# ...
objects = models.Manager() # The default manager.
published = PublishedManager() # Our custom manager
这是我现在收到的错误消息
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x036C1420>
Traceback (most recent call last):
File "C:\Users\public\django\my_env\lib\site-packages\django\utils\autoreload.py", line 225, in wrapper
fn(*args, **kwargs)
File "C:\Users\public\django\my_env\lib\site-packages\django\core\management\commands\runserver.py", line 109, in inne
r_run
autoreload.raise_last_exception()
File "C:\Users\public\django\my_env\lib\site-packages\django\utils\autoreload.py", line 248, in raise_last_exception
raise _exception[1]
File "C:\Users\public\django\my_env\lib\site-packages\django\core\management\__init__.py", line 337, in execute
autoreload.check_errors(django.setup)()
File "C:\Users\public\django\my_env\lib\site-packages\django\utils\autoreload.py", line 225, in wrapper
fn(*args, **kwargs)
File "C:\Users\public\django\my_env\lib\site-packages\django\__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Users\public\django\my_env\lib\site-packages\django\apps\registry.py", line 112, in populate
app_config.import_models()
File "C:\Users\public\django\my_env\lib\site-packages\django\apps\config.py", line 198, in import_models
self.models_module = import_module(models_module_name)
File "C:\Users\public\django\my_env\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\public\django\mysite\blog\models.py", line 9, in <module>
class Post(models.Model):
File "C:\Users\public\django\mysite\blog\models.py", line 17, in Post
author = models.ForeignKey(User,
NameError: name 'User' is not defined
答案 0 :(得分：0)
我猜您尚未导入models代码：
from django.db import models
答案 1 :(得分：0)
正如我在评论中提到的那样，您可能忘记了包含
from django.db import models
现在该错误消失了，看来您也需要
from django.contrib.auth.models import User