Enhance logging and conditional rendering in VocabService and VocabLessonView

- Added detailed logging in VocabService for lesson retrieval, including lesson ID, title, and exercise count.
- Improved conditional rendering in VocabLessonView to handle cases where grammar exercises may not be present, enhancing user experience.
- Updated logging in VocabLessonView to provide insights into loaded lessons and exercises, aiding in debugging and monitoring.

backend/services/vocabService.js

@@ -883,7 +883,14 @@ export default class VocabService {
       throw err;
     }
 
-    return lesson.get({ plain: true });
+    const plainLesson = lesson.get({ plain: true });
+    console.log(`[getLesson] Lektion ${lessonId} geladen:`, {
+      id: plainLesson.id,
+      title: plainLesson.title,
+      exerciseCount: plainLesson.grammarExercises ? plainLesson.grammarExercises.length : 0,
+      exercises: plainLesson.grammarExercises
+    });
+    return plainLesson;
   }
 
   async addLessonToCourse(hashedUserId, courseId, { chapterId, lessonNumber, title, description, weekNumber, dayNumber, lessonType, audioUrl, culturalNotes, targetMinutes, targetScorePercent, requiresReview }) {

check-lesson-exercises.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+# Script zum Prüfen, ob Übungen für eine Lektion vorhanden sind
+# Verwendung: ./check-lesson-exercises.sh [lesson_id]
+
+LESSON_ID="${1:-1}"
+
+echo "🔍 Prüfe Übungen für Lektion ID: $LESSON_ID"
+echo ""
+
+psql -U yourpart -d yp3 << EOF
+-- Prüfe Lektion
+SELECT 
+    l.id,
+    l.title,
+    l.course_id,
+    COUNT(e.id) as exercise_count
+FROM community.vocab_course_lesson l
+LEFT JOIN community.vocab_grammar_exercise e ON e.lesson_id = l.id
+WHERE l.id = $LESSON_ID
+GROUP BY l.id, l.title, l.course_id;
+
+-- Zeige alle Übungen für diese Lektion
+SELECT 
+    e.id,
+    e.exercise_number,
+    e.title,
+    e.exercise_type_id,
+    et.name as exercise_type_name
+FROM community.vocab_grammar_exercise e
+LEFT JOIN community.vocab_grammar_exercise_type et ON et.id = e.exercise_type_id
+WHERE e.lesson_id = $LESSON_ID
+ORDER BY e.exercise_number;
+EOF

check-vocab-schema.sql

@@ -0,0 +1,38 @@
+-- ============================================
+-- Prüfe ob alle notwendigen Spalten vorhanden sind
+-- ============================================
+-- Führe diese Queries auf dem Server aus, um zu prüfen, ob alles vorhanden ist
+
+-- Prüfe native_language_id in vocab_course
+SELECT 
+    column_name, 
+    data_type, 
+    is_nullable
+FROM information_schema.columns 
+WHERE table_schema = 'community' 
+  AND table_name = 'vocab_course' 
+  AND column_name = 'native_language_id';
+
+-- Prüfe cultural_notes in vocab_course_lesson
+SELECT 
+    column_name, 
+    data_type, 
+    is_nullable
+FROM information_schema.columns 
+WHERE table_schema = 'community' 
+  AND table_name = 'vocab_course_lesson' 
+  AND column_name = 'cultural_notes';
+
+-- Prüfe ob vocab_grammar_exercise Tabelle existiert
+SELECT EXISTS (
+    SELECT FROM information_schema.tables 
+    WHERE table_schema = 'community' 
+    AND table_name = 'vocab_grammar_exercise'
+);
+
+-- Prüfe ob vocab_grammar_exercise_type Tabelle existiert
+SELECT EXISTS (
+    SELECT FROM information_schema.tables 
+    WHERE table_schema = 'community' 
+    AND table_name = 'vocab_grammar_exercise_type'
+);

