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Laravel 【入門】 withErrorsの使い方

Last updated at Posted at 2021-10-31

はじめに

withErrorsで処理失敗時のエラーメッセージを出力する例をいくつか挙げています。
withErrorsはエラーが発生したら、セッションにエラーメッセージをフラッシュデータとして保存し、エラー表示をさせる事ができます。

目次

  1. 例外処理のエラーハンドリング
  2. CRUD処理失敗時
  3. バリデーション失敗時

例外処理のエラーハンドリング

public function store(Request $request)
    {
        DB::beginTransaction();
        try {
            // 何らかのDB登録処理
            DB::commit();
        } catch (\Exception $e) {
            DB::rollback();
            return redirect()->back()->withErrors('エラーが発生しました');
        }
        return view('index');
    }

CRUD処理失敗時

public function destroy(Post $post)
    {
        return $post->delete()
          ? redirect()->action([PostController::class, 'index'])->with('flash_message', '投稿の削除が成功しました。')
          : redirect()->action([PostController::class, 'index'])->withErrors('投稿の削除に失敗しました。');
    }

バリデーション失敗時

public function post(Request $request)
    {
        $validator = $this->post_validator($request->all());
        if ($validator->fails()) {
                         // バリデーション失敗時
            return redirect('index')
                ->withErrors($validator)
                ->withInput();
        } else {
            // バリデーション通過後の処理
        }
    }
protected function post_validator(array $data)
    {
        return Validator::make($data, [
            'content' => ['required']
        ]);
    }
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