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apps/emtiyazat/selector.py

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+from django.db.models import Sum
+
+from apps.emtiyazat.models import Emtiyazat as EmtiyazatModel, ArzeshEmtiyaz as ArzeshEmtiyazModel
+
+
+def get_arzesh_emtiyaz():
+    arzesh_obj = ArzeshEmtiyazModel.objects.filter().last()
+    return arzesh_obj.price
+
+
+def get_emtiyaz_mojri(cuser) -> int:
+    sum_credit = EmtiyazatModel.objects.filter(cuser=cuser).aggregate(Sum('credit'))
+    sum_debit = EmtiyazatModel.objects.filter(cuser=cuser).aggregate(Sum('debit'))
+
+    if sum_credit['credit__sum'] is None:
+        sum_credit['credit__sum'] = 0
+    if sum_debit['debit__sum'] is None:
+        sum_debit['debit__sum'] = 0
+
+    return sum_credit['credit__sum'] - sum_debit['debit__sum']