我在models.py中为我的Django应用实现了一个模型。一切正常。然后，我尝试向模型添加一个新字段。如果现在运行“ makemigrations”，则会出现错误“表movieapp_movie_class没有名为show_movie的列”。我以为运行makemigrations是将此列添加到表中的命令。
我尝试删除db.sqlite3和迁移在应用程序文件夹中的文件夹，但这些文件夹无效。
from django.db import models
# Create your models here.
class movie_class(models.Model):
show_movie = models.CharField(max_length=100) # this is the new property I wanted to add
movie_id = models.CharField(max_length=100)
title = models.CharField(max_length=100)
rating = models.CharField(max_length=100)
poster = models.CharField(max_length=100)
跟踪：
(movies) C:\Users\wolfg\Desktop\Django\tiliter_challenge>python manage.py makemigrations
Traceback (most recent call last):
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\backends\sqlite3\base.py", line 383, in execute
return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: table movieapp_movie_class has no column named show_movie
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 21, in <module>
main()
File "manage.py", line 17, in main
execute_from_command_line(sys.argv)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\core\management\base.py", line 361, in execute
self.check()
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\core\management\base.py", line 390, in check
include_deployment_checks=include_deployment_checks,
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\core\management\base.py", line 377, in _run_checks
return checks.run_checks(**kwargs)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\core\checks\registry.py", line 72, in run_checks
new_errors = check(app_configs=app_configs)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\core\checks\urls.py", line 13, in check_url_config
return check_resolver(resolver)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\core\checks\urls.py", line 23, in check_resolver
return check_method()
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\urls\resolvers.py", line 398, in check
for pattern in self.url_patterns:
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\utils\functional.py", line 80, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\urls\resolvers.py", line 579, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\utils\functional.py", line 80, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\urls\resolvers.py", line 572, in urlconf_module
return import_module(self.urlconf_name)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\importlib\__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\wolfg\Desktop\Django\tiliter_challenge\tiliter_challenge\urls.py", line 18, in <module>
from movieapp.views import movieView, search_movie
File "C:\Users\wolfg\Desktop\Django\tiliter_challenge\movieapp\views.py", line 13, in <module>
new_item.save()
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\models\base.py", line 741, in save
force_update=force_update, update_fields=update_fields)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\models\base.py", line 779, in save_base
force_update, using, update_fields,
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\models\base.py", line 870, in _save_table
result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\models\base.py", line 908, in _do_insert
using=using, raw=raw)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\models\query.py", line 1186, in _insert
return query.get_compiler(using=using).execute_sql(return_id)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\models\sql\compiler.py", line 1335, in execute_sql
cursor.execute(sql, params)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\backends\utils.py", line 99, in execute
return super().execute(sql, params)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\backends\utils.py", line 67, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\backends\utils.py", line 76, in _execute_with_wrappers
return executor(sql, params, many, context)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\wolfg\Anaconda3\envs\movies\lib\site-packages\django\db\backends\sqlite3\base.py", line 383, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: table movieapp_movie_class has no column named show_movie