管乐迷课件

mec-biz/src/main/java/com/ym/mec/biz/service/impl/LessonCoursewareServiceImpl.java

@@ -61,8 +61,9 @@ public class LessonCoursewareServiceImpl extends ServiceImpl<LessonCoursewareMap
                     e.setCourseNum(entity.getCourseNum());
                 }
             }
-            String subjectIds = dtos.stream().map(e -> e.getSubjectId().toString()).collect(Collectors.joining(","));
-            if(StringUtils.isNotEmpty(subjectIds)){
+            List<Integer> collect = dtos.stream().map(e -> e.getSubjectId()).collect(Collectors.toList());
+            if(CollectionUtils.isNotEmpty(collect)){
+                String subjectIds = collect.stream().map(e -> String.valueOf(e)).collect(Collectors.joining(","));
                 List<Map<Integer, String>> subjectNames = subjectDao.queryNameByIds(subjectIds);
                 Map<Integer, String> subjectNameMap = MapUtil.convertMybatisMap(subjectNames);
                 for (LessonCoursewareWrapper.LessonCoursewareDto e : dtos) {