python 类名未定义

Question

im new to this language

this is my model.py where the class are declared

from django.db import models

from django.contrib.auth.models import AbstractUser

Create your models here.

class CustomUser(AbstractUser):

USER = (

('1','HOD'),

('2','STAFF'),

('3','STUDENT'),

)

user_type = models.CharField(choices=USER,max_length=50,default=1)
profile_pic = models.ImageField(upload_to='media/profile_pic')

# Create Course and session Model

class Course( models.Model ):
    name = models.CharField( max_length=100 )
    created_at = models.DateTimeField( auto_now_add=True )
    updated_at = models.DateTimeField( auto_now=True )

    def __str__(self):
        return self.name

class Session_Year( models.Model ):
    session_start = models.CharField( max_length=100 )
    session_end = models.CharField( max_length=100 )

    def __str__(self):
        return self.session_start + " To " + self.session_end

then i makemigrations and migrate it

and when i call it in admin,py

from django.contrib import admin

from .models import *

from django.contrib.auth.admin import UserAdmin

Register your models here.

class UserModel(UserAdmin):

list_display = ['username','user_type']

admin.site.register(CustomUser,UserModel)

admin.site.register(Course)

admin.site.register(Session_Year)

this happen

Watching for file changes with StatReloader

Exception in thread django-main-thread:

Traceback (most recent call last):

File "C:\Users\PC\AppData\Local\Programs\Python\Python312\Lib\threading.py", line 1052, in _bootstrap_inner

self.run()

File "C:\Users\PC\AppData\Local\Programs\Python\Python312\Lib\threading.py", line 989, in run

self.

target(*self.args, **self.kwargs)

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\venv\Lib\site-packages\django\utils\autoreload.py", line 64, in wrapper

fn(*args, **kwargs)

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\venv\Lib\site-packages\django\core\management\commands\runserver.py", line 125, in inner_run

autoreload.raise_last_exception()

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\venv\Lib\site-packages\django\utils\autoreload.py", line 87, in raise_last_exception

raise exception[1]

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\venv\Lib\site-packages\django\core\management_init

.py", line 394, in execute

autoreload.check_errors(django.setup)()

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\venv\Lib\site-packages\django\utils\autoreload.py", line 64, in wrapper

fn(*args, **kwargs)

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\venv\Lib\site-packages\django_

init

.py", line 24, in setup

apps.populate(settings.INSTALLED_APPS)

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\venv\Lib\site-packages\django\apps\registry.py", line 124, in populate

app_config.ready()

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\venv\Lib\site-packages\django\contrib\admin\apps.py", line 27, in ready

self.module.autodiscover()

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\venv\Lib\site-packages\django\contrib\admin_

init

.py", line 50, in autodiscover

autodiscover_modules("admin", register_to=site)

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\venv\Lib\site-packages\django\utils\module_loading.py", line 58, in autodiscover_modules

import_module("%s.%s" % (app_config.name, module_to_search))

File "C:\Users\PC\AppData\Local\Programs\Python\Python312\Lib\importlib_

init

.py", line 90, in import_module

return _bootstrap._gcd_import(name[level:], package, level)

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "<frozen importlib._bootstrap>", line 1381, in _gcd_import

File "<frozen importlib._bootstrap>", line 1354, in _find_and_load

File "<frozen importlib._bootstrap>", line 1325, in _find_and_load_unlocked

File "<frozen importlib._bootstrap>", line 929, in _load_unlocked

File "<frozen importlib._bootstrap_external>", line 994, in exec_module

File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed

File "C:\Users\PC\PycharmProjects\Yt-Student-Management-System\student_management_system\app\admin.py", line 13, in <module>

admin.site.register(Course)

^^^^^^

NameError: name 'Course' is not defined

the Course is not define

please help meee!

i try deleting the migrations and remigrate them and retyping but still no avail i really dont know

Answer 1

您似乎没有在 admin.py 中导入课程模型 使用前必须导入才能使用。

例如

# course/models.py
class Course(models.Model):
...

# app/admin.py
from course.models import Course

...

admin.site.register(Course)