【发布时间】：2021-01-26 04:53:34
【问题描述】：
我一直在对我的模型“课程”进行一些更改，突然我无法在我的 django 网站上使用我的模型和 MySql 数据库。 当我尝试在视图上使用它时出现此错误 （1054，“'字段列表'中的未知列'leçon_lesson.subject_id'”） 命令 makemigrations 和 migrate 工作正常，但仅在使用模型时会发生此错误 这是model.py
from django.db import models
from .validators import *
from scolarité.models.level import Level
from scolarité.models.subject import Subject
class Lesson(models.Model):
level = models.ForeignKey(Level,on_delete=models.CASCADE)
subject = models.ForeignKey(Subject,on_delete=models.CASCADE)
chapiter = models.CharField(max_length=200)
lesson = models.CharField(max_length=200)
skill = models.CharField(max_length=200)
vacations = models.IntegerField()
link = models.URLField(max_length=700,null=True,blank=True)
remarques = models.TextField(null=True,blank=True)
order = models.IntegerField()
created = models.DateTimeField(auto_now_add=True, auto_now=False)
updated = models.DateTimeField(auto_now=True)
state = models.BooleanField(default=False)
def __str__(self):
return self.lesson
views.py
#=========================== view lessons =====================
@login_required #use this to make the view accessible for logged in users only
def view_lessons_list(request,subject_id):
request.session['subject_id']= subject_id #assign subject id value to session
level = Level.objects.get(id=request.session['level_id']) #getting the level model
subject = Subject.objects.get(id=request.session['subject_id']) #getting the subject model
lessons = Lesson.objects.filter(subject=subject ,level=level) #filtering the lesson based on the chosen level and subject
context={'lessons':lessons,}
return render(request,'leçon/view_lessons_list.html',context)
回溯
Traceback (most recent call last):
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\core\handlers\exception.py", line 41, in inner
response = get_response(request)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\core\handlers\base.py", line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\core\handlers\base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\contrib\auth\decorators.py", line 23, in _wrapped_view
return view_func(request, *args, **kwargs)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\leçon\views.py", line 25, in view_lessons_list
return render(request,'leçon/view_lessons_list.html',context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\shortcuts.py", line 30, in render
content = loader.render_to_string(template_name, context, request, using=using)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\loader.py", line 68, in render_to_string
return template.render(context, request)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\backends\django.py", line 66, in render
return self.template.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 207, in render
return self._render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 199, in _render
return self.nodelist.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 990, in render
bit = node.render_annotated(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 957, in render_annotated
return self.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\loader_tags.py", line 177, in render
return compiled_parent._render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 199, in _render
return self.nodelist.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 990, in render
bit = node.render_annotated(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 957, in render_annotated
return self.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\loader_tags.py", line 177, in render
return compiled_parent._render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 199, in _render
return self.nodelist.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 990, in render
bit = node.render_annotated(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 957, in render_annotated
return self.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\loader_tags.py", line 72, in render
result = block.nodelist.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 990, in render
bit = node.render_annotated(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 957, in render_annotated
return self.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\defaulttags.py", line 173, in render
len_values = len(values)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\models\query.py", line 232, in __len__
self._fetch_all()
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\models\query.py", line 1102, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\models\query.py", line 53, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\models\sql\compiler.py", line 876, in execute_sql
cursor.execute(sql, params)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\backends\utils.py", line 80, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\backends\utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\utils\six.py", line 685, in reraise
raise value.with_traceback(tb)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\backends\utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\backends\mysql\base.py", line 101, in execute
return self.cursor.execute(query, args)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\cursors.py", line 250, in execute
self.errorhandler(self, exc, value)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\connections.py", line 50, in defaulterrorhandler
raise errorvalue
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\cursors.py", line 247, in execute
res = self._query(query)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\cursors.py", line 411, in _query
rowcount = self._do_query(q)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\cursors.py", line 374, in _do_query
db.query(q)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\connections.py", line 292, in query
_mysql.connection.query(self, query)
django.db.utils.OperationalError: (1054, "Unknown column 'leçon_lesson.subject_id' in 'field list'")
[11/Oct/2020 20:36:35] "GET /le%C3%A7on/view_lessons_list/18/ HTTP/1.1" 500 299785
我一直在尝试删除迁移文件和不同的 youtube 教程，但似乎没有什么对我有用，我不断收到不同的数据库错误，并从这个错误重新开始 这件事有什么解决方案或解决办法吗？这真的很令人沮丧，让我失望
【问题讨论】：
-
更改是否与
subject字段有关？您是否有任何机会进行手动迁移？ -
是的，我正在更改主题字段的名称
-
您的迁移似乎没有正常运行。字段名称未在数据库中更新。它仍然具有旧名称。您可以通过查询 MySQL 中表的列来验证这一点。
-
我总是遇到这个问题，每当我输入一个新名称时，它会出现与新名称相同的错误，这与它有关吗？
-
你可以运行
python manage.py showmigrations并发布结果吗？
标签： mysql django django-models django-views