feat: material list filter low_inm优化

apps/mtm/filters.py

@@ -2,13 +2,11 @@ from django_filters import rest_framework as filters
 from apps.mtm.models import Goal, Material, Route, RoutePack
 from django.db.models.expressions import F
 from rest_framework.exceptions import ParseError
-
+from django.db.models import Sum, Q, Value, F, ExpressionWrapper, DecimalField
+from django.db.models.functions import Coalesce
 
 class MaterialFilter(filters.FilterSet):
     tag = filters.CharFilter(method='filter_tag', label="low_inm:库存不足")
-    count__gt = filters.NumberFilter(field_name='count', lookup_expr='gt')
-    count_mb__gt = filters.NumberFilter(field_name='count_mb', lookup_expr='gt')
-    count_wm__gt = filters.NumberFilter(field_name='count_wm', lookup_expr='gt')
 
     class Meta:
         model = Material
@@ -30,7 +28,7 @@ class MaterialFilter(filters.FilterSet):
 
     def filter_tag(self, queryset, name, value):
         if value == 'low_inm':
-            queryset = queryset.exclude(count_safe=None).exclude(count_safe__lte=0).filter(
+            queryset = Material.annotate_count(queryset.exclude(count_safe=None).exclude(count_safe__lte=0)).filter(
                 count__lte=F('count_safe'))
         return queryset
 

apps/mtm/models.py

@@ -6,6 +6,8 @@ from collections import defaultdict, deque
 from django.db.models import Q
 from datetime import datetime, timedelta
 from django.utils import timezone
+from django.db.models import Sum, Q, Value, F, ExpressionWrapper, DecimalField
+from django.db.models.functions import Coalesce
 
 class Process(CommonBModel):
     """
@@ -123,6 +125,25 @@ class Material(CommonAModel):
     def  fname(self):
         return f'{self.name}|{self.specification if self.specification else ""}|{self.model if self.model else ""}|{self.process.name if self.process else ""}'
 
+    @staticmethod
+    def annotate_count(qs):
+        return qs.annotate(
+                count_mb=Coalesce(
+                    Sum('mb_m__count', filter=Q(mb_m__state=10, mb_m__count__gt=0)), 
+                    Value(0),
+                    output_field=DecimalField()
+                ),
+                count_wm=Coalesce(
+                    Sum('wm_m__count', filter=Q(wm_m__state=10, wm_m__count__gt=0)), 
+                    Value(0),
+                    output_field=DecimalField()
+                )
+            ).annotate(
+                count=ExpressionWrapper(
+                    F('count_wm') + F('count_mb'),
+                    output_field=DecimalField()
+                )
+            )
     
 class Shift(CommonBModel):
     """TN:班次

apps/mtm/serializers.py

@@ -38,13 +38,15 @@ class MaterialSerializer(CustomModelSerializer):
     count = serializers.SerializerMethodField()
 
     def get_count_mb(self, obj):
-        return getattr(obj, 'count_mb', 0)
+        return getattr(obj, 'count_mb', None)
 
     def get_count_wm(self, obj):
-        return getattr(obj, 'count_wm', 0)
+        return getattr(obj, 'count_wm', None)
 
     def get_count(self, obj):
+        if hasattr(obj, 'count_mb') and hasattr(obj, 'count_wm'):
             return getattr(obj, 'count_mb', 0) + getattr(obj, 'count_wm', 0)
+        return None
 
     class Meta:
         model = Material

apps/mtm/views.py

@@ -45,23 +45,7 @@ class MaterialViewSet(CustomModelViewSet):
     def get_queryset(self):
         qs = super().get_queryset()
         if self.action in ["list", "retrieve"] and self.request.query_params.get('wiith_count', None) == 'yes':
-            return qs.annotate(
+            return Material.annotate_count(qs)
-                count_mb=Coalesce(
-                    Sum('mb_m__count', filter=Q(mb_m__state=10, mb_m__count___gt=0)), 
-                    Value(0),
-                    output_field=DecimalField()
-                ),
-                count_wm=Coalesce(
-                    Sum('wm_m__count', filter=Q(wm_m__state=10, wm_m__count___gt=0)), 
-                    Value(0),
-                    output_field=DecimalField()
-                )
-            ).annotate(
-                count=ExpressionWrapper(
-                    F('count_wm') + F('count_mb'),
-                    output_field=DecimalField()
-                )
-            )
         return qs
     
     def perform_destroy(self, instance):