{"id":2171,"date":"2016-02-25T15:00:00","date_gmt":"2016-02-25T15:00:00","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2171"},"modified":"2025-06-13T21:40:28","modified_gmt":"2025-06-14T04:40:28","slug":"load-nested-models-with-ottoman-when-a-parent-model-is-found-in-nodejs","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/load-nested-models-with-ottoman-when-a-parent-model-is-found-in-nodejs\/","title":{"rendered":"Carregar modelos aninhados com Ottoman quando um modelo pai \u00e9 encontrado no Node.js"},"content":{"rendered":"<p>Anteriormente, escrevi sobre <a href=\"https:\/\/www.couchbase.com\/blog\/pt\/easily-develop-node.js-and-couchbase-apps-with-ottoman\/\">facilmente<br \/>\nDesenvolvimento de aplicativos Node.js e Couchbase usando o Ottoman<\/a> para a ODM. Essa postagem foi apenas uma amostra do que a Ottoman pode fazer e de como voc\u00ea pode fazer isso.<br \/>\npode ser comparado \u00e0s coisas que o Mongoose pode fazer com o MongoDB.<\/p>\n<p>Desta vez, vamos dar um passo adiante e ver alguns casos de uso que fazem o Ottoman brilhar.<\/p>\n<p>O SDK do Node.js para o Couchbase tem muitas maneiras diferentes de trabalhar com documentos. Opera\u00e7\u00f5es CRUD, consultas N1QL, visualiza\u00e7\u00f5es do Couchbase, essas<br \/>\ns\u00e3o \u00f3timas coisas para usar, mas o que acontece quando seus dados ficam realmente selvagens. Por selvagem, quero dizer que voc\u00ea tem documentos com refer\u00eancias<br \/>\nrelacionamentos e estruturas complexas. Voc\u00ea poderia usar as visualiza\u00e7\u00f5es do Couchbase e as opera\u00e7\u00f5es CRUD, mas se os seus relacionamentos forem complexos, voc\u00ea ter\u00e1 que fazer o mesmo.<br \/>\nter\u00e1 muito c\u00f3digo Node.js para manipula\u00e7\u00e3o de dados. Voc\u00ea poderia usar consultas N1QL, mas, com relacionamentos complexos, voc\u00ea ter\u00e1<br \/>\npara ficar com consultas enormes e complicadas com muitas jun\u00e7\u00f5es. O que fazer?<\/p>\n<h2>Alguns exemplos de modelagem<\/h2>\n<p>Digamos que estejamos trabalhando com os seguintes modelos de documentos. Vamos supor que esse aplicativo seja algum tipo de gerenciamento de projetos<br \/>\nAplica\u00e7\u00e3o.<\/p>\n<h3>Um modelo de projeto<\/h3>\n<p>Como estamos criando projetos, n\u00e3o precisaremos apenas de informa\u00e7\u00f5es sobre o projeto em si, mas tamb\u00e9m sobre quem faz parte dele. Pegue o<br \/>\nseguindo o modelo otomano como exemplo:<\/p>\n<pre><code>\r\nvar ProjectMdl = ottoman.model(\"Project\", {\r\n    name: \"string\",\r\n    description: \"string\",\r\n    owner: { ref: \"User\" },\r\n    users: [\r\n        { ref: \"User\" }\r\n    ]\r\n});\r\n<\/code><\/pre>\n<p>No modelo acima, o <code>propriet\u00e1rio<\/code> \u00e9 um modelo otomano diferente chamado <strong>Usu\u00e1rio<\/strong>, mas o <code>usu\u00e1rios<\/code> \u00e9 um<br \/>\nmatriz desse <strong>Usu\u00e1rio<\/strong> modelo.<\/p>\n<h3>Um modelo de usu\u00e1rio<\/h3>\n<p>Com o modelo de projeto em vigor, precisamos definir o modelo de usu\u00e1rio no Ottoman. Ele pode ser parecido com o seguinte:<\/p>\n<pre><code>\r\nvar UserMdl = ottoman.model(\"User\", {\r\n    name: {\r\n        first: \"string\",\r\n        last: \"string\"\r\n    },\r\n    email: \"string\"\r\n});\r\n<\/code><\/pre>\n<p>O modelo de usu\u00e1rio acima \u00e9 apenas um dado de string padr\u00e3o. N\u00e3o h\u00e1 refer\u00eancias a outros modelos, como vimos no modelo de projeto. Agora n\u00f3s<br \/>\nprecisa se preocupar em consultar esses dois modelos da melhor maneira poss\u00edvel.<\/p>\n<h2>Consulta de profundidade com otomano<\/h2>\n<p>Digamos que queremos consultar os projetos em nosso aplicativo. Normalmente, essa consulta seria parecida com a seguinte:<\/p>\n<pre><code>\r\nProjectMdl.getById(\"ID_HERE\", function(error, project) {\r\n    if(error) {\r\n        return res.status(400).send(error);\r\n    }\r\n    res.send(project);\r\n});\r\n<\/code><\/pre>\n<p>Os resultados dessa consulta podem ser parecidos com os seguintes:<\/p>\n<pre><code>\r\n{\r\n    name: \"My Project\",\r\n    description: \"This is a description to my project\",\r\n    owner: {\r\n        \"_type\": \"user\",\r\n        \"$ref\": \"1234\"\r\n    },\r\n    users: [\r\n        {\r\n            \"_type\": \"user\",\r\n            \"$ref\": \"1234\"\r\n        },\r\n        {\r\n            \"_type\": \"user\",\r\n            \"$ref\": \"4321\"\r\n        }\r\n    ]\r\n}\r\n<\/code><\/pre>\n<p>O que h\u00e1 de errado aqui? Bem, a consulta carregou apenas uma pequena quantidade de dados. Por exemplo, nenhuma das informa\u00e7\u00f5es reais do usu\u00e1rio foi carregada,<br \/>\napenas as refer\u00eancias a esses documentos do usu\u00e1rio.