How to validate a field based on another model data - mysql

Question

I'm trying to validate a date field based on information stored in the database through another model.
When I test the api, validation works correctly throwing the exception, however, the insertion occurs before this exception. That is, it does not prevent the insertion in thedatabase. Where I went wrong?
This is my validate function:
module.exports = (sequelize, DataTypes) => {
const Step = sequelize.define('Step', {
...
resultDate: {
type: DataTypes.DATE,
validate: {
isEven(value){
sequelize.models.Call
.findById(this.call_id)
.then(call => {
if(value >= call.endingDate) throw new Error('Error message here!');
});
...
And this is the result:
Executing (default): SELECT [...] `Call`.`id` = '19c7e81e-5c23-4fd5-8623-0170deee6cd4');
Executing (default): INSERT INTO `Steps` [...];
Unhandled rejection Error message here!
Clearly, the initial SELECT is to perform validation, however, before the validation quit and throw the exception, the API inserts into the database and returns success already!
How do I ask the model to wait for all validations before inserting?

Answer 1

By changing custom validator arity (the second argument is a callback) you can change it to an asynchronous handler. So your code should look like this:
module.exports = (sequelize, DataTypes) => {
const Step = sequelize.define('Step', {
...
resultDate: {
type: DataTypes.DATE,
validate: {
isEven(value, next){
sequelize.models.Call
.findById(this.call_id)
.then(call => {
next(value >= call.endingDate ? 'Error message here!' : null)
})
.catch(next);
...