如何修复makemigrations命令错误？
如何修复makemigrations命令错误？
提问于 2021-04-18 21:58:42
我使用python 3.8和django 3.1.7
起初，我的models.py是这样的：
from django.db import models
class Topic(models.Model):
"""A topic the user is learning about"""
text = models.CharField(max_length=200)
date_added = models.DateTimeField(auto_now_add=True)
def __str__(self):
"""Return a string representation of the model."""
return self.text当我发布"python manage.py makemigrations learning_logs“时，效果很好。
但当我把代码改为：
from django.db import models
class Topic(models.Model):
"""A topic the user is learning about"""
text = models.CharField(max_length=200)
date_added = models.DateTimeField(auto_now_add=True)
def __str__(self):
"""Return a string representation of the model."""
return self.text
class Entry(models.Model):
"""Something specific learned about a topic"""
topic = models.ForeignKey(Topic)
text = models.TextField()
date_added = models.DateTimeField(auto_now_add=True)
class Meta:
verbose_name_plural = 'entries'
def __str__(self):
"""Return a string representation of the model."""
return self.text[:50] + "..."它给了我一个错误：
Traceback (most recent call last):
File "manage.py", line 22, in <module>
main()
File "manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/home/okab/.local/lib/python3.8/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
utility.execute()
File "/home/okab/.local/lib/python3.8/site-packages/django/core/management/__init__.py", line 377, in execute
django.setup()
File "/home/okab/.local/lib/python3.8/site-packages/django/__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "/home/okab/.local/lib/python3.8/site-packages/django/apps/registry.py", line 114, in populate
app_config.import_models()
File "/home/okab/.local/lib/python3.8/site-packages/django/apps/config.py", line 211, in import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
File "<frozen importlib._bootstrap>", line 991, in _find_and_load
File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 783, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/home/okab/Desktop/Test/Projects/learning_log/learning_logs/models.py", line 14, in <module>
class Entry(models.Model):
File "/home/okab/Desktop/Test/Projects/learning_log/learning_logs/models.py", line 16, in Entry
topic = models.ForeignKey(Topic)
TypeError: __init__() missing 1 required positional argument: 'on_delete'你能帮我一下吗?因为我看过了。我认为每个错误都有自己的解决方案。
回答 1
Stack Overflow用户
发布于 2021-04-18 22:09:12
在模型中，条目模型将主题行更改为
topic = models.ForeignKey(Topic, on_delete=models.CASCADE)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/67153780
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