diff --git a/apps/wpm/models.py b/apps/wpm/models.py
index c5c7e53c..55b01cf0 100644
--- a/apps/wpm/models.py
+++ b/apps/wpm/models.py
@@ -108,8 +108,8 @@ class WMaterial(CommonBDModel):
     count_xtest = models.PositiveIntegerField('已检数量', null=True, blank=True)
 
     @property
-    def count_working(self, obj):
-        return Mlogb.objects.filter(wm_in=obj, mlog__work_end_time__isnull=True).aggregate(count=Sum('count'))['count'] or 0
+    def count_working(self):
+        return Mlogb.objects.filter(wm_in=self, mlog__work_end_time__isnull=True).aggregate(count=Sum('count'))['count'] or 0
 
 class Fmlog(CommonADModel):
     route = models.ForeignKey(Route, verbose_name='生产路线', on_delete=models.SET_NULL, null=True, blank=True)