Laravel の paginate は一体何をやっているのか
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2018-06-27 開催の「第127回 PHP勉強会@東京」におけるLT資料です https://phpstudy.doorkeeper.jp/events/76011
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![23¥Illuminate¥Database¥Query¥Builder::paginate()public function paginate($perPage = 15, $columns = ['*'], $pageName = 'page', $page = null){$page = $page ?: Paginator::resolveCurrentPage($pageName);$total = $this->getCountForPagination($columns);$results = $total ? $this->forPage($page, $perPage)->get($columns) : collect();return $this->paginator($results, $total, $perPage, $page, ['path' => Paginator::resolveCurrentPath(),'pageName' => $pageName,]);}](/image.pl?url=https%3a%2f%2fimage.slidesharecdn.com%2flaravelpaginate-180626153902%2f85%2fLaravel-paginate-23-320.jpg&f=jpg&w=240)
![24¥Illuminate¥Database¥Query¥Builder::paginate()public function paginate($perPage = 15, $columns = ['*'], $pageName = 'page', $page = null){$page = $page ?: Paginator::resolveCurrentPage($pageName);$total = $this->getCountForPagination($columns);$results = $total ? $this->forPage($page, $perPage)->get($columns) : collect();return $this->paginator($results, $total, $perPage, $page, ['path' => Paginator::resolveCurrentPath(),'pageName' => $pageName,]);}currentPage を解決してそう](/image.pl?url=https%3a%2f%2fimage.slidesharecdn.com%2flaravelpaginate-180626153902%2f85%2fLaravel-paginate-24-320.jpg&f=jpg&w=240)
![29¥Illuminate¥Pagination¥PaginationServiceProviderpublic function register(){Paginator::viewFactoryResolver(function () {return $this->app['view'];});Paginator::currentPathResolver(function () {return $this->app['request']->url();});Paginator::currentPageResolver(function ($pageName = 'page') {$page = $this->app['request']->input($pageName);if (filter_var($page, FILTER_VALIDATE_INT) !== false && (int) $page >= 1) {return (int) $page;}return 1;});}](/image.pl?url=https%3a%2f%2fimage.slidesharecdn.com%2flaravelpaginate-180626153902%2f85%2fLaravel-paginate-29-320.jpg&f=jpg&w=240)
![30¥Illuminate¥Pagination¥PaginationServiceProviderpublic function register(){Paginator::viewFactoryResolver(function () {return $this->app['view'];});Paginator::currentPathResolver(function () {return $this->app['request']->url();});Paginator::currentPageResolver(function ($pageName = 'page') {$page = $this->app['request']->input($pageName);if (filter_var($page, FILTER_VALIDATE_INT) !== false && (int) $page >= 1) {return (int) $page;}return 1;});}リクエストパラメータ ${pageName} を取得](/image.pl?url=https%3a%2f%2fimage.slidesharecdn.com%2flaravelpaginate-180626153902%2f85%2fLaravel-paginate-30-320.jpg&f=jpg&w=240)
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Laravel の paginate は一体何をやっているのか
- 1.Laravel の paginate は一体何をやっているのか第127回 PHP勉強会＠東京
- 2.岡田 正平（おかだ しょうへい）@okashoi• 株式会社ウィルゲート 2015年新卒入社• 開発室 ソリューションユニット 所属• PHP, Laravel, Vue.js2自己紹介Slides:
- 3.① Laravel の paginate は何をやっているのか• タイトル通り② フレームワークのソースコードの追うときの思考プロセス3このスライドでつたえたい
- 5.// Controller にて$users = App¥User::paginate(15);{{-- blade template にて --}}<div class="container">@foreach ($users as $user){{ $user->name }}@endforeach</div>{{ $users->links() }}
- 6.// Controller にて$users = App¥User::paginate(15);{{-- blade template にて --}}<div class="container">@foreach ($users as $user){{ $user->name }}@endforeach</div>{{ $users->links() }}
- 8.routing を触らずに ページネーション用の URL (?page=x) が生まれる• 勝手に routing が生成される？だけでいい感じにページネーションのリンクが生まれる8なんか気持ち悪い……$users->links()
- 9.……
- 10.// Controller にて$users = App¥User::paginate(15);{{-- blade template にて --}}<div class="container">@foreach ($users as $user){{ $user->name }}@endforeach</div>{{ $users->links() }}
- 11.// Controller にて$users = App¥User::paginate(15);{{-- blade template にて --}}<div class="container">@foreach ($users as $user){{ $user->name }}@endforeach</div>{{ $users->links() }}
- 12.• の戻り値• ページネーションに必要な情報を持っている• もこのクラスに生えている12¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);¥Illuminate¥Database¥Query¥Builder::paginate()links()
- 13.• の戻り値• ページネーションに必要な情報を持っている• もこのクラスに生えている13¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);¥Illuminate¥Database¥Query¥Builder::paginate()links()
- 14.14¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);
- 16.16¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);
- 17.17¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);DBから取得できる（わかる）
