update

examcloud-api-commons/src/main/java/cn/com/qmth/examcloud/api/commons/security/bean/UserDataRule.java

@@ -3,7 +3,9 @@ package cn.com.qmth.examcloud.api.commons.security.bean;
 import cn.com.qmth.examcloud.api.commons.exchange.JsonSerializable;
 
 import java.util.HashSet;
+import java.util.Optional;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 public class UserDataRule implements JsonSerializable {
 
@@ -61,14 +63,14 @@ public class UserDataRule implements JsonSerializable {
     }
 
     /**
-     * 返回String类型的值集合（特殊情况下使用）
+     * 返回String值类型的“refIds”集合
      */
     public Set<String> stringRefIds() {
-        Set<String> stringRefIds = new HashSet<>();
-        for (Long id : getRefIds()) {
-            stringRefIds.add(String.valueOf(id));
-        }
-        return stringRefIds;
+        return Optional.ofNullable(refIds)
+                .orElse(new HashSet<>())
+                .stream()
+                .map(e -> String.valueOf(e))
+                .collect(Collectors.toSet());
     }
 
     @Override