Django 错误中的MultipleObjectsReturned()

Question

我发布了下面的代码，当我尝试将此模型视为 http://127.0.0.1:8000/admin/ 中的对象时，我收到以下错误：

• 多个对象返回于 /admin/configuration/epemployeeposition/2/change/
  get() 返回了不止一个员工职位——它返回了超过 20 个！

有人知道如何解决这个问题吗？我将非常感谢您的帮助！

这是我的对象模型，在 models.py 中给我一个错误。为了创建这个模型，我使用 python manage.pyspectdb 从 postgres 数据库自动生成了它。我只删除了Meta类中的manage = False

postgres 数据库：

models.py：

class Epemployeeposition(models.Model):
    companyid = models.IntegerField(db_column='CompanyID', primary_key=True)  
    employeeid = models.IntegerField(db_column='EmployeeID')  
    linenbr = models.IntegerField(db_column='LineNbr')  
    isactive = models.BooleanField(db_column='IsActive')  
    positionid = models.CharField(db_column='PositionID', max_length=20, blank=True, null=True)  
    startdate = models.DateTimeField(db_column='StartDate', blank=True, null=True)  
    startreason = models.CharField(db_column='StartReason', max_length=3)  
    enddate = models.DateTimeField(db_column='EndDate', blank=True, null=True)  
    isterminated = models.BooleanField(db_column='IsTerminated')  
    termreason = models.CharField(db_column='TermReason', max_length=3, blank=True, null=True)  
    isrehirable = models.BooleanField(db_column='IsRehirable')  
    noteid = models.UUIDField(db_column='NoteID')  
    createdbyid = models.UUIDField(db_column='CreatedByID')  
    createdbyscreenid = models.CharField(db_column='CreatedByScreenID', max_length=8)  
    createddatetime = models.DateTimeField(db_column='CreatedDateTime')  
    lastmodifiedbyid = models.UUIDField(db_column='LastModifiedByID')  
    lastmodifiedbyscreenid = models.CharField(db_column='LastModifiedByScreenID', max_length=8)  
    lastmodifieddatetime = models.DateTimeField(db_column='LastModifiedDateTime')  
    tstamp = models.BinaryField()

    class Meta:
        db_table = 'EPEmployeePosition'
        unique_together = (('companyid', 'employeeid', 'linenbr'), ('noteid', 'companyid'),)

这是错误的完整回溯

追溯：

Traceback (most recent call last):
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/contrib/admin/options.py", line 683, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/utils/decorators.py", line 133, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/views/decorators/cache.py", line 62, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/contrib/admin/sites.py", line 242, in inner
    return view(request, *args, **kwargs)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/contrib/admin/options.py", line 1888, in change_view
    return self.changeform_view(request, object_id, form_url, extra_context)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/utils/decorators.py", line 46, in _wrapper
    return bound_method(*args, **kwargs)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/utils/decorators.py", line 133, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/contrib/admin/options.py", line 1745, in changeform_view
    return self._changeform_view(request, object_id, form_url, extra_context)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/contrib/admin/options.py", line 1768, in _changeform_view
    obj = self.get_object(request, unquote(object_id), to_field)
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/contrib/admin/options.py", line 861, in get_object
    return queryset.get(**{field.name: object_id})
  File "/home/descartes/source/bitserf/env/lib/python3.8/site-packages/django/db/models/query.py", line 499, in get
    raise self.model.MultipleObjectsReturned(
configuration.models.Epemployeeposition.MultipleObjectsReturned: get() returned more than one Epemployeeposition -- it returned more than 20!

这是管理面板中的样子

点击Epemployeeposition对象时出错（2）

Answer 1

我认为发生这种情况是因为对象存在重复值...

• 尝试删除数据

  manage flush

  并重新创建它，然后确保您的

  primary_key

  字段具有唯一值
• 或者从第一个字段中删除

  primary_key

  ，Django 将创建

  id

  列，这也将解决问题

Answer 2

我可以看到问题不在于 get ，您正在为同一条记录创建多个对象。尝试删除整个对象并尝试创建一个新对象。

Answer 3

我也遇到过这种情况。实际上，我使用 slug 而不是 id 来访问 post_detail，但碰巧我有多个具有类似 slug 的帖子，因此它返回多个对象。 看看这个错误： 多个对象返回于 /post/most-interesting-places-on-the-web/

get() 返回了多个帖子——它返回了 2 个！