{"id":813,"date":"2010-10-10T13:43:00","date_gmt":"2010-10-10T16:43:00","guid":{"rendered":"https:\/\/devkico.itexto.com.br\/?p=813"},"modified":"2010-10-10T13:43:00","modified_gmt":"2010-10-10T16:43:00","slug":"dica-grails-parametros-com-nomes-duplicados","status":"publish","type":"post","link":"https:\/\/devkico.itexto.com.br\/?p=813","title":{"rendered":"Dica Grails: par\u00e2metros com nomes duplicados"},"content":{"rendered":"<p><a href=\"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/02\/grails_logo.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-604\" style=\"margin: 10px;\" title=\"grails_logo\" src=\"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/02\/grails_logo.png\" alt=\"\" width=\"163\" height=\"43\" \/><\/a>H\u00e1 situa\u00e7\u00f5es nas quais \u00e9 interessante ter mais de um par\u00e2metro passado ao nosso controlador com o mesmo nome. Para ilustrar a situa\u00e7\u00e3o, eis um exemplo: imagine que voc\u00ea deseje criar um sistema de cota\u00e7\u00e3o de itens aonde seja interessante fornecer ao usu\u00e1rio a possibilidade de cadastrar mais de um pre\u00e7o de uma \u00fanica vez.<\/p>\n<p>Vamos imaginar que a classe de dom\u00ednio que desejamos popular seja a exposta no c\u00f3digo abaixo:<\/p>\n<pre class=\"brush: java; title: ; notranslate\" title=\"\">\r\n\r\nclass Cotacao {\r\n\r\nString nome\r\n\r\nBigDecimal valor\r\n\r\n\/\/ ignoraremos o restante da classe apenas para manter a simplicidade ok?\r\n\r\n}\r\n\r\n<\/pre>\n<p>O usu\u00e1rio ir\u00e1 fornecer o nome parcial dos itens cujos pre\u00e7os queremos editar e n\u00f3s exporemos os dados no formul\u00e1rio como uma tabela. O controlador que envia os dados para a camada de visualiza\u00e7\u00e3o possui uma action tal como a exposta abaixo:<\/p>\n<pre class=\"brush: java; title: ; notranslate\" title=\"\">\r\n\r\nclass CotacaoController {\r\n\r\ndef editarCotacoes = {\r\n\r\n&#x5B;cotacoes: Cotacao.findAllByNomeLike(&quot;%${params.valorBusca}%&quot;)]\r\n\r\n}\r\n\r\n}\r\n\r\n<\/pre>\n<p>E a nossa p\u00e1gina GSP, bem bobona, possui um formul\u00e1rio tal como o abaixo:<\/p>\n<pre class=\"brush: java; title: ; notranslate\" title=\"\">\r\n\r\n&lt;g:form action=&quot;updateCotacoes&quot;&gt;\r\n\r\n&lt;table&gt;\r\n\r\n&lt;g:each in=&quot;${cotacoes}&quot; var=&quot;cotacao&quot;&gt;\r\n\r\n&lt;tr&gt;\r\n\r\n&lt;td&gt;${cotacao.nome}&lt;\/td&gt;\r\n\r\n&lt;td&gt;&lt;input type=&quot;text&quot; name=&quot;valor&quot; value=&quot;${cotacao.valor}&quot;\/&gt;&lt;\/td&gt;\r\n\r\n&lt;input type=&quot;hidden&quot; name=&quot;id&quot; value=&quot;${cotacao.id}&quot;\/&gt;\r\n\r\n&lt;\/tr&gt;\r\n\r\n&lt;\/g:each&gt;\r\n\r\n&lt;\/table&gt;\r\n\r\n&lt;input type=&quot;submit&quot; value=&quot;Editar em massa!&quot;\/&gt;\r\n\r\n&lt;\/g:form&gt;\r\n\r\n<\/pre>\n<p>Como pode ser visto, neste formulario os campos valor e id ir\u00e3o ser repetidos n vezes, aonde n representa o n\u00famero de cota\u00e7\u00f5es presentes na lista que enviamos para a camada de visualiza\u00e7\u00e3o. Como tratar desta situa\u00e7\u00e3o no controlador?<\/p>\n<p>\u00c9 muito f\u00e1cil. Quando trabalha com parametros com nomes repetidos, para obter a lista dos valores na ordem em que eles s\u00e3o expostos na p\u00e1gina, basta usar a fun\u00e7\u00e3o list do objeto params usando como parametro o nome da vari\u00e1vel com a qual queremos trabalhar, na action abaixo voc\u00ea pode ver como \u00e9 simples.<\/p>\n<pre class=\"brush: java; title: ; notranslate\" title=\"\">\r\n\r\ndef updateCotacoes = {\r\n\r\ndef ids = params.list('id')\r\ndef valores = params.list('valor')\r\n\r\nfor (i in 0..(ids.size() - 1)) {\r\n\r\ndef cotacao = Cotacao.get(ids&#x5B;i])\r\n\r\ncotacao.valor = valores&#x5B;i]\r\n\r\ncotacao.save()\r\n\r\n}\r\n\r\n}\r\n\r\n<\/pre>\n<p>Sim, \u00e9 uma action bem feia, mas ilustra bem o recurso. :D<\/p>\n","protected":false},"excerpt":{"rendered":"<p>H\u00e1 situa\u00e7\u00f5es nas quais \u00e9 interessante ter mais de um par\u00e2metro passado ao nosso controlador com o mesmo nome. Para ilustrar a situa\u00e7\u00e3o, eis um exemplo: imagine que voc\u00ea deseje criar um sistema de cota\u00e7\u00e3o de itens aonde seja interessante fornecer ao usu\u00e1rio a possibilidade de cadastrar mais de um pre\u00e7o de uma \u00fanica vez. