feat: mioitem 返回 defect/defect_name/okcate 并优化 mio 详情 items 序列化

- MIOItemSerializer 新增 defect/defect_name/okcate,取数优先级 wm.defect>mb.defect,
  与 services.py 中 do_out/do_in 的取数逻辑保持一致
- MIOItemViewSet.select_related_fields 加 wm__defect/mb__defect 消除 N+1
- MIODetailSerializer.items 改用 MIOItemForMioDetailSerializer 轻量序列化器
  (仅含前端实际消费的 id/mio/material/material_/batch/count/pack_index),
  避开 MIOItemSerializer 中 assemb/mioitemw 的 N+1
- MIOViewSet.retrieve 时挂 Prefetch('item_mio') 进一步减少查询

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/inm/serializers.py

@@ -264,6 +264,21 @@ class MIOItemListSimpleSerializer(CustomModelSerializer):
         model = MIOItem
         fields = ["id", "mio", "material", "warehouse", "material_name", "warehouse_name", "batch", "count", "test_date", "count_notok"]
 
+
+class _MioDetailItemMaterialSerializer(CustomModelSerializer):
+    class Meta:
+        model = Material
+        fields = ["id", "name", "model"]
+
+
+class MIOItemForMioDetailSerializer(CustomModelSerializer):
+    """MIO 详情下挂的 items 用,仅含前端实际消费的字段"""
+    material_ = _MioDetailItemMaterialSerializer(source='material', read_only=True)
+
+    class Meta:
+        model = MIOItem
+        fields = ["id", "mio", "material", "material_", "batch", "count", "pack_index"]
+
 class MIOItemSerializer(CustomModelSerializer):
     warehouse_name = serializers.CharField(source='warehouse.name', read_only=True)
     material_ = MaterialSerializer(source='material', read_only=True)
@@ -273,11 +288,33 @@ class MIOItemSerializer(CustomModelSerializer):
     inout_date = serializers.DateField(source='mio.inout_date', read_only=True)
     test_user_name = serializers.CharField(source='test_user.name', read_only=True)
     mioitemw = MIOItemwSerializer(many=True, required=False)
+    defect = serializers.SerializerMethodField(label="缺陷")
+    defect_name = serializers.SerializerMethodField(label="缺陷名称")
+    okcate = serializers.SerializerMethodField(label="缺陷分类")
 
     class Meta:
         model = MIOItem
         fields = '__all__'
 
+    def _resolve_defect(self, obj):
+        if obj.wm_id and obj.wm.defect_id:
+            return obj.wm.defect
+        if obj.mb_id and obj.mb.defect_id:
+            return obj.mb.defect
+        return None
+
+    def get_defect(self, obj):
+        d = self._resolve_defect(obj)
+        return d.id if d else None
+
+    def get_defect_name(self, obj):
+        d = self._resolve_defect(obj)
+        return d.name if d else None
+
+    def get_okcate(self, obj):
+        d = self._resolve_defect(obj)
+        return d.okcate if d else None
+
     def to_representation(self, instance):
         ret = super().to_representation(instance)
         ret["price"] = None
@@ -424,7 +461,7 @@ class MIOOtherSerializer(CustomModelSerializer):
 
 
 class MIODetailSerializer(MIOListSerializer):
-    items = MIOItemSerializer(source='item_mio', many=True, read_only=True)
+    items = MIOItemForMioDetailSerializer(source='item_mio', many=True, read_only=True)
 
 
 class MIOItemTestSerializer(CustomModelSerializer):

apps/inm/views.py

@@ -7,7 +7,7 @@ from django.conf import settings
 from rest_framework import serializers
 from django.utils import timezone
 from rest_framework.response import Response
-from django.db.models import Sum
+from django.db.models import Sum, Prefetch
 
 from apps.inm.models import WareHouse, MaterialBatch, MIO, MIOItem, MIOItemw, Pack
 from apps.inm.serializers import (
@@ -153,6 +153,15 @@ class MIOViewSet(CustomModelViewSet):
                      'item_mio__a_mioitem__batch']
     data_filter = True
 
+    def get_queryset(self):
+        queryset = super().get_queryset()
+        if self.action == 'retrieve':
+            queryset = queryset.prefetch_related(Prefetch(
+                'item_mio',
+                queryset=MIOItem.objects.select_related('material'),
+            ))
+        return queryset
+
     @classmethod
     def lock_and_check_can_update(cls, mio:MIO):
         if not connection.in_atomic_block:
@@ -346,7 +355,7 @@ class MIOItemViewSet(CustomListModelMixin, BulkCreateModelMixin, BulkDestroyMode
     serializer_class = MIOItemSerializer
     retrieve_serializer_class = MioItemDetailSerializer
     create_serializer_class = MIOItemCreateSerializer
-    select_related_fields = ['warehouse', 'mio', 'material', 'test_user']
+    select_related_fields = ['warehouse', 'mio', 'material', 'test_user', 'wm__defect', 'mb__defect']
     filterset_fields = {
         "warehouse": ["exact"],
         "mio": ["exact"],