{"id":3076,"date":"2024-12-05T09:10:28","date_gmt":"2024-12-05T12:10:28","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=3076"},"modified":"2025-12-06T11:57:23","modified_gmt":"2025-12-06T14:57:23","slug":"laravel-collections","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/laravel-collections\/","title":{"rendered":"Laravel Collections"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Laravel Collections<\/strong> s\u00e3o uma abstra\u00e7\u00e3o poderosa para manipular <em>arrays<\/em> de dados. Elas fornecem uma interface <strong>fluente<\/strong> (encadeada) e expressiva que simplifica opera\u00e7\u00f5es complexas de manipula\u00e7\u00e3o de conjuntos de dados, como filtragem, mapeamento e redu\u00e7\u00e3o. Essencialmente, uma <em>Collection<\/em> \u00e9 um objeto que envolve um <em>array<\/em> PHP e o estende com dezenas de m\u00e9todos \u00fateis.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Dominar as Collections acabaca sendo fundamental para escrever c\u00f3digo <strong>Laravel<\/strong> limpo, conciso e com alta performance.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">1. \ud83d\udcdd Criando e Obtendo Collections<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">No Laravel, o <em>helper<\/em> global <strong><code>collect()<\/code><\/strong> \u00e9 a maneira mais comum de instanciar uma Collection.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">A. Fontes de Dados<\/h3>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Fonte<\/strong><\/td><td><strong>M\u00e9todo<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Array Puro<\/strong><\/td><td><em>Helper<\/em> <code>collect()<\/code><\/td><td><code>$c = collect([1, 2, 3]);<\/code><\/td><\/tr><tr><td><strong>Consulta DB<\/strong><\/td><td><code>DB::table(...)-&gt;get()<\/code><\/td><td>O Laravel retorna nativamente um objeto Collection.<\/td><\/tr><tr><td><strong>Relacionamentos Eloquent<\/strong><\/td><td>Propriedade de relacionamento.<\/td><td><code>$user-&gt;posts<\/code> retorna uma Collection.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">B. O Objeto Collection<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Um objeto Collection sempre permite o acesso ao <em>array<\/em> PHP subjacente atrav\u00e9s do m\u00e9todo <strong><code>-&gt;all()<\/code><\/strong>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>use Illuminate\\Support\\Collection;\n\n$collection = collect(&#91;'apple', 'banana', 'cherry']);\n\n\/\/ Obt\u00e9m o array PHP\n$array = $collection-&gt;all(); \/\/ &#91;'apple', 'banana', 'cherry']\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u2728 M\u00e9todos Essenciais de Manipula\u00e7\u00e3o<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Os m\u00e9todos de Collection geralmente retornam uma <strong>nova Collection<\/strong>, permitindo que voc\u00ea encadeie opera\u00e7\u00f5es sem alterar a Collection original (o que \u00e9 chamado de <strong>Imutabilidade<\/strong>).<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">A. Transforma\u00e7\u00e3o<\/h3>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>M\u00e9todo<\/strong><\/td><td><strong>Fun\u00e7\u00e3o<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>map()<\/code><\/strong><\/td><td>Aplica um <em>callback<\/em> a cada item, retornando uma nova Collection dos resultados.<\/td><td><code>$nomes = $users-&gt;map(fn($u) =&gt; $u-&gt;name);<\/code><\/td><\/tr><tr><td><strong><code>pluck()<\/code><\/strong><\/td><td>Extrai os valores de uma chave espec\u00edfica de todos os itens.<\/td><td><code>$ids = $users-&gt;pluck('id');<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">B. Filtragem e Agrupamento<\/h3>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>M\u00e9todo<\/strong><\/td><td><strong>Fun\u00e7\u00e3o<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>filter()<\/code><\/strong><\/td><td>Retorna itens que satisfazem uma condi\u00e7\u00e3o.<\/td><td><code>$ativos = $users-&gt;filter(fn($u) =&gt; $u-&gt;status === 'active');<\/code><\/td><\/tr><tr><td><strong><code>where()<\/code><\/strong><\/td><td>Filtragem simples com base em pares chave\/valor.