department name issue fixed on login

lib/models/user.dart

@@ -159,9 +159,9 @@ class User {
       });
     }
     if (json['department_name'] != null) {
-      departmentId = [];
+      departmentName = [];
       json['department_name'].forEach((v) {
-        departmentId.add(v);
+        departmentName.add(v);
       });
     }
     message = json['message'];