diff --git a/src/main/java/com/sqx/modules/course/entity/Course.java b/src/main/java/com/sqx/modules/course/entity/Course.java
index a4415160..63367619 100644
--- a/src/main/java/com/sqx/modules/course/entity/Course.java
+++ b/src/main/java/com/sqx/modules/course/entity/Course.java
@@ -329,6 +329,7 @@ public class Course implements Serializable {
     private String courseDetailsName;
 
     @TableField(exist = false)
+    @JsonSerialize(using = ToStringSerializer.class)
     private Long courseDetailsId;
 
     @TableField(exist = false)