- 18.18¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);DBから取得できる（わかる）引数でもらう（わかる）
- 19.19¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);DBから取得できる（わかる）引数でもらう（わかる）算出できる（わかる）
- 20.20¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);DBから取得できる（わかる）引数でもらう（わかる）算出できる（わかる）？？（わからない）
- 22.• の戻り値• ページネーションに必要な情報を持っている• もこのクラスに生えている22¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);¥Illuminate¥Database¥Query¥Builder::paginate()links()
- 23.23¥Illuminate¥Database¥Query¥Builder::paginate()public function paginate($perPage = 15, $columns = ['*'], $pageName = 'page', $page = null){$page = $page ?: Paginator::resolveCurrentPage($pageName);$total = $this->getCountForPagination($columns);$results = $total ? $this->forPage($page, $perPage)->get($columns) : collect();return $this->paginator($results, $total, $perPage, $page, ['path' => Paginator::resolveCurrentPath(),'pageName' => $pageName,]);}
- 24.24¥Illuminate¥Database¥Query¥Builder::paginate()public function paginate($perPage = 15, $columns = ['*'], $pageName = 'page', $page = null){$page = $page ?: Paginator::resolveCurrentPage($pageName);$total = $this->getCountForPagination($columns);$results = $total ? $this->forPage($page, $perPage)->get($columns) : collect();return $this->paginator($results, $total, $perPage, $page, ['path' => Paginator::resolveCurrentPath(),'pageName' => $pageName,]);}currentPage を解決してそう
- 25.25¥Illuminate¥Pagination¥AbstractPaginatorpublic static function resolveCurrentPage($pageName = 'page', $default = 1){if (isset(static::$currentPageResolver)) {return call_user_func(static::$currentPageResolver, $pageName);}return $default;}/*** Set the current page resolver callback.** @param ¥Closure $resolver* @return void*/public static function currentPageResolver(Closure $resolver){static::$currentPageResolver = $resolver;}
- 26.26¥Illuminate¥Pagination¥AbstractPaginatorpublic static function resolveCurrentPage($pageName = 'page', $default = 1){if (isset(static::$currentPageResolver)) {return call_user_func(static::$currentPageResolver, $pageName);}return $default;}/*** Set the current page resolver callback.** @param ¥Closure $resolver* @return void*/public static function currentPageResolver(Closure $resolver){static::$currentPageResolver = $resolver;}$currentPageResolver を呼び出している$currentPageResolver は……？
- 27.27¥Illuminate¥Pagination¥AbstractPaginatorpublic static function resolveCurrentPage($pageName = 'page', $default = 1){if (isset(static::$currentPageResolver)) {return call_user_func(static::$currentPageResolver, $pageName);}return $default;}/*** Set the current page resolver callback.** @param ¥Closure $resolver* @return void*/public static function currentPageResolver(Closure $resolver){static::$currentPageResolver = $resolver;}ここでセットされてる！
- 28.順当にクラス定義をさかのぼって行くと、ここで行き止まる＝ の呼び出し箇所が見つからない→ Laravel には ServiceProvider という仕組みがある• アプリケーションの各所初期処理が行われる場所28行き止まり？Paginator::currentPageResolver()
- 29.29¥Illuminate¥Pagination¥PaginationServiceProviderpublic function register(){Paginator::viewFactoryResolver(function () {return $this->app['view'];});Paginator::currentPathResolver(function () {return $this->app['request']->url();});Paginator::currentPageResolver(function ($pageName = 'page') {$page = $this->app['request']->input($pageName);if (filter_var($page, FILTER_VALIDATE_INT) !== false && (int) $page >= 1) {return (int) $page;}return 1;});}
- 30.30¥Illuminate¥Pagination¥PaginationServiceProviderpublic function register(){Paginator::viewFactoryResolver(function () {return $this->app['view'];});Paginator::currentPathResolver(function () {return $this->app['request']->url();});Paginator::currentPageResolver(function ($pageName = 'page') {$page = $this->app['request']->input($pageName);if (filter_var($page, FILTER_VALIDATE_INT) !== false && (int) $page >= 1) {return (int) $page;}return 1;});}リクエストパラメータ ${pageName} を取得
- 31.31¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);DBから取得できる（わかる）引数でもらう（わかる）算出できる（わかる）？？（わからない）
- 32.32¥Illuminate¥Pagination¥LengthAwarePaginator// Controller にて$users = App¥User::paginate(15);DBから取得できる（わかる）引数でもらう（わかる）算出できる（わかる）わかった！
- 34.• Laravel の paginate は一見アクロバティックだが意外と副作用が無い形になっていた• Laravel のコードを追って行ってabstract class や interface で行き止まったらそれっぽい ServiceProvider を探すと良い• こういうの調査するのに PhpStorm が便利！（Go To Declaration）• 要 larvae-ide-helperhttps://github.com/barryvdh/laravel-ide-helper34まとめ