python之Django之一个模型不能有多个 AutoField

这个问题随机开始出现在我身上。我知道 Django 会生成自己的 ID，但我的很多代码一直在使用一直有效的自定义 AutoFields。我今天添加了一个新类并尝试进行迁移，但此错误一直出现。

我确实删除了 AutoFields 的所有实例并重试迁移，但问题仍然存在，这让我相信这是另外一回事......我认为我的 Django 版本根本没有改变......

错误:

    Traceback (most recent call last): 
  File "manage.py", line 10, in <module> 
    execute_from_command_line(sys.argv) 
  File "C:\Python34\lib\site-packages\django\core\management\__init__.py", line 
338, in execute_from_command_line 
    utility.execute() 
  File "C:\Python34\lib\site-packages\django\core\management\__init__.py", line 
330, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
  File "C:\Python34\lib\site-packages\django\core\management\base.py", line 390, 
 in run_from_argv 
    self.execute(*args, **cmd_options) 
  File "C:\Python34\lib\site-packages\django\core\management\base.py", line 441, 
 in execute 
    output = self.handle(*args, **options) 
  File "C:\Python34\lib\site-packages\django\core\management\commands\makemigrat 
ions.py", line 98, in handle 
    loader.project_state(), 
  File "C:\Python34\lib\site-packages\django\db\migrations\loader.py", line 326, 
 in project_state 
    return self.graph.make_state(nodes=nodes, at_end=at_end, real_apps=list(self 
.unmigrated_apps)) 
  File "C:\Python34\lib\site-packages\django\db\migrations\graph.py", line 231, 
in make_state 
    project_state = self.nodes[node].mutate_state(project_state, preserve=False) 
 
  File "C:\Python34\lib\site-packages\django\db\migrations\migration.py", line 8 
3, in mutate_state 
    operation.state_forwards(self.app_label, new_state) 
  File "C:\Python34\lib\site-packages\django\db\migrations\operations\fields.py" 
, line 51, in state_forwards 
    state.reload_model(app_label, self.model_name_lower) 
  File "C:\Python34\lib\site-packages\django\db\migrations\state.py", line 152, 
in reload_model 
    self.apps.render_multiple(states_to_be_rendered) 
  File "C:\Python34\lib\site-packages\django\db\migrations\state.py", line 262, 
in render_multiple 
    model.render(self) 
  File "C:\Python34\lib\site-packages\django\db\migrations\state.py", line 546, 
in render 
    body, 
  File "C:\Python34\lib\site-packages\django\db\models\base.py", line 189, in __ 
new__ 
    new_class.add_to_class(obj_name, obj) 
  File "C:\Python34\lib\site-packages\django\db\models\base.py", line 324, in ad 
d_to_class 
    value.contribute_to_class(cls, name) 
  File "C:\Python34\lib\site-packages\django\db\models\fields\__init__.py", line 
 989, in contribute_to_class 
    "A model can't have more than one AutoField." 
AssertionError: A model can't have more than one AutoField. 

这是我的领域之一的示例:

assetid = models.AutoField(primary_key=True) 

我的很多代码已经依赖于名称本身，因此更改名称将是一个大问题。此外，这之前工作得很好!我现在似乎无法迁移它。我应该提到我使用的是 sqlite3 数据库。

请您参考如下方法:

这是因为 Django 默认使用 AutoField 作为 id.....所以，如果您希望其他字段为 AutoField，请确保确认 primary_key=True。 这样做会从数据库中删除 id 字段。

我使用 Mysql 作为我的数据库。确保此问题在其他数据库中可能无法解决。