Introduction

@skhail/validation provides a middleware for validating parameters for service methods.

Set it up

``js
import Joi from "joi";
import { ValidationMiddleware } from "@skhail/validation";

class MyService extends SkhailService {
static middlewares = [
new ValidationMiddleware({
create: [Joi.string().required(), Joi.boolean()],
}),
];

list() {
// ...
}
create(name: string, done: boolean = false) {
// ...
}
}
`

With this configuration, no validation is done when calling the list method. But validation is done on the create method

Alternatively you can provide a function to validate the params:

`js
import Joi from "joi";
import { ValidationMiddleware, ValidationError } from "@skhail/validation";

class MyService extends SkhailService {
static middlewares = [
new ValidationMiddleware({
create: (name: string, done?: boolean) => {
const errors: ValidationError[] = [];

if (name === "") {
errors.push(new ValidationError("Name is required", 0));
}

return errors;
},
}),
];

list() {
// ...
}
create(name: string, done: boolean = false) {
// ...
}
}
``

If the validation method return an empty array then the validation succeed. Else, it fails.