feat: printing module

api_v1/views/stateflow/business_object.py

@@ -135,6 +135,26 @@ class BusinessObjectViewSet(viewsets.ModelViewSet):
                 'message': message
             }, status=status.HTTP_400_BAD_REQUEST)
     
+    @action(detail=True, methods=['post'])
+    def step_back(self, request, pk=None):
+        """回退一步（撤销最后一次完成的状态）"""
+        business_object = self.get_object()
+        user = request.user
+        
+        success, message = services.step_back_one_state(business_object, user)
+        
+        if success:
+            return Response({
+                'success': True,
+                'message': message,
+                'business_object': BusinessObjectDetailSerializer(business_object).data
+            })
+        else:
+            return Response({
+                'success': False,
+                'message': message
+            }, status=status.HTTP_400_BAD_REQUEST)
+    
     @action(detail=True, methods=['post'])
     def reset(self, request, pk=None):
         """重置进度"""