{"id":7968,"date":"2025-05-10T10:13:09","date_gmt":"2025-05-10T13:13:09","guid":{"rendered":"https:\/\/geekblogti.wpengine.com\/?p=7968"},"modified":"2025-05-15T18:20:35","modified_gmt":"2025-05-15T21:20:35","slug":"fluent-validation-para-ter-seguranca-nas-validacoes-dos-dados","status":"publish","type":"post","link":"https:\/\/www.geekhunter.com/pt/blog\/fluent-validation-para-ter-seguranca-nas-validacoes-dos-dados\/","title":{"rendered":"Valida\u00e7\u00e3o de dados usando Fluent Validation"},"content":{"rendered":"\r\n

Usando o paradigma da orienta\u00e7\u00e3o a objetos<\/strong>, deveria ser natural iniciar o desenvolvimento pelo modelo de entidades<\/strong>, onde as classes s\u00e3o definidas para representar o dom\u00ednio do neg\u00f3cio.<\/p>\r\n\r\n\r\n\r\n

Posteriormente, e a partir destas classes, seria gerado o banco de dados<\/a> <\/strong>usado pela aplica\u00e7\u00e3o para realizar a persist\u00eancia das informa\u00e7\u00f5es.<\/p>\r\n\r\n\r\n\r\n

A realidade n\u00e3o \u00e9 bem assim. Na maioria das vezes vemos bancos de dados j\u00e1 projetados.<\/p>\r\n\r\n\r\n\r\n\r\n\r\n

O Data Annotation<\/h2>\r\n\r\n\r\n\r\n\r\n\r\n

Para facilitar que as informa\u00e7\u00f5es sejam inseridas corretamente, o pessoal do desenvolvimento utiliza quase 100% dos atributos Data Annotation<\/strong> \u2014 que foram introduzidos no .NET 3.5<\/strong> como uma forma de adicionar a valida\u00e7\u00e3o para as classes usadas por aplica\u00e7\u00f5es ASP.NET.<\/strong>\u00a0<\/p>\r\n\r\n\r\n\r\n

Como tudo na vida tende a evoluir, vamos comparar um pouco o Data Annotation<\/strong> com o FluentValidation<\/strong>, nos baseando na sua facilidade de criar c\u00f3digos limpos (clean code<\/em>) mas, principalmente na sua forma de tratamento das valida\u00e7\u00f5es<\/strong>.<\/p>\r\n\r\n\r\n\r\n

Cen\u00e1rio: Vamos imaginar uma view<\/em> com diversos campos e, em um dado momento, o usu\u00e1rio submete para o servidor.<\/p>\r\n\r\n\r\n\r\n

O Data Annotation<\/strong> define os requisitos das propriedades e valida\u00e7\u00e3o das entidades e, caso haja algum erro, retorna o formul\u00e1rio para o usu\u00e1rio.<\/p>\r\n\r\n\r\n\r\n

At\u00e9 ai, beleza. S\u00f3 que, a cada submiss\u00e3o, os erros s\u00e3o tratados um a um.<\/p>\r\n\r\n\r\n\r\n

No FluentValidation<\/strong> isso n\u00e3o funciona, \u00e9 criado um \u201cdicion\u00e1rio de erros<\/em>\u201d, que s\u00f3 ser\u00e1 submetido quando todos erros forem eliminados na view, assim n\u00e3o temos um vai e volta do servidor<\/strong>.<\/p>\r\n\r\n\r\n\r\n

>>Leitura Recomendada:<\/strong>
Usando o <\/em>MediatR <\/em><\/strong><\/a>com ASP.NET Core<\/em><\/p>\r\n\r\n\r\n\r\n

O que \u00e9 Fluent Validation?<\/h2>\r\n\r\n\r\n\r\n\r\n\r\n

Fluent Validation \u00e9 uma biblioteca <\/strong>que veio para criar valida\u00e7\u00f5es de dados<\/strong> de forma simples e r\u00e1pida para os desenvolvedores.<\/p>\r\n\r\n\r\n\r\n

Com ela, podemos usar express\u00f5es Lambda<\/strong> para \u201cconstruir regras de valida\u00e7\u00f5es<\/em>\u201d com retorno de mensagem de erro para cada propriedade das entidades.<\/p>\r\n\r\n\r\n\r\n

Podemos criar projetos de teste (tenho no meu GitHub<\/strong><\/a> um exemplo) em que os retornos s\u00e3o leg\u00edveis.<\/p>\r\n\r\n\r\n\r\n

Quando um projeto \u00e9 100% criado em Fluent Validation<\/strong>, o pessoal de teste tem muito menos afazeres pois o teste ocorre paralelamente ao desenvolvimento.<\/p>\r\n\r\n\r\n\r\n

>>Leitura Recomendada:<\/strong>
Os 5 <\/em>melhores frameworks de Python<\/em><\/strong><\/a><\/p>\r\n\r\n\r\n\r\n

Instalando Fluent Validation no ASP.NET CORE<\/h2>\r\n\r\n\r\n\r\n\r\n\r\n

Para habilitar a integra\u00e7\u00e3o MVC<\/strong>, voc\u00ea precisar\u00e1 adicionar uma refer\u00eancia ao:<\/p>\r\n\r\n\r\n\r\n

 FluentValidation.AspNetCoreassembly <\/pre>\r\n\r\n\r\n\r\n
Instalando o pacote NuGet<\/strong> apropriado<\/p>\r\n\r\n\r\n\r\n
 Install-Package FluentValidation.AspNetCore <\/pre>\r\n\r\n\r\n\r\n
Depois de instalado, voc\u00