在另一个模型

Question

这里有关实地Django管理是我的模型：

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) 

我要看看设备管理页面上的位置查询字段。然而，Location与Device相关，而不是Host。

如何显示Location字段以按设备管理页面上的位置 - >主机过滤设备类？

Answer 1

你可以在list_filters链领域和使用的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) 

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更新按照意见

要筛选外键（讨论通过任何字段，包括链式关系），你应该检查提供自动完成的工具。例如：django-autocomplete-light。这将使你呈现这类小部件：