验证规则写在哪里比较好？

<?php

namespace App\Http\Requests;

use App\Http\Requests\Request;

class UserRequest extends Request
{
    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'id'       => 'required_with:id|exists:users',
            'name' => 'required|max:255|unique:users,name,'.$this->get('id'),
            'email'    => 'required|email|max:255|unique:users,email,'.$this->get('id'),
            'password' => 'required_without:id|confirmed|min:6',
        ];
    }
}Copy

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\UserRequest  $request
     * @return \Illuminate\Http\Response
     */
    public function store(UserRequest $request)
    {
        # code...
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\UserRequest  $request
     * @param  \App\Models\User  $user
     * @return \Illuminate\Http\Response
     */
    public function update(UserRequest $request, User $user)
    {
        # code...
    }Copy