python - django admin list display sorting from many to many -


please me in solving issue tried lot unfortunately not find solution

my code under

models.py 

    class measuredcontroller(measuredobject):         .....         tempraturemeasure = models.manytomanyfield(measuredtemperature, blank=true, null=true)         .....       class measuredtemperature(measuredobject):         ......         temperature = models.decimalfield(max_digits=6,decimal_places=1,verbose_name='temperature[c]')         .....

admin.py 

    class measuredcontrolleradmin( admin.modeladmin):         list_display = ('tem0', 'tem1', 'tem2')          def tem2(self, obj):              ...............                return obj.tempraturemeasure.filter(deviceindex="2").latest("senddate").temperature             .......          def tem1(self, obj):              ...............                return obj.tempraturemeasure.filter(deviceindex="1").latest("senddate").temperature             .......          def tem0(self, obj):              ...............                return obj.tempraturemeasure.filter(deviceindex="0").latest("senddate").temperature             .......

my question possible make sorting on tem0, tem1, tem2 column in admin

you can creating sub queries, try this

class measuredcontrolleradmin( admin.modeladmin):     list_display = ('tem0', 'tem1', 'tem2')      def tem2(self, obj):          ...............            return obj.tempraturemeasure.filter(deviceindex="2").latest("senddate").temperature         .......      def tem1(self, obj):          ...............            return obj.tempraturemeasure.filter(deviceindex="1").latest("senddate").temperature         .......      def tem0(self, obj):          ...............            return obj.tempraturemeasure.filter(deviceindex="0").latest("senddate").temperature         .......      def get_queryset(self, request):         qs = super(measuredcontrolleradmin, self).get_queryset(request)         qs = qs.extra(         select = {              "tem2" : "<sub query selecting latest temp2>"),             "tem1" : "<sub query selecting latest temp1>"), sub query query selecting latest temp1"),             "temp0:"<sub query selecting latest temp0>")})  tem2.admin_order_field = 'tem2' tem1.admin_order_field = 'tem1' tem0.admin_order_field = 'tem0'

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