update

controllers/subjectController.js

@@ -349,6 +349,108 @@ class SubjectController {
       next(error);
     }
   }
+
+  /**
+   * Add chapter to subject (Create chapter within subject context)
+   */
+  async addChapterToSubject(req, res, next) {
+    try {
+      const { subjectId } = req.params;
+      const chapterData = req.body;
+
+      // Check if subject exists
+      const subject = await Subject.findByPk(subjectId);
+      if (!subject) {
+        return res.status(404).json({
+          success: false,
+          message: 'Subject not found',
+        });
+      }
+
+      // Validate required fields
+      if (!chapterData.chapter_number || !chapterData.chapter_title) {
+        return res.status(400).json({
+          success: false,
+          message: 'chapter_number and chapter_title are required',
+        });
+      }
+
+      // Create chapter with subject_id
+      const chapter = await Chapter.create({
+        ...chapterData,
+        subject_id: subjectId,
+      });
+
+      // Clear cache
+      await cacheUtils.deletePattern('chapters:*');
+      await cacheUtils.deletePattern(`subject:${subjectId}:chapters:*`);
+
+      res.status(201).json({
+        success: true,
+        message: 'Chapter added to subject successfully',
+        data: chapter,
+      });
+    } catch (error) {
+      next(error);
+    }
+  }
+
+  /**
+   * Remove chapter from subject (Delete chapter within subject context)
+   */
+  async removeChapterFromSubject(req, res, next) {
+    try {
+      const { subjectId, chapterId } = req.params;
+
+      // Check if subject exists
+      const subject = await Subject.findByPk(subjectId);
+      if (!subject) {
+        return res.status(404).json({
+          success: false,
+          message: 'Subject not found',
+        });
+      }
+
+      // Find chapter
+      const chapter = await Chapter.findOne({
+        where: { 
+          id: chapterId,
+          subject_id: subjectId,
+        },
+      });
+
+      if (!chapter) {
+        return res.status(404).json({
+          success: false,
+          message: 'Chapter not found in this subject',
+        });
+      }
+
+      // Check if chapter has lessons
+      const Lesson = require('../models').Lesson;
+      const lessonsCount = await Lesson.count({ where: { chapter_id: chapterId } });
+      if (lessonsCount > 0) {
+        return res.status(400).json({
+          success: false,
+          message: `Cannot delete chapter. It has ${lessonsCount} lesson(s). Delete lessons first.`,
+        });
+      }
+
+      await chapter.destroy();
+
+      // Clear cache
+      await cacheUtils.deletePattern('chapters:*');
+      await cacheUtils.deletePattern(`chapter:${chapterId}*`);
+      await cacheUtils.deletePattern(`subject:${subjectId}:chapters:*`);
+
+      res.json({
+        success: true,
+        message: 'Chapter removed from subject successfully',
+      });
+    } catch (error) {
+      next(error);
+    }
+  }
 }
 
 module.exports = new SubjectController();