例如，在Profile列表中想增加“用户名”列，user是Profile模型的外键。

class ProfileAdmin(admin.ModelAdmin):
    list_display = ('get_username', 'real_name', 'mobile')
    
    def get_username(self, obj):
        return obj.user.username
    get_username.short_description = '用户名'

更多参考：

http://stackoverflow.com/questions/163823/can-list-display-in-a-django-modeladmin-display-attributes-of-foreignkey-field

http://www.djangofoo.com/129/format-datetime-in-django-admin