update

models/LessonStory.js

@@ -0,0 +1,56 @@
+const { DataTypes } = require('sequelize');
+const { sequelize } = require('../config/database');
+
+/**
+ * LessonStory Model - Pivot table for N-N relationship
+ * Many-to-Many: Lessons <-> Stories
+ */
+const LessonStory = sequelize.define('lesson_stories', {
+  id: {
+    type: DataTypes.UUID,
+    defaultValue: DataTypes.UUIDV4,
+    primaryKey: true,
+  },
+  lesson_id: {
+    type: DataTypes.UUID,
+    allowNull: false,
+    comment: 'ID của bài học',
+  },
+  story_id: {
+    type: DataTypes.UUID,
+    allowNull: false,
+    comment: 'ID của story',
+  },
+  display_order: {
+    type: DataTypes.INTEGER,
+    defaultValue: 0,
+    comment: 'Thứ tự hiển thị story trong lesson',
+  },
+  is_required: {
+    type: DataTypes.BOOLEAN,
+    defaultValue: true,
+    comment: 'Story này có bắt buộc hoàn thành không',
+  },
+  created_at: {
+    type: DataTypes.DATE,
+    allowNull: false,
+    defaultValue: DataTypes.NOW,
+  },
+  updated_at: {
+    type: DataTypes.DATE,
+    allowNull: false,
+    defaultValue: DataTypes.NOW,
+  },
+}, {
+  tableName: 'lesson_stories',
+  timestamps: true,
+  underscored: true,
+  indexes: [
+    { fields: ['lesson_id'] },
+    { fields: ['story_id'] },
+    { fields: ['lesson_id', 'story_id'], unique: true },
+    { fields: ['display_order'] },
+  ],
+});
+
+module.exports = LessonStory;

models/index.js

@@ -33,6 +33,7 @@ const Game = require('./Game');
 const GameType = require('./GameType');
 const LessonComponentProgress = require('./LessonComponentProgress');
 const LessonLeaderboard = require('./LessonLeaderboard');
+const LessonStory = require('./LessonStory');
 
 // Group 3.2: Vocabulary System (NEW)
 const Vocab = require('./Vocab');
@@ -162,6 +163,24 @@ const setupRelationships = () => {
   Chapter.hasMany(Lesson, { foreignKey: 'chapter_id', as: 'lessons' });
   Lesson.belongsTo(Chapter, { foreignKey: 'chapter_id', as: 'chapter' });
   
+  // Lesson <-> Story (N:N through LessonStory)
+  Lesson.belongsToMany(Story, {
+    through: LessonStory,
+    foreignKey: 'lesson_id',
+    otherKey: 'story_id',
+    as: 'stories'
+  });
+  Story.belongsToMany(Lesson, {
+    through: LessonStory,
+    foreignKey: 'story_id',
+    otherKey: 'lesson_id',
+    as: 'lessons'
+  });
+  
+  // Direct access to pivot table
+  LessonStory.belongsTo(Lesson, { foreignKey: 'lesson_id', as: 'lesson' });
+  LessonStory.belongsTo(Story, { foreignKey: 'story_id', as: 'story' });
+  
   // Lesson Progress relationships
   LessonComponentProgress.belongsTo(UsersAuth, { foreignKey: 'user_id', as: 'user' });
   LessonComponentProgress.belongsTo(Lesson, { foreignKey: 'lesson_id', as: 'lesson' });
@@ -295,6 +314,7 @@ module.exports = {
   GameType,
   LessonComponentProgress,
   LessonLeaderboard,
+  LessonStory,
   
   // Group 3.2: Vocabulary System (NEW)
   Vocab,