python - Django - 设置 AUTH_USER_MODEL
问题描述
我创建了一个名为 Django 的项目Backend
,并在其中创建了一个名为Tool
.
现在,我User
通过继承模型创建了一个模型,并使用该模型AbstractUser
创建了 2 个帐户。
class User(AbstractUser):
is_student = models.BooleanField(default=False)
is_mentor = models.BooleanField(default=False)
class Student(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
college = models.CharField(max_length=100)
...
class Mentor(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
...
我以这种方式更新了settings.py
in文件夹:Backend
AUTH_USER_MODEL = 'Tool.User'
makemigrations
和之后migrate
,我收到以下错误:
ValueError:无法解析相关模型“Tool.User”
追溯:
Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\core\management\base.py", line 316, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\core\management\base.py", line 353, in execute
output = self.handle(*args, **options)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\core\management\base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\core\management\commands\migrate.py", line 203, in handle
fake_initial=fake_initial,
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\migrations\executor.py", line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\migrations\executor.py", line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\migrations\executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\migrations\migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\migrations\operations\models.py", line 91, in database_forwards
schema_editor.create_model(model)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\backends\base\schema.py", line 263, in create_model
definition, extra_params = self.column_sql(model, field)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\backends\base\schema.py", line 157, in column_sql
db_params = field.db_parameters(connection=self.connection)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\models\fields\related.py", line 966, in db_parameters
return {"type": self.db_type(connection), "check": self.db_check(connection)}
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\models\fields\related.py", line 963, in db_type
return self.target_field.rel_db_type(connection=connection)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\models\fields\related.py", line 878, in target_field
return self.foreign_related_fields[0]
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\models\fields\related.py", line 632, in foreign_related_fields
return tuple(rhs_field for lhs_field, rhs_field in self.related_fields if rhs_field)
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\models\fields\related.py", line 619, in related_fields
self._related_fields = self.resolve_related_fields()
File "C:\Users\Sreekar Mouli\Documents\Mini Project\Backend\venv\lib\site-packages\django\db\models\fields\related.py", line 604, in resolve_related_fields
raise ValueError('Related model %r cannot be resolved' % self.remote_field.model)
解决方案
我已经清除了所有以前的迁移,删除了数据库并重新创建了它。当我运行makemigrations
andmigrate
时,它运行良好。
似乎以前的迁移存在一些问题。但是,它显示此错误令人困惑和奇怪。
ValueError:无法解析相关模型“Tool.User”
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