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3,30],"tags":[],"class_list":["post-813","post","type-post","status-publish","format-standard","hentry","category-grails","category-grails-guia-rapido-e-indireto"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Dica Grails: par\u00e2metros com nomes duplicados - \/dev\/Kico<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/devkico.itexto.com.br\/?p=813\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dica Grails: par\u00e2metros com nomes duplicados - \/dev\/Kico\" \/>\n<meta property=\"og:description\" content=\"H\u00e1 situa\u00e7\u00f5es nas quais \u00e9 interessante ter mais de um par\u00e2metro passado ao nosso controlador com o mesmo nome. Para ilustrar a situa\u00e7\u00e3o, eis um exemplo: imagine que voc\u00ea deseje criar um sistema de cota\u00e7\u00e3o de itens aonde seja interessante fornecer ao usu\u00e1rio a possibilidade de cadastrar mais de um pre\u00e7o de uma \u00fanica vez. [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/devkico.itexto.com.br\/?p=813\" \/>\n<meta property=\"og:site_name\" content=\"\/dev\/Kico\" \/>\n<meta property=\"article:published_time\" content=\"2010-10-10T16:43:00+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.itexto.net\/devkico\/wp-content\/uploads\/2010\/02\/grails_logo.png\" \/>\n<meta name=\"author\" content=\"Kico (Henrique Lobo Weissmann)\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@loboweissmann\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kico (Henrique Lobo Weissmann)\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/devkico.itexto.com.br\/?p=813\",\"url\":\"https:\/\/devkico.itexto.com.br\/?p=813\",\"name\":\"Dica Grails: par\u00e2metros com nomes duplicados - \/dev\/Kico\",\"isPartOf\":{\"@id\":\"https:\/\/devkico.itexto.com.br\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/devkico.itexto.com.br\/?p=813#primaryimage\"},\"image\":{\"@id\":\"https:\/\/devkico.itexto.com.br\/?p=813#primaryimage\"},\"thumbnailUrl\":\"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/02\/grails_logo.png\",\"datePublished\":\"2010-10-10T16:43:00+00:00\",\"dateModified\":\"2010-10-10T16:43:00+00:00\",\"author\":{\"@id\":\"https:\/\/devkico.itexto.com.br\/#\/schema\/person\/502ab8892631bb005d6da2269fe5a3a7\"},\"breadcrumb\":{\"@id\":\"https:\/\/devkico.itexto.com.br\/?p=813#breadcrumb\"},\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/devkico.itexto.com.br\/?p=813\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-BR\",\"@id\":\"https:\/\/devkico.itexto.com.br\/?p=813#primaryimage\",\"url\":\"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/02\/grails_logo.png\",\"contentUrl\":\"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/02\/grails_logo.png\",\"width\":\"163\",\"height\":\"43\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/devkico.itexto.com.br\/?p=813#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/devkico.itexto.com.br\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Dica Grails: par\u00e2metros com nomes duplicados\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/devkico.itexto.com.br\/#website\",\"url\":\"https:\/\/devkico.itexto.com.br\/\",\"name\":\"\/dev\/Kico\",\"description\":\"Desenvolvendo software\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/devkico.itexto.com.br\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-BR\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/devkico.itexto.com.br\/#\/schema\/person\/502ab8892631bb005d6da2269fe5a3a7\",\"name\":\"Kico (Henrique Lobo Weissmann)\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-BR\",\"@id\":\"https:\/\/devkico.itexto.com.br\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/dd6973d86a689bc63122b2e603f25be3?