溯源码分组查询去重

yudao-module-farm/src/main/java/cn/iocoder/yudao/module/farm/dal/mysql/traceabilitycode/TraceabilityCodeMapper.java

@@ -8,8 +8,7 @@ import cn.iocoder.yudao.module.farm.dal.dataobject.traceabilitycode.Traceability
 import org.apache.ibatis.annotations.Mapper;
 import org.apache.ibatis.annotations.Param;
 
-import java.util.Collections;
-import java.util.List;
+import java.util.*;
 import java.util.stream.Collectors;
 
 /**
@@ -108,8 +107,34 @@ public interface TraceabilityCodeMapper extends BaseMapperX<TraceabilityCodeDO>
             return new PageResult<>(Collections.emptyList(), 0L);
         }
         
+        // 按CodeOutBatch去重，确保每个批次只保留一条记录（保留最新的）
+        Map<String, TraceabilityCodeDO> uniqueBatchMap = latestRecords.stream()
+                .filter(record -> record.getCodeOutBatch() != null) // 过滤掉批次为空的记录
+                .collect(Collectors.toMap(
+                        TraceabilityCodeDO::getCodeOutBatch,
+                        record -> record,
+                        (existing, replacement) -> {
+                            // 如果存在重复批次，保留创建时间更新的记录
+                            if (replacement.getCreateTime() != null && existing.getCreateTime() != null) {
+                                return replacement.getCreateTime().isAfter(existing.getCreateTime()) ? replacement : existing;
+                            }
+                            return existing.getCreateTime() != null ? existing : replacement;
+                        }
+                ));
+        
+        // 转换为去重后的列表
+        List<TraceabilityCodeDO> uniqueRecords = new ArrayList<>(uniqueBatchMap.values());
+        
+        // 按创建时间倒序排序
+        uniqueRecords.sort((a, b) -> {
+            if (a.getCreateTime() == null && b.getCreateTime() == null) return 0;
+            if (a.getCreateTime() == null) return 1;
+            if (b.getCreateTime() == null) return -1;
+            return b.getCreateTime().compareTo(a.getCreateTime());
+        });
+        
         // 提取ID列表
-        List<String> ids = latestRecords.stream()
+        List<String> ids = uniqueRecords.stream()
                 .map(TraceabilityCodeDO::getId)
                 .collect(Collectors.toList());