バリデーション laravel5.5

バリデーションはコントローラに書かずに、フォームリクエストに書く。
（コントローラとルートの間？）
今回は計４つ
ターミナルで
> php artisan make:request Item\StoreRequest

できあがったStoreRequestを下記のように修正

Item/StoreRequest.php

<?php

namespace App\Http\Requests\Item;

use Illuminate\Foundation\Http\FormRequest;

class StoreRequest 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 [
            'category_id' => ['required', 'numeric', 'exists:categories,id'], //numeric = 数値
            'name' => ['required', 'string', 'max:100', 'unique:items'],  //同じ名前のカテゴリーがあった場合は作成出来ないようにする。
        ];
    }
}

コントローラのstoreメソッドを書き換える

ItemController.php

use App\Http\Requests\Item\Request;
// ↓このように
use App\Http\Requests\Item\StoreRequest;

public function store(Request $request)
// ↓このように
public function store(StoreRequest $request)

items/create.blade.php

@if ($errors->any())
        <div class="alert alert-danger">
            <ul>
                @foreach ($errors->all() as $error)
                    <li>{{ $error }}</li>
                @endforeach
            </ul>
        </div>
    @endif

後の３箇所も同様に。
viewとcontrollerは省略

> php artisan make:request Category\StoreRequest

/StoreRequest.php

<?php

namespace App\Http\Requests\Category;

use Illuminate\Foundation\Http\FormRequest;

class StoreRequest 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 [
            'name' => ['required', 'string', 'max:20', 'unique:categories'],
        ];
    }
}

> php artisan make:request Item\StoreRequest

Item/UpdateRequest.php

<?php

namespace App\Http\Requests\Item;

use App\Item;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

class UpdateRequest 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()
    {
        $item = $this->route()->parameter('item');
        assert($item instanceof Item);

        return [
            'category_id' => ['required', 'numeric', 'exists:categories,id'],
            'name' => ['required', 'string', 'max:100', Rule::unique('items')->ignore($item->id)],
        ];
    }
}

> php artisan make:request Category\UpdateRequest

Category/UpdateRequest.php

<?php

namespace App\Http\Requests\Category;

use App\Category;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

class UpdateRequest 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()
    {
        $category = $this->route()->parameter('category');
        assert($category instanceof Category);

        return [
            'name' => ['required', 'string', 'max:20', Rule::unique('categories')->ignore($category->id)],
        ];
    }
}

完成！

Laravelの公式サイト：その他バリデーションについて
https://readouble.com/laravel/5.5/ja/validation.html