feat: comment to test run's case (#390)

backend/routes/comments/index.js

@@ -0,0 +1,46 @@
+import express from 'express';
+const router = express.Router();
+import { DataTypes } from 'sequelize';
+import defineComment from '../../models/comments.js';
+import defineUser from '../../models/users.js';
+import authMiddleware from '../../middleware/auth.js';
+import visibilityMiddleware from '../../middleware/verifyVisible.js';
+
+export default function (sequelize) {
+  const { verifySignedIn } = authMiddleware(sequelize);
+  const { verifyProjectVisibleFromCommentableId } = visibilityMiddleware(sequelize);
+  const Comment = defineComment(sequelize, DataTypes);
+  const User = defineUser(sequelize, DataTypes);
+  Comment.belongsTo(User, { foreignKey: 'userId', onDelete: 'CASCADE' });
+  User.hasMany(Comment, { foreignKey: 'userId', onDelete: 'CASCADE' });
+
+  router.get('/', verifySignedIn, verifyProjectVisibleFromCommentableId, async (req, res) => {
+    const { commentableType, commentableId } = req.query;
+
+    if (!commentableType || !commentableId) {
+      return res.status(400).json({ error: 'commentableType and commentableId are required' });
+    }
+
+    try {
+      const comments = await Comment.findAll({
+        where: {
+          commentableType: commentableType,
+          commentableId: commentableId,
+        },
+        include: [
+          {
+            model: User,
+            attributes: ['id', 'username', 'email'],
+          },
+        ],
+        order: [['createdAt', 'ASC']],
+      });
+      res.json(comments);
+    } catch (error) {
+      console.error(error);
+      res.status(500).send('Internal Server Error');
+    }
+  });
+
+  return router;
+}