另一个模型上的 Django 管理员相关字段

Question

这是我的模型：

class Location(models.Model): 
    location_id = models.AutoField(primary_key=True)
    location = models.CharField(max_length=30, blank=False, null=False)

class Host(models.Model): 
    host_id = models.AutoField(primary_key=True)
    location = models.ForeignKey('Location', on_delete=models.PROTECT)
    host = models.CharField(max_length=30, blank=False, null=False)

class Device(models.Model):
    device_id = models.AutoField(primary_key=True)
    host = models.ForeignKey('Host', on_delete=models.PROTECT)
    model = models.ForeignKey('Model', on_delete=models.PROTECT)
    ip = models.GenericIPAddressField(null=True)
    name = models.CharField(max_length=30, blank=False, null=False)

这里是DeviceAdmin 类：

class DeviceAdmin(admin.ModelAdmin):
    list_display=('host','name','model', 'ip')
    list_filter=(
        ('model', admin.RelatedOnlyFieldListFilter),
        ('host', admin.RelatedOnlyFieldListFilter),
    )    
admin.site.register(Device, DeviceAdmin)

我需要在设备管理页面上查看位置查找字段。但是，Location 与 Device 的关系超过了 Host。

如何在设备管理页面上显示Location 字段以按位置->主机过滤设备类？

Answer 1

您可以在list_filters 中链接字段并在list_display 中使用ModelAdmin 方法：

class DeviceAdmin(admin.ModelAdmin):
    list_display = ('host', 'host_location', 'name', 'model', 'ip')
    list_filter = (
        ('model', admin.RelatedOnlyFieldListFilter),
        ('host', admin.RelatedOnlyFieldListFilter),
        'host__location',
    )

    def host_location(self, instance):
        return instance.host.location
    host_location.short_description = "Location"
    host_location.admin_order_field = 'host__location'
admin.site.register(Device, DeviceAdmin)

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更新在cmets讨论后

要过滤外键（通过其任何字段，包括链式关系），您应该检查提供自动完成功能的工具。例如：django-autocomplete-light。这将使您能够呈现此类小部件：

注意：自 Django 2.0 起，django-admin provides autocomplete fields 与django-autocomplete-light 一样，开箱即用，代码更少。