<\/td><td><code>$ativos = $users-&gt;where('status', 'active');<\/code><\/td><\/tr><tr><td><strong><code>groupBy()<\/code><\/strong><\/td><td>Agrupa a Collection por um valor de chave.<\/td><td><code>$grouped = $posts-&gt;groupBy('category_id');<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">C. Redu\u00e7\u00e3o<\/h3>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>M\u00e9todo<\/strong><\/td><td><strong>Fun\u00e7\u00e3o<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>reduce()<\/code><\/strong><\/td><td>Reduz a Collection a um \u00fanico valor.<\/td><td><code>$somaSalarios = $users-&gt;reduce(fn($carry, $u) =&gt; $carry + $u-&gt;salary, 0);<\/code><\/td><\/tr><tr><td><strong><code>sum()<\/code><\/strong><\/td><td>Soma todos os valores ou os valores de uma chave.<\/td><td><code>$total = $orders-&gt;sum('amount');<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">D. Ordena\u00e7\u00e3o e Busca<\/h3>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>M\u00e9todo<\/strong><\/td><td><strong>Fun\u00e7\u00e3o<\/strong><\/td><td><strong>Exemplo<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>sortBy()<\/code><\/strong><\/td><td>Ordena a Collection por uma chave.<\/td><td><code>$sorted = $users-&gt;sortBy('name');<\/code><\/td><\/tr><tr><td><strong><code>first()<\/code> \/ <code>last()<\/code><\/strong><\/td><td>Retorna o primeiro\/\u00faltimo item que satisfaz a condi\u00e7\u00e3o (opcional).<\/td><td><code>$firstAdmin = $users-&gt;first(fn($u) =&gt; $u-&gt;isAdmin);<\/code><\/td><\/tr><tr><td><strong><code>contains()<\/code><\/strong><\/td><td>Verifica se a Collection cont\u00e9m um valor ou satisfaz um <em>callback<\/em>.<\/td><td><code>if ($users-&gt;contains('name', 'John Doe')) { \/* ... *\/ }<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">3. \ud83d\ude34 Lazy Collections (Processamento de Grandes Dados)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">As <strong>Lazy Collections<\/strong> (<code>Illuminate\\Support\\LazyCollection<\/code>) s\u00e3o a solu\u00e7\u00e3o do Laravel para lidar com <strong>grandes conjuntos de dados<\/strong> sem esgotar a mem\u00f3ria da aplica\u00e7\u00e3o.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">A. O Problema da Mem\u00f3ria (<em>Eager<\/em>)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Uma Collection normal (<code>collect()<\/code>) \u00e9 <strong><em>eager<\/em><\/strong> (\u00e1vida): ela carrega <strong>todos<\/strong> os dados do <em>array<\/em> na mem\u00f3ria imediatamente.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">B. A Solu\u00e7\u00e3o Lazy (<em>Deferred<\/em>)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Uma Lazy Collection \u00e9 <strong>diferida<\/strong> (ou <em>deferred<\/em>): ela s\u00f3 processa e carrega cada item <strong>\u00e0 medida que ele \u00e9 solicitado<\/strong> (iterado). A chave \u00e9 que ela <strong>n\u00e3o carrega todos os 10.000 registros na mem\u00f3ria de uma vez<\/strong>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Voc\u00ea cria uma Lazy Collection a partir de um gerador (como o <code>cursor()<\/code> do Eloquent).<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ 1. Usando o cursor() do Eloquent\n\/\/ $users agora \u00e9 uma Lazy Collection que buscar\u00e1 do DB um item por vez\n$lazyUsers = App\\Models\\User::cursor(); \n\n\/\/ 2. Criando a partir de um array existente:\n$lazyCollection = collect($usersArray)-&gt;lazy();\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Exemplo de Uso Lazy<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$sumOfActiveSalaries = $lazyUsers\n    \/\/ Filtra o primeiro item, processa, vai para o pr\u00f3ximo...\n    -&gt;filter(fn($user) =&gt; $user-&gt;is_active) \n    \/\/ Mapeia o primeiro item filtrado, processa, vai para o pr\u00f3ximo...\n    -&gt;map(fn($user) =&gt; $user-&gt;salary) \n    \/\/ Apenas agora \u00e9 que o valor final (a soma) \u00e9 calculado.\n    -&gt;sum(); \n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Nota:<\/strong> Se voc\u00ea chamar um m\u00e9todo que requer a cole\u00e7\u00e3o inteira (como <code>count()<\/code> ou <code>sortBy()<\/code>), a natureza <em>lazy<\/em> ser\u00e1 perdida, e todos os dados ser\u00e3o carregados na mem\u00f3ria.