PostRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class PostRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            "title" => "unique:posts|min:2|max:120|string",
            "description" => "nullable|string|max:500",
            "tags.*" => "string|max:30", // cada tag debe ser un string y no puede tener una longitud mayor de 30
        ];
    }
}