<\/p>\n<p>Ent\u00e3o, como podemos fazer uma consulta profunda dos outros documentos? D\u00ea uma olhada nesta revis\u00e3o da nossa consulta:<\/p>\n<pre><code>\r\nProjectMdl.getById(\"ID_HERE\", {load: [\"users\"]}, function(error, project) {\r\n    if(error) {\r\n        return res.status(400).send(error);\r\n    }\r\n    res.send(project);\r\n});\r\n<\/code><\/pre>\n<p>Observe o uso de <code>{load: [\"users\"]}<\/code> neste caso. Isso significa que queremos carregar todos os modelos de usu\u00e1rio na matriz<br \/>\nquando executamos nossa consulta. E se quis\u00e9ssemos carregar tamb\u00e9m os documentos do propriet\u00e1rio? Far\u00edamos algo como<br \/>\n<code>{carregar: [\"users\", \"owner\"]}<\/code> para carreg\u00e1-los tamb\u00e9m.<\/p>\n<h2>Complicando o modelo otomano<\/h2>\n<p>Agora vamos alterar um pouco nosso modelo de dados. Digamos que o modelo Ottoman do nosso projeto agora tenha a seguinte apar\u00eancia:<\/p>\n<pre><code>\r\nvar ProjectMdl = ottoman.model(\"Project\", {\r\n    name: \"string\",\r\n    description: \"string\",\r\n    owner: { ref: \"User\" },\r\n    comments: [\r\n        {\r\n            message: \"string\",\r\n            user: { ref: \"User\" }\r\n        }\r\n    ]\r\n});\r\n<\/code><\/pre>\n<p>Em vez de uma matriz de modelos Ottoman, agora estamos trabalhando com uma matriz de objetos que, por acaso, cont\u00e9m um modelo Ottoman.<\/p>\n<h2>Alterando nossa consulta de otomana profunda<\/h2>\n<p>Com a mudan\u00e7a em nosso modelo de dados, vem uma mudan\u00e7a em nossa consulta. N\u00e3o faz sentido fazer <code>{load: [\"comments\"]}<\/code> porque<br \/>\n<code>coment\u00e1rios<\/code> n\u00e3o \u00e9 um modelo otomano. N\u00e3o h\u00e1 nada para carregar. Em vez disso, temos que alterar nossa consulta para que fique assim:<\/p>\n<pre><code>\r\nProjectMdl.getById(\"ID_HERE\", {load: [\"owner\", \"comments[*].user\"]}, function(error, project) {\r\n    if(error) {\r\n        return res.status(400).send(error);\r\n    }\r\n    res.send(project);\r\n});\r\n<\/code><\/pre>\n<p>Observe o uso de <code>coment\u00e1rios[*].usu\u00e1rio<\/code> acima. Estamos carregando o modelo de usu\u00e1rio que existe em todos os elementos de objeto do<br \/>\nmatriz.<\/p>\n<h2>Conclus\u00e3o<\/h2>\n<p>Voc\u00ea acabou de ver como carregar modelos filhos em uma \u00fanica consulta. Embora seja muito poss\u00edvel usar uma consulta N1QL, isso levaria alguns<br \/>\n<code>JUNTAR<\/code> declara\u00e7\u00f5es para realizar o trabalho. Tudo depende de sua prefer\u00eancia, mas se voc\u00ea gosta da abordagem ODM, a Ottoman<br \/>\ne o <code>carregar<\/code> \u00e9 uma \u00f3tima op\u00e7\u00e3o.<\/p>\n<p>Um exemplo funcional completo disso pode ser visto no <a href=\"https:\/\/github.com\/couchbaselabs\/comply\">projeto GitHub da compiance<\/a> como<br \/>\nbem como em um <a href=\"https:\/\/www.couchbase.com\/blog\/pt\/nosql-resources\/events\/2016\/january\/building-a-full-stack-application-with-nosql-node.js-and-angular-2-us\/\">s\u00e9rie de webinars<\/a> que eu fiz sobre desenvolvimento de pilha completa.<\/p>","protected":false},"excerpt":{"rendered":"<p>Previously I wrote about easily developing Node.js and Couchbase apps using Ottoman for ODM. That post was just a taste of what Ottoman can do and how you can compare it to the things Mongoose can do with MongoDB. This [&hellip;]<\/p>","protected":false},"author":63,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1816,1822,10128,1812],"tags":[1510],"ppma_author":[9032],"class_list":["post-2171","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-couchbase-server","category-node-js","category-ottoman","category-n1ql-query","tag-odm"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.5 (Yoast SEO v26.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Load Nested Models With Ottoman When A Parent Model Is Found In Node.js - The Couchbase Blog<\/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:\/\/www.couchbase.com\/blog\/pt\/load-nested-models-with-ottoman-when-a-parent-model-is-found-in-nodejs\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Load Nested Models With Ottoman When A Parent Model Is Found In Node.js\" \/>\n<meta property=\"og:description\" content=\"Previously I wrote about easily developing Node.js and Couchbase apps using Ottoman for ODM. 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