添加了新的交接接口，完善了Task的childrenCount，修复了更新staffPositions失败的问题

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/controller/ProjectGroupController.java

@@ -96,7 +96,7 @@ public class ProjectGroupController {
             @PathVariable Integer staffId,
             @Parameter(description = "在body中只传projectStaffPosition") @RequestBody GroupPositionVO groupPosition
     ) {
-        if (projectGroupService.updateStaffPositions(token, staffId, projectId, groupPosition.getProjectStaffPosition())) {
+        if (projectGroupService.updateStaffPositions(token, projectId, staffId, groupPosition.getProjectStaffPosition())) {
             return ResponseMap.ofSuccess();
         }
         throw new BadRequestException(BadRequestException.OPERATE_FAILED);
@@ -139,4 +139,20 @@ public class ProjectGroupController {
         }
         throw new BadRequestException(BadRequestException.OPERATE_FAILED);
     }
+
+    //TODO: TEST
+    @Operation(description = "将staffId的所有工作项转移至targetStaffId")
+    @SneakyThrows
+    @PutMapping("/{staffId}/transfer/{targetStaffId}")
+    public ResponseMap transferTasksToSingleStaff(
+            @RequestHeader(TokenUtils.HEADER_TOKEN) String token,
+            @PathVariable Integer projectId,
+            @PathVariable Integer staffId,
+            @PathVariable Integer targetStaffId
+    ) {
+        if (taskService.transferTasksToSingleStaff(token, projectId, staffId, targetStaffId)) {
+            return ResponseMap.ofSuccess();
+        }
+        throw new BadRequestException(BadRequestException.OPERATE_FAILED);
+    }
 }

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/Task.java

@@ -133,6 +133,8 @@ public class Task {
             return false;
         if (!Objects.equals(rawTask.getTaskCreatedTime(), this.getTaskCreatedTime()))
             return false;
+        if (!Objects.equals(rawTask.getChildrenCount(), this.getChildrenCount()))
+            return false;
         return Objects.equals(rawTask.getTaskClosedTime(), this.getTaskClosedTime());
     }
 }

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/ITaskService.java

@@ -33,6 +33,7 @@ public interface ITaskService extends IService<Task> {
 
     /**
      * 对拥有项目一级/二级访问权限的员工，直接返回1
+     *
      * @return 1:all rights 2:father holder 3:current holder 0:no right
      */
     Integer getHolderLevel(String token, Long taskId);
@@ -49,4 +50,5 @@ public interface ITaskService extends IService<Task> {
 
     Boolean transferStaffTasks(String token, Integer projectId, Integer transferredStaffId, Map<Long, Integer> transferMap) throws ForbiddenException, BadRequestException;
 
+    Boolean transferTasksToSingleStaff(String token, Integer projectId, Integer transferredStaffId, Integer targetStaffId) throws ForbiddenException, BadRequestException;
 }

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/ProjectGroupServiceImpl.java

@@ -96,11 +96,11 @@ public class ProjectGroupServiceImpl extends ServiceImpl<ProjectGroupMapper, Pro
         }
 
         return baseMapper.update(
-                ProjectGroup.builder()
+                null,
-                        .projectId(projectId)
+                Wrappers.<ProjectGroup>lambdaUpdate()
-                        .staffId(targetId)
+                        .eq(ProjectGroup::getProjectId, projectId)
-                        .build(),
+                        .eq(ProjectGroup::getStaffId, targetId)
-                Wrappers.<ProjectGroup>lambdaUpdate().set(ProjectGroup::getProjectStaffPosition, positions)
+                        .set(ProjectGroup::getProjectStaffPosition, positions)
         ) == 1;
     }
 

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/TaskServiceImpl.java

@@ -81,6 +81,7 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
                                 .in(Task::getTaskFatherId, res));
                 baseMapper.update(null, Wrappers.<Task>lambdaUpdate().in(Task::getTaskId, res).set(Task::getChildrenCount, 0));
                 baseMapper.delete(Wrappers.<Task>lambdaQuery().in(Task::getTaskId, res));
+
                 if (list == null || list.isEmpty()) break;
                 res = list.stream().map(Task::getTaskId).collect(Collectors.toList());
             }
@@ -283,10 +284,12 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
             }
             task.setTaskCreatedTime(null);
             task.setTaskStatus(Task.STATUS_WAITING);
+            task.setChildrenCount(0);
             task.setTaskClosedTime(null);
             if (baseMapper.insert(task) == 0) {
                 throw new BadRequestException(BadRequestException.OPERATE_FAILED);
             }
+            baseMapper.update(null, Wrappers.<Task>lambdaUpdate().setSql("children_count = children_count + 1"));
         } catch (Exception e) {
             log.error(e.getMessage(), e);
             throw new BadRequestException(BadRequestException.OPERATE_FAILED);
@@ -429,7 +432,7 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
         return taskTrendDTO;
     }
 
-    //不需要定义为事务，因为updateBatch已经定义为事务
+    @Transactional(isolation = Isolation.SERIALIZABLE, rollbackFor = Exception.class)
     @Override
     public Boolean transferStaffTasks(String token, Integer projectId, Integer transferredStaffId, Map<Long, Integer> transferMap) throws ForbiddenException, BadRequestException {
         if (projectGroupService.getProjectAccessLevel(token, projectId) == 0
@@ -482,4 +485,26 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
         );
     }
 
+
+    @Transactional(isolation = Isolation.SERIALIZABLE, rollbackFor = Exception.class)
+    @Override
+    public Boolean transferTasksToSingleStaff(String token, Integer projectId, Integer transferredStaffId, Integer targetStaffId) throws ForbiddenException, BadRequestException {
+        if (projectGroupService.getProjectAccessLevel(token, projectId) == 0
+                || projectGroupService.getProjectAccessLevelIgnoreGlobalLevel(transferredStaffId, projectId) == 0
+                || projectGroupService.getProjectAccessLevelIgnoreGlobalLevel(targetStaffId, projectId) == 0) {
+            throw new ForbiddenException(IProjectGroupService.UNABLE_TO_ACCESS_PROJECT);
+        }
+        if (projectGroupService.compareProjectAccessLevel(projectId, token, transferredStaffId) < 0) {
+            throw new ForbiddenException(ForbiddenException.UNABLE_TO_OPERATE);
+        }
+        Long transferredTaskCount = baseMapper.selectCount(Wrappers.<Task>lambdaQuery().eq(Task::getTaskHolderId, transferredStaffId));
+        int updatedTaskCount = baseMapper.update(
+                null,
+                Wrappers.<Task>lambdaUpdate()
+                        .eq(Task::getTaskHolderId, transferredStaffId)
+                        .set(Task::getTaskHolderId, targetStaffId)
+        );
+        return transferredTaskCount.intValue() == updatedTaskCount;
+    }
+
 }