Django管理员将Field与另一个模型相关联

Question

以下是我的模特：

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看到位置查找字段。但是，Location与Device相比Host。

如何显示Location字段以按设置管理页面上的位置＆gt;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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中进行讨论

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：从Django 2.0开始，django-admin provides autocomplete fields与django-autocomplete-light开箱即用，代码较少。