add changes

backend/models/index.js

@@ -0,0 +1,57 @@
+const fs = require('fs');
+const path = require('path');
+const Sequelize = require('sequelize');
+const basename = path.basename(__filename);
+const env = process.env.NODE_ENV || 'development';
+const config = require('../config/database')[env];
+const db = {};
+
+let sequelize;
+if (config.use_env_variable) {
+  sequelize = new Sequelize(process.env[config.use_env_variable], config);
+} else {
+  sequelize = new Sequelize(config.database, config.username, config.password, config);
+}
+
+// Import all model files
+fs
+  .readdirSync(__dirname)
+  .filter(file => {
+    return (
+      file.indexOf('.') !== 0 &&
+      file !== basename &&
+      file.slice(-3) === '.js' &&
+      file.indexOf('.test.js') === -1
+    );
+  })
+  .forEach(file => {
+    const model = require(path.join(__dirname, file))(sequelize, Sequelize.DataTypes);
+    db[model.name] = model;
+  });
+
+// Setup model associations
+Object.keys(db).forEach(modelName => {
+  if (db[modelName].associate) {
+    db[modelName].associate(db);
+  }
+});
+
+db.sequelize = sequelize;
+db.Sequelize = Sequelize;
+
+// Test database connection
+const testConnection = async () => {
+  try {
+    await sequelize.authenticate();
+    console.log('✅ Database connection established successfully.');
+    return true;
+  } catch (error) {
+    console.error('❌ Unable to connect to the database:', error.message);
+    return false;
+  }
+};
+
+// Export connection test function
+db.testConnection = testConnection;
+
+module.exports = db;