Django管理员将Field与另一个模型相关联

Question

这是我的模特:

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)

这是DeviceAdmin班级:

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Device Admin页面上看到Location lookup字段.然而,Location对有关Device过度Host.

如何Location通过"设备管理"页面上的"位置 - >主机" 显示字段来过滤设备类？

Answer 1

您可以链接字段list_filters并使用ModelAdmin方法list_display:

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)

在评论中讨论后更新

要过滤外键(通过其任何字段,包括链接关系),您应该检查提供自动完成的工具.例如:django-autocomplete-light.这将使您能够呈现这样的小部件:

注意:自Django 2.0以来,django-admin提供的自动填充字段与django-autocomplete-light开箱即用相同,代码更少.