perf: mlogb 列表预取 mlogbdefect 与 defect 消除 N+1

将 Mlogb.mlogbdefect 改为反向管理器 self.mlogbdefect_set.all() 以便 prefetch_related 命中缓存；MlogbViewSet 增加对 mlogbdefect_set + defect 的预取。

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

apps/wpm/models.py

@@ -510,7 +510,7 @@ class Mlogb(BaseModel):
     
     @property
     def mlogbdefect(self):
-        return MlogbDefect.objects.filter(mlogb=self)
+        return self.mlogbdefect_set.all()
 
     def cal_count_pn_jgqbl(self, cal_mlog=False):
         mqs = MlogbDefect.get_defect_qs_from_mlogb(self, ftype="in")

apps/wpm/views.py

@@ -765,6 +765,9 @@ class MlogbViewSet(CustomListModelMixin, CustomGenericViewSet):
     queryset = Mlogb.objects.all()
     serializer_class = MlogbDetailSerializer
     select_related_fields = ["material_out", "material_in", "test_user", "wm_in__defect"]
+    prefetch_related_fields = [
+        Prefetch("mlogbdefect_set", queryset=MlogbDefect.objects.select_related("defect")),
+    ]
     filterset_class = MlogbFilter
     ordering = ["create_time"]