diff --git a/Core/Objects/DatabaseEntity/Attribute/MultipleReference.class.php b/Core/Objects/DatabaseEntity/Attribute/MultipleReference.class.php
index 9fc21f2..ffa2ac5 100644
--- a/Core/Objects/DatabaseEntity/Attribute/MultipleReference.class.php
+++ b/Core/Objects/DatabaseEntity/Attribute/MultipleReference.class.php
@@ -12,7 +12,7 @@ class MultipleReference {
   private string $thisProperty;
   private string $relProperty;
 
-  public function __construct(string $className, string $thisProperty, string $relProperty) {
+  public function __construct(string $className, string $thisProperty, string $relProperty = "id") {
     $this->className = $className;
     $this->thisProperty = $thisProperty;
     $this->relProperty = $relProperty;
diff --git a/Core/Objects/DatabaseEntity/User.class.php b/Core/Objects/DatabaseEntity/User.class.php
index 068575f..e3c785c 100644
--- a/Core/Objects/DatabaseEntity/User.class.php
+++ b/Core/Objects/DatabaseEntity/User.class.php
@@ -137,4 +137,8 @@ class User extends DatabaseEntity {
       return false;
     }
   }
+
+  public function getDisplayName(): string {
+    return !empty($this->fullName) ? $this->fullName : $this->name;
+  }
 }
\ No newline at end of file