set projection in findByKanbanCode

kanban-console/src/main/java/com/uas/kanban/dao/KanbanHistoryDao.java

@@ -27,7 +27,13 @@ public class KanbanHistoryDao extends BaseDao<KanbanHistory> {
     public List<KanbanHistory> findByKanbanCode(@NotEmpty("kanbanCode") String kanbanCode) {
         Query<KanbanHistory> query = createQuery();
         query.filter("kanbanCode", kanbanCode);
+        // 只取非自动保存的记录
         query.filter("autoSaved", false);
+        // 只返回特定字段
+        query.project("code", true);
+        query.project("description", true);
+        query.project("createTime", true);
+        // 只取前 20 条记录
         FindOptions findOptions = new FindOptions();
         findOptions.limit(20);
         return query.asList(findOptions);