zwZjut commented on a change in pull request #6966:
URL: https://github.com/apache/dolphinscheduler/pull/6966#discussion_r755670031



##########
File path: 
dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ProcessTaskRelationServiceImpl.java
##########
@@ -114,29 +116,70 @@
     /**
      * delete task upstream relation
      *
-     * @param loginUser login user
-     * @param projectCode project code
+     * @param loginUser    login user
+     * @param projectCode  project code
      * @param preTaskCodes the pre task codes, sep ','
-     * @param taskCode the post task code
+     * @param taskCode     the post task code
      * @return delete result code
      */
     @Override
     public Map<String, Object> deleteUpstreamRelation(User loginUser, long 
projectCode, String preTaskCodes, long taskCode) {
-        return null;
+        Project project = projectMapper.queryByCode(projectCode);
+        //check user access for project
+        Map<String, Object> result = 
projectService.checkProjectAndAuth(loginUser, project, projectCode);
+        if (result.get(Constants.STATUS) != Status.SUCCESS) {
+            return result;
+        }
+        if (org.apache.commons.lang.StringUtils.isEmpty(preTaskCodes)) {

Review comment:
        @RequestParam(name = "postTaskCodes", required = true) String 
postTaskCodes,  empty string is allowed




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