feat: 批次关系链时创建新批次支持使用已有批次号

apps/wpm/models.py

@@ -12,6 +12,7 @@ from django.utils.translation import gettext_lazy as _
 from rest_framework.exceptions import ParseError
 from django.db.models import Count
 from django.db import transaction
+from django.db.models import Max
 
 # Create your models here.
 class SfLog(CommonADModel):
@@ -599,7 +600,8 @@ class BatchSt(BaseModel):
     """
     TN: 产品批次统计
     """
-    batch = models.TextField("批次号", unique=True, db_index=True)
+    batch = models.TextField("批次号", db_index=True)
+    version = models.IntegerField("版本号", default=1, db_index=True) 
     last_time = models.DateTimeField("最后操作时间", null=True, blank=True)
     data = models.JSONField("数据", default=list, blank=True)
     material_start = models.ForeignKey(Material, verbose_name="起始物料", on_delete=models.SET_NULL, null=True, blank=True)
@@ -607,22 +609,26 @@ class BatchSt(BaseModel):
     handover = models.ForeignKey(Handover, verbose_name='由何交接记录创建', on_delete=models.CASCADE, null=True, blank=True)
     mlog = models.ForeignKey(Mlog, verbose_name='由何日志创建', on_delete=models.CASCADE, null=True, blank=True)
 
+    class Meta:
+        unique_together = [("batch", "version")]
+        
     @classmethod
     def g_create(cls, batch:str, mio=None, handover=None, mlog=None, material_start=None):
         """
         创建新的批次
         """
-        if mio is None and handover is None and mlog is None and material_start is None:
+        if mio is None and handover is None and mlog is None:
             return cls.objects.get_or_create(batch=batch)
         else:
+            latest_version = 0
             # 带有来源的批次获取，需检查批次号是否可用
-            if cls.objects.filter(batch=batch).exists():
-                raise ParseError(f"{batch}-该批次号不可用")
+            if cls.objects.filter(batch=batch, version=0).exists():
+                latest_version = BatchSt.objects.filter(batch=batch).aggregate(Max("version"))["version__max"]
             if mio is None and handover is None and mlog is None:
                 raise ParseError("mio or handover or mlog must be provided")
-            ins = cls.objects.create(batch=batch, mio=mio, handover=handover, mlog=mlog, material_start=material_start)
+            ins = cls.objects.create(batch=batch, mio=mio, handover=handover, mlog=mlog, material_start=material_start, version=latest_version+1)
             return ins, True
-        
+    
     @classmethod
     @transaction.atomic
     def init_dag(cls, batch:str):