debug-lesson-exercises.js

@@ -0,0 +1,78 @@
+#!/usr/bin/env node
+/**
+ * Debug-Script zum Prüfen, ob Übungen für eine Lektion vorhanden sind
+ * Verwendung: node debug-lesson-exercises.js [lessonId]
+ */
+
+import { sequelize } from './backend/utils/sequelize.js';
+import VocabCourseLesson from './backend/models/community/vocab_course_lesson.js';
+import VocabGrammarExercise from './backend/models/community/vocab_grammar_exercise.js';
+
+const lessonId = process.argv[2] ? parseInt(process.argv[2]) : 1;
+
+async function debugLesson() {
+  try {
+    await sequelize.authenticate();
+    console.log('✅ Datenbankverbindung erfolgreich\n');
+
+    // Lade Lektion mit Übungen (wie im Backend)
+    const lesson = await VocabCourseLesson.findByPk(lessonId, {
+      include: [
+        {
+          model: require('./backend/models/community/vocab_course.js').default,
+          as: 'course'
+        },
+        {
+          model: VocabGrammarExercise,
+          as: 'grammarExercises',
+          include: [
+            {
+              model: require('./backend/models/community/vocab_grammar_exercise_type.js').default,
+              as: 'exerciseType'
+            }
+          ],
+          required: false,
+          separate: true,
+          order: [['exerciseNumber', 'ASC']]
+        }
+      ]
+    });
+
+    if (!lesson) {
+      console.log(`❌ Lektion ${lessonId} nicht gefunden`);
+      return;
+    }
+
+    console.log(`📚 Lektion: ${lesson.title} (ID: ${lesson.id})`);
+    console.log(`   Kurs: ${lesson.course?.title || 'N/A'}`);
+    console.log(`   Übungen (via Include): ${lesson.grammarExercises ? lesson.grammarExercises.length : 0}\n`);
+
+    // Prüfe direkt in der Datenbank
+    const directExercises = await VocabGrammarExercise.findAll({
+      where: { lessonId: lesson.id },
+      order: [['exerciseNumber', 'ASC']]
+    });
+
+    console.log(`📊 Direkte Abfrage: ${directExercises.length} Übung(en) gefunden`);
+    directExercises.forEach((ex, idx) => {
+      console.log(`   ${idx + 1}. ${ex.title} (ID: ${ex.id}, Typ: ${ex.exerciseTypeId})`);
+    });
+
+    // Plain object
+    const plain = lesson.get({ plain: true });
+    console.log(`\n📦 Plain Object:`);
+    console.log(`   grammarExercises: ${plain.grammarExercises ? plain.grammarExercises.length : 'undefined'}`);
+    if (plain.grammarExercises && plain.grammarExercises.length > 0) {
+      plain.grammarExercises.forEach((ex, idx) => {
+        console.log(`   ${idx + 1}. ${ex.title} (ID: ${ex.id})`);
+      });
+    }
+
+  } catch (error) {
+    console.error('❌ Fehler:', error);
+  } finally {
+    await sequelize.close();
+  }
+}
+
+debugLesson();

frontend/src/views/social/VocabLessonView.vue

@@ -64,9 +64,10 @@
       </div>
 
       <!-- Übungen-Tab -->
-      <div v-if="activeTab === 'exercises' && lesson.grammarExercises && lesson.grammarExercises.length > 0" class="grammar-exercises">
-        <h3>{{ $t('socialnetwork.vocab.courses.grammarExercises') }}</h3>
-        <div v-for="exercise in lesson.grammarExercises" :key="exercise.id" class="exercise-item">
+      <div v-if="activeTab === 'exercises'" class="grammar-exercises">
+        <div v-if="lesson.grammarExercises && lesson.grammarExercises.length > 0">
+          <h3>{{ $t('socialnetwork.vocab.courses.grammarExercises') }}</h3>
+          <div v-for="exercise in lesson.grammarExercises" :key="exercise.id" class="exercise-item">
           <h4>{{ exercise.title }}</h4>
           <p v-if="exercise.instruction" class="exercise-instruction">{{ exercise.instruction }}</p>
           
@@ -155,10 +156,9 @@
             <pre>{{ JSON.stringify(exercise, null, 2) }}</pre>
           </div>
         </div>
-      </div>
-      
-      <div v-else>
-        <p>{{ $t('socialnetwork.vocab.courses.noExercises') }}</p>
+        <div v-else>
+          <p>{{ $t('socialnetwork.vocab.courses.noExercises') }}</p>
+        </div>
       </div>
     </div>
   </div>
@@ -264,13 +264,17 @@ export default {
       try {
         const res = await apiClient.get(`/api/vocab/lessons/${this.lessonId}`);
         this.lesson = res.data;
+        console.log('[VocabLessonView] Geladene Lektion:', this.lesson);
+        console.log('[VocabLessonView] Übungen:', this.lesson?.grammarExercises);
         // Initialisiere Übungen aus der Lektion oder lade sie separat
         if (this.lesson && this.lesson.id) {
           if (this.lesson.grammarExercises && this.lesson.grammarExercises.length > 0) {
             // Übungen sind bereits in der Lektion enthalten
+            console.log('[VocabLessonView] Übungen bereits in Lektion enthalten:', this.lesson.grammarExercises.length);
             this.initializeExercises(this.lesson.grammarExercises);
           } else {
             // Lade Übungen separat (Fallback)
+            console.log('[VocabLessonView] Lade Übungen separat...');
             await this.loadGrammarExercises();
           }
         }