refector: 更新物料总量用update

apps/inm/services.py

@@ -2,6 +2,7 @@ from apps.inm.models import MIO, MIOItem, MaterialBatch
 from rest_framework.exceptions import ValidationError
 from django.db.models.aggregates import Sum
 from apps.wpm.services import do_out, do_in
+from apps.mtm.models import Material
 
 
 class InmService:
@@ -48,6 +49,7 @@ class InmService:
                 mb.save()
             else:
                 raise ValidationError('不支持的操作')
-            material.count = MaterialBatch.objects.filter(
+            material_count = MaterialBatch.objects.filter(
                 material=material).aggregate(total=Sum('count')).get('total', 0)
-            material.save()
+            Material.objects.filter(id=material.id).update(
+                count=material_count)