Question

如何在django admin中对不存在的字段进行排序。基本上我有服务器和应用程序模型与第三关系模型链接它们。我看到了您的回复，但不确定在哪里放置您提到的代码。这是模型和admin.py

# Model.py File
class Server(models.Model):
name = models.CharField(max_length=100,  unique=True)
operating_system = models.CharField(max_length=20, choices=constants.OPERATING_SYSTEMS.items())

@property
def number_of_apps(self):
    return ServerApplicationRelationship.objects.filter(server=self).count()

class Application(models.Model):
    name = models.CharField(max_length=100,  unique=True)
hosted_on = models.ManyToManyField(Server, through='ServerApplicationRelationship', blank=True,)

@property
def number_of_servers(self):
    return ServerApplicationRelationship.objects.filter(app=self).count()
# number_of_servers.server_field = 'server__count'

class ServerApplicationRelationship(models.Model):
    server = models.ForeignKey(Server, blank=True, )
    # server_tag = models.ForeignKey(Server, through_fields= 'tags')
    app = models.ForeignKey(Application, blank=True)

# Admin.py file
@admin.register(Application)
class ApplicationAdmin(admin.ModelAdmin):


    inlines = [ApplicationInLine]
    list_display = ['name', 'number_of_servers']
    list_display_links = ['name', 'number_of_servers']

    ordering = ('number_of_servers', 'name')

@property
def number_of_apps(self):
    queryset = ServerAppRelation.objects.filter(server=self).count()
    return queryset

如果我在number_of_servers中加入ordering。我收到错误

    ERRORS:
<class 'S5.admin.ApplicationAdmin'>: (admin.E033) The value of 'ordering[0]' refers to 'number_of_server', which is not an attribute of 'S5.Appl
ication'

number_of_server显示在表格的列中，但不可排序。我怎样才能让它排序？

非常感谢

Answer 1

首先，您需要覆盖select Case when Remainder (rownum,3)=0 then 'Fizz' when Remainder (rownum,5)=0 then 'Buzz' when (remainder (rownum,3)=0 and remainder(ROWNUM,5) = 0) then 'FizzBuzz' else to_char(rownum) end from DUAL Connect by level <=100;方法，并使用服务器数量对其进行注释。

不幸的是，您无法在get_queryset中包含带注释的字段，因为它无法通过Django系统检查。因此，您定义一个返回带注释字段的方法，并在list_display中包含该方法。

最后，要使列可订购，您需要在方法上设置list_display属性。

admin_order_field

如何在django admin中对不存在的字段进行排序/排序

1 个答案: