classAppVersionConfigAdmin(admin.ModelAdmin):""" Admin class for AppVersionConfig model """fields=('platform','version','expire_at','enabled')list_filter=['platform']classMeta(object):ordering=['-major_version','-minor_version','-patch_version']defget_list_display(self,__):""" defines fields to display in list view """return['platform','version','expire_at','enabled','created_at','updated_at']admin.site.register(AppVersionConfig,AppVersionConfigAdmin)