import { schema, rules } from '@ioc:Adonis/Core/Validator'; import { HttpContextContract } from '@ioc:Adonis/Core/HttpContext'; export default class UpdateCourseValidator { constructor(protected ctx: HttpContextContract) {} public schema = schema.create({ title: schema.string.optional(), description: schema.string.optional(), category_id: schema.string.optional({}, [rules.exists({ table: 'categories', column: 'id' })]), }); public messages = {}; }