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/dd6973d86a689bc63122b2e603f25be3?s=96&d=mm&r=g\",\"caption\":\"Kico (Henrique Lobo Weissmann)\"},\"sameAs\":[\"https:\/\/x.com\/loboweissmann\"],\"url\":\"https:\/\/devkico.itexto.com.br\/?author=1\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Dica Grails: par\u00e2metros com nomes duplicados - \/dev\/Kico","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/devkico.itexto.com.br\/?p=813","og_locale":"pt_BR","og_type":"article","og_title":"Dica Grails: par\u00e2metros com nomes duplicados - \/dev\/Kico","og_description":"H\u00e1 situa\u00e7\u00f5es nas quais \u00e9 interessante ter mais de um par\u00e2metro passado ao nosso controlador com o mesmo nome. Para ilustrar a situa\u00e7\u00e3o, eis um exemplo: imagine que voc\u00ea deseje criar um sistema de cota\u00e7\u00e3o de itens aonde seja interessante fornecer ao usu\u00e1rio a possibilidade de cadastrar mais de um pre\u00e7o de uma \u00fanica vez. [&hellip;]","og_url":"https:\/\/devkico.itexto.com.br\/?p=813","og_site_name":"\/dev\/Kico","article_published_time":"2010-10-10T16:43:00+00:00","og_image":[{"url":"http:\/\/www.itexto.net\/devkico\/wp-content\/uploads\/2010\/02\/grails_logo.png"}],"author":"Kico (Henrique Lobo Weissmann)","twitter_card":"summary_large_image","twitter_creator":"@loboweissmann","twitter_misc":{"Escrito por":"Kico (Henrique Lobo Weissmann)","Est. tempo de leitura":"2 minutos"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/devkico.itexto.com.br\/?p=813","url":"https:\/\/devkico.itexto.com.br\/?p=813","name":"Dica Grails: par\u00e2metros com nomes duplicados - \/dev\/Kico","isPartOf":{"@id":"https:\/\/devkico.itexto.com.br\/#website"},"primaryImageOfPage":{"@id":"https:\/\/devkico.itexto.com.br\/?p=813#primaryimage"},"image":{"@id":"https:\/\/devkico.itexto.com.br\/?p=813#primaryimage"},"thumbnailUrl":"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/02\/grails_logo.png","datePublished":"2010-10-10T16:43:00+00:00","dateModified":"2010-10-10T16:43:00+00:00","author":{"@id":"https:\/\/devkico.itexto.com.br\/#\/schema\/person\/502ab8892631bb005d6da2269fe5a3a7"},"breadcrumb":{"@id":"https:\/\/devkico.itexto.com.br\/?p=813#breadcrumb"},"inLanguage":"pt-BR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/devkico.itexto.com.br\/?p=813"]}]},{"@type":"ImageObject","inLanguage":"pt-BR","@id":"https:\/\/devkico.itexto.com.br\/?p=813#primaryimage","url":"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/02\/grails_logo.png","contentUrl":"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/02\/grails_logo.png","width":"163","height":"43"},{"@type":"BreadcrumbList","@id":"https:\/\/devkico.itexto.com.br\/?p=813#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/devkico.itexto.com.br\/"},{"@type":"ListItem","position":2,"name":"Dica Grails: par\u00e2metros com nomes duplicados"}]},{"@type":"WebSite","@id":"https:\/\/devkico.itexto.com.br\/#website","url":"https:\/\/devkico.itexto.com.br\/","name":"\/dev\/Kico","description":"Desenvolvendo software","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/devkico.itexto.com.br\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"pt-BR"},{"@type":"Person","@id":"https:\/\/devkico.itexto.com.br\/#\/schema\/person\/502ab8892631bb005d6da2269fe5a3a7","name":"Kico (Henrique Lobo Weissmann)","image":{"@type":"ImageObject","inLanguage":"pt-BR","@id":"https:\/\/devkico.itexto.com.br\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/dd6973d86a689bc63122b2e603f25be3?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/dd6973d86a689bc63122b2e603f25be3?s=96&d=mm&r=g","caption":"Kico (Henrique Lobo Weissmann)"},"sameAs":["https:\/\/x.com\/loboweissmann"],"url":"https:\/\/devkico.itexto.com.br\/?author=1"}]}},"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/devkico.itexto.com.br\/index.php?rest_route=\/wp\/v2\/posts\/813"}],"collection":[{"href":"https:\/\/devkico.itexto.com.br\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devkico.itexto.com.br\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devkico.itexto.com.br\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/devkico.itexto.com.br\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=813"}],"version-history":[{"count":3,"href":"https:\/\/devkico.itexto.com.br\/index.php?rest_route=\/wp\/v2\/posts\/813\/revisions"}],"predecessor-version":[{"id":816,"href":"https:\/\/devkico.itexto.com.br\/index.php?rest_route=\/wp\/v2\/posts\/813\/revisions\/816"}],"wp:attachment":[{"href":"https:\/\/devkico.itexto.com.br\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=813"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devkico.itexto.com.br\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=813"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devkico.itexto.com.br\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=813"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}