Rajesh - Validate description is string

server.js

// ...

// POST /todos

app.post('/todos', middleware.requireAuthentication, function(req, res) {
  var body = _.pick(req.body, 'description', 'completed');

	db.todo.create(body).then(function (todo) {
		todo.setUser(req.user).then(function () {
			res.json(todo);
		});
	}).catch(function (e) {
		res.status(400).json(e);
	});
});


// ...

todos.js

var _ = require('underscore');

module.exports = function(sequelize, DataTypes) {
   return sequelize.define('todo', {
      description: {
         type: DataTypes.STRING,
         allowNull: false,
         validate: {
            len: [1, 250]
         }
      },
      completed: {
         type: DataTypes.BOOLEAN,
         allowNull: false,
         defaultValue: false
      }
   }, {
      validate: {
         descriptionIsString: function() {
            if (!_.isString(this.description)) {
               throw new Error('Description must be string.')
            }
         }
      }
   });
};