polls/models.py内容:
from django.db import models # Create your models here. class Student(models.Model): sfid = models.IntegerField(primary_key=True) name = models.CharField(max_length=200) group = models.ForeignKey(Groupname, on_delete=models.CASCADE) # def __str__(self): # return self.name class Groupname(models.Model): group_name = models.CharField(max_length=200) # def __str__(self): # return self.group_name
运行python manage.py makemigrations polls出现以下错误
Traceback (most recent call last): File "manage.py", line 22, in <module> execute_from_command_line(sys.argv) File "/usr/install/python3/lib/python3.5/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line utility.execute() File "/usr/install/python3/lib/python3.5/site-packages/django/core/management/__init__.py", line 341, in execute django.setup() File "/usr/install/python3/lib/python3.5/site-packages/django/__init__.py", line 27, in setup apps.populate(settings.INSTALLED_APPS) File "/usr/install/python3/lib/python3.5/site-packages/django/apps/registry.py", line 108, in populate app_config.import_models(all_models) File "/usr/install/python3/lib/python3.5/site-packages/django/apps/config.py", line 199, in import_models self.models_module = import_module(models_module_name) File "/usr/install/python3/lib/python3.5/importlib/__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 986, in _gcd_import File "<frozen importlib._bootstrap>", line 969, in _find_and_load File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 673, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 665, in exec_module File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed File "/root/django_projects/mysite/polls/models.py", line 4, in <module> class Student(models.Model): File "/root/django_projects/mysite/polls/models.py", line 7, in Student group = models.ForeignKey(Groupname,on_delete=models.CASCADE) NameError: name 'Groupname' is not defined
到底咋回事,一直搞不懂! Groupname这个类明明存在啊!
将两个类的位置颠倒过来即可。或者将Groupname加上引号。