fix(clickTtPlayerRegistrationService): improve error messaging for missing association member number

- Updated the club retrieval logic to include specific attributes, enhancing data accuracy.
- Enhanced error handling to provide detailed feedback when the association member number is missing, including the club name for better context.

backend/services/clickTtPlayerRegistrationService.js

@@ -47,10 +47,21 @@ class ClickTtPlayerRegistrationService {
       throw new HttpError('Mitglied nicht gefunden', 404);
     }
 
-    const club = await Club.findByPk(clubId);
-    const associationMemberNumber = String(club?.associationMemberNumber || '').trim();
+    const club = await Club.findByPk(clubId, {
+      attributes: ['id', 'name', 'associationMemberNumber'],
+    });
+    const associationMemberNumber = String(
+      club?.associationMemberNumber ??
+      club?.association_member_number ??
+      club?.dataValues?.associationMemberNumber ??
+      club?.dataValues?.association_member_number ??
+      ''
+    ).trim();
     if (!associationMemberNumber) {
-      throw new HttpError('Für den Verein ist keine Verbands-Mitgliedsnummer hinterlegt', 400);
+      throw new HttpError(
+        `Für den Verein "${club?.name ?? clubId}" ist keine Verbands-Mitgliedsnummer hinterlegt. Bitte in den Vereinseinstellungen unter "Verbands-Mitgliedsnummer" eintragen.`,
+        400
+      );
     }
 
     const account = await ClickTtAccount.findOne({ where: { userId } });