<\/p>\n<\/blockquote>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\u2705 Conclus\u00e3o <strong>Laravel Collections<\/strong><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Laravel Collections<\/strong>: As Collections s\u00e3o a forma do Laravel para manipula\u00e7\u00e3o de dados, oferecendo uma API <strong>fluente<\/strong> e <strong>intuitiva<\/strong> que substitui a necessidade de estruturas de <em>loop<\/em> e <em>array<\/em> complexas. Para otimizar o consumo de mem\u00f3ria em opera\u00e7\u00f5es com grandes volumes de dados, o uso de <strong>Lazy Collections<\/strong> (via <code>Model::cursor()<\/code>) \u00e9 a melhor pr\u00e1tica para o desenvolvedor Laravel moderno.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Mas antes de dominar o Laravel, se for o seu caso, toda jornada tem um in\u00edcio. Vamos entender quais s\u00e3o os conhecimentos b\u00e1sicos necess\u00e1rios para aproveitar ao m\u00e1ximo este poderoso framework. Para iniciar seus estudos no Laravel, voc\u00ea precisar\u00e1 dominar as seguintes tecnologias:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/html\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html.webp\" alt=\"HTML\" class=\"wp-image-600\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">HTML<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/css\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux.webp\" alt=\"CSS\" class=\"wp-image-702\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">CSS<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/javascript\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript.webp\" alt=\"Javascript\" class=\"wp-image-804\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">JavaScript<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/sql\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/05\/Capa-Artigos-2.webp\" alt=\"SQL\" class=\"wp-image-942\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/05\/Capa-Artigos-2.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/05\/Capa-Artigos-2-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">SQL<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/php\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Capa-PHP.png\" alt=\"Capa Curso PHP\" class=\"wp-image-2835\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Capa-PHP.png 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Capa-PHP-300x169.png 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">PHP<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">E se voc\u00ea gosta do nosso conte\u00fado, n\u00e3o deixe de contribuir adquirindo os servi\u00e7os e produtos dos nossos apoiadores e empresas que somos associados:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/hostinger.com.br\/?REFERRALCODE=1THIAGO62\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/03\/hostinger.png\" alt=\"Hospedagem Hostinger\" class=\"wp-image-92\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNDYlc\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/ofertas-amazon.webp\" alt=\"Ofertas Amazon\" class=\"wp-image-1308\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNKmt0\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/amazonprime.webp\" alt=\"Amazon Prime\" class=\"wp-image-1307\"\/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>Laravel Collections s\u00e3o uma abstra\u00e7\u00e3o poderosa para manipular arrays de dados. Elas fornecem uma interface&#8230;<\/p>\n","protected":false},"author":1,"featured_media":1642,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-3076","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laravel","wpcat-18-id"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Laravel Collections - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Laravel Collections: Neste artigo, vamos explorar em detalhes o que s\u00e3o as Laravel Collections, como cri\u00e1-las, os m\u00e9todos mais utilizados e...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thiagorossi.com.br\/blog\/laravel-collections\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Laravel Collections - 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