Fix some questionset code

backend/.gitattributes

@@ -0,0 +1 @@
+*.sh text eol=lf

backend/controllers/tagController.js

@@ -0,0 +1,33 @@
+const Tag = require('../models/tags');
+
+exports.getAllTags = async (req, res) => {
+  try {
+    const tags = await Tag.findAll();
+    res.json(tags);
+  } catch (err) {
+    console.error('Error fetching tags:', err);
+    res.status(500).json({ error: 'Failed to fetch tags' });
+  }
+};
+
+exports.createTag = async (req, res) => {
+  const { name } = req.body;
+
+  // Basic validation
+  if (!name) {
+    return res.status(400).json({ error: 'Tag name is required' });
+  }
+
+  try {
+    const existing = await Tag.findByName(name);
+    if (existing) {
+      return res.status(409).json({ error: 'Tag already exists' });
+    }
+
+    const tag = await Tag.create(name);
+    res.status(201).json(tag);
+  } catch (err) {
+    console.error('Error creating tag:', err);
+    res.status(500).json({ error: 'Failed to create tag' });
+  }
+};

backend/db/folders.sql

@@ -0,0 +1,12 @@
+-- 開啟 UUID extension（若尚未啟用）
+CREATE EXTENSION IF NOT EXISTS "pgcrypto";
+
+-- Create folders table
+CREATE TABLE IF NOT EXISTS folders (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    title VARCHAR(255) NOT NULL,
+    tag_id UUID NOT NULL,
+    user_id UUID NOT NULL REFERENCES users(id),
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);

backend/db/questions.sql

@@ -1,12 +1,4 @@
--- Create folders table
-CREATE TABLE IF NOT EXISTS folders (
-    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
-    title VARCHAR(255) NOT NULL,
-    tag_id UUID NOT NULL,
-    user_id UUID NOT NULL REFERENCES users(id),
-    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
-);
+
 
 -- Create questions table
 CREATE TABLE IF NOT EXISTS questions (
@@ -22,11 +14,3 @@ CREATE TABLE IF NOT EXISTS questions (
     updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
 );
 
--- Create tags table
-CREATE TABLE IF NOT EXISTS tags (
-    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
-    name VARCHAR(255) NOT NULL,
-    user_id UUID NOT NULL REFERENCES users(id),
-    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
-); 

backend/db/tags.sql

@@ -0,0 +1,11 @@
+-- 開啟 UUID extension（若尚未啟用）
+CREATE EXTENSION IF NOT EXISTS "pgcrypto";
+
+-- Create tags table
+CREATE TABLE IF NOT EXISTS tags (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name VARCHAR(255) NOT NULL,
+    user_id UUID NOT NULL REFERENCES users(id),
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+); 

backend/db/tokens.sql

@@ -0,0 +1,14 @@
+-- 開啟 UUID extension（若尚未啟用）
+CREATE EXTENSION IF NOT EXISTS "pgcrypto";
+
+-- 建立 tokens 表格
+CREATE TABLE IF NOT EXISTS tokens (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id UUID NOT NULL,
+  value TEXT NOT NULL UNIQUE,
+  expired_at TIMESTAMP NOT NULL,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+
+  -- 外鍵關聯
+  CONSTRAINT fk_token_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);

backend/index.js

@@ -66,6 +66,9 @@ app.use((err, req, res, next) => {
   });
 });
 
+const tagRoutes = require('./routes/tagRoutes');
+app.use('/tags', tagRoutes);
+
 const PORT = process.env.PORT || 3000;
 
 app.listen(PORT, '0.0.0.0', (err) => {
@@ -82,4 +85,6 @@ app.listen(PORT, '0.0.0.0', (err) => {
   console.log('- GET /auth/me');
   console.log('- GET /api/test');
   console.log('- POST /api/question-set');
+  // console.log('- POST /tags');
+  console.log('- GET /tags');
 });

backend/models/questions.js

@@ -11,6 +11,15 @@ class QuestionSet {
     return result.rows[0];
   }
 
+  static async findTagByName(name, userId) {
+    const query = `
+      SELECT * FROM tags
+      WHERE name = $1 AND user_id = $2
+    `;
+    const result = await db.query(query, [name, userId]);
+    return result.rows[0] || null;
+  }
+
   static async createTag(name, userId) {
     const query = `
       INSERT INTO tags (name, user_id)
@@ -43,8 +52,12 @@ class QuestionSet {
     try {
       await client.query('BEGIN');
 
-      // Create tag
-      const tag = await this.createTag(tagName, userId);
+      // Check if tag already exists
+      const tag = await this.findTagByName(tagName, userId);
+      if (!tag) {
+        // Create tag if not exists
+        tag = await this.createTag(tagName, userId);
+      }
 
       // Create folder
       const folder = await this.createFolder(folderName, tag.id, userId);

backend/models/tags.js

@@ -0,0 +1,23 @@
+const pool = require('../db/db');
+
+const Tag = {
+  async create(name) {
+    const result = await pool.query(
+      'INSERT INTO tags (name) VALUES ($1) RETURNING *',
+      [name]
+    );
+    return result.rows[0];
+  },
+
+  async findAll() {
+    const result = await pool.query('SELECT * FROM tags ORDER BY created_at DESC');
+    return result.rows;
+  },
+
+  async findByName(name) {
+    const result = await pool.query('SELECT * FROM tags WHERE name = $1', [name]);
+    return result.rows[0];
+  }
+};
+
+module.exports = Tag;