在Django ModelAdmin中推进queryset。 AttributeError:'dict'对象没有属性'_meta' - python

我编写的应用程序具有一个角色不同的模型用户。

因此，分配角色后，我在用户模型“ user_type”中添加了一个字段。

下面是我的用户模型。

class User(models.Model):
    name = models.CharField(max_length=30)
    password = models.CharField(max_length=250)
    gender = models.CharField(max_length=10)
    user_type = models.CharField(max_length=10, choices=USER_TYPE_CHOICE)

一切正常。我可以从Django管理站点进行操作。

现在，我想在Django admin中显示用户数。

为此，我尝试自定义Django ModelAdmin类。

以下是代码。

class UserCount(User):

    class Meta:
        proxy = True


class UserCountAdmin(admin.ModelAdmin):

    list_display = ("user_type", "count")

    def get_queryset(self, request):

        return User.objects.all().values("user_type").annotate(count=Count("user_type"))


admin.register(User)
admin.register(UserCount, UserCountAdmin)

我得到一个错误

AttributeError：'dict'对象没有属性'_meta'

我还检查了互联网上的错误，我在Django问题中发现了相同的问题，但由于状态无效而被关闭。
https://code.djangoproject.com/ticket/24387

错误回溯：

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/django/core/handlers/exception.py", line 39, in inner
    response = get_response(request)
  File "/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 217, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 215, in _get_response
    response = response.render()
  File "/usr/local/lib/python2.7/site-packages/django/template/response.py", line 109, in render
    self.content = self.rendered_content
  File "/usr/local/lib/python2.7/site-packages/django/template/response.py", line 86, in rendered_content
    content = template.render(context, self._request)
  File "/usr/local/lib/python2.7/site-packages/django/template/backends/django.py", line 66, in render
    return self.template.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 208, in render
    return self._render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 199, in _render
    return self.nodelist.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/loader_tags.py", line 174, in render
    return compiled_parent._render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 199, in _render
    return self.nodelist.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/loader_tags.py", line 174, in render
    return compiled_parent._render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 199, in _render
    return self.nodelist.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/loader_tags.py", line 70, in render
    result = block.nodelist.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/loader_tags.py", line 70, in render
    result = block.nodelist.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/usr/local/lib/python2.7/site-packages/django/template/library.py", line 225, in render
    _dict = self.func(*resolved_args, **resolved_kwargs)
  File "/usr/local/lib/python2.7/site-packages/django/contrib/admin/templatetags/admin_list.py", line 339, in result_list
    'results': list(results(cl))}
  File "/usr/local/lib/python2.7/site-packages/django/contrib/admin/templatetags/admin_list.py", line 315, in results
    yield ResultList(None, items_for_result(cl, res, None))
  File "/usr/local/lib/python2.7/site-packages/django/contrib/admin/templatetags/admin_list.py", line 306, in __init__
    super(ResultList, self).__init__(*items)
  File "/usr/local/lib/python2.7/site-packages/django/contrib/admin/templatetags/admin_list.py", line 217, in items_for_result
    f, attr, value = lookup_field(field_name, result, cl.model_admin)
  File "/usr/local/lib/python2.7/site-packages/django/contrib/admin/utils.py", line 272, in lookup_field
    opts = obj._meta
AttributeError: 'dict' object has no attribute '_meta'

请帮助我如何显示带有值的queryset中的数据。

参考方案

我认为您的问题是：

您正在尝试注释user_type列表，而应该注释QuerySet。
您要返回values，而必须从QuerySet返回get_queryset

试试这样的事情：

def get_queryset(self, request):
        return User.objects.all().annotate(count=Count("user_type"))

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