Cannot get Sequelize validation working - node.js

Question

I'm trying to implement validation in my Sequelize models. The model is defined as follows
var model = sequelize.define('Model', {
from: {
type: DataTypes.STRING,
allowNull: false,
validate: {
isEmail: true
}
}
}
Then I'm trying to build an instance and validate it:
var m = Model.build({ from: 'obviously not a email' });
var err = m.validate();
But if I do console.log(err), I get { fct: [Function] } only. Defining a custom validator that throws an exception results in an unhandled exception.
How should I use validate() properly?

Answer 1

Here is how to get your problem solved with Sequelize v2.0.0:
var Sequelize = require("sequelize")
, sequelize = new Sequelize("sequelize_test", "root")
var Model = sequelize.define('Model', {
from: {
type: Sequelize.STRING,
allowNull: false,
validate: {
isEmail: true
}
}
})
Model.sync().success(function() {
Model.build({ from: "foo#bar" }).validate().success(function(errors) {
console.log(errors)
})
})
This will result in:
{ from: [ 'Invalid email' ] }
Side note: You can also skip the validate-call and just create the instance instead:
Model.sync().success(function() {
Model
.create({ from: "foo#bar" })
.success(function() {
console.log('ok')
})
.error(function(errors) {
console.log(errors)
})
})
The error method will receive the very same error object as in the previous code snippet.
Greetings,
sdepold.

Answer 2

An alternative approach for validating in Sequelize, use a hook instead of a model validation. I'm using the 'beforeValidate' hook and adding custom validation (using validator module) with Promises that are rejected when validation fails.
var validator = require('validator');
module.exports = function(sequelize, DataTypes) {
var User = sequelize.define("User", {
email: {
type:DataTypes.STRING
},
password: {
type:DataTypes.STRING
}
});
//validate here
User.hook('beforeValidate', function(user, options) {
if(validator.isEmail(user.email)){
return sequelize.Promise.resolve(user);
}else{
return sequelize.Promise.reject('Validation Error: invalid email');
}
});
return User;
};

Answer 3

This worked for me
In model use :-
var model = sequelize.define('Model', {
from: {
type: DataTypes.STRING,
allowNull: false,
validate: {
isEmail: true
}
}
}
In your control logic while you save model do this :-
var Sequelize = require('sequelize');
var Model = require('your_model_folderpath').model;
Model.create({from: 'not email'}).then(function(model) {
// if validation passes you will get saved model
}).catch(Sequelize.ValidationError, function(err) {
// responds with validation errors
}).catch(function(err) {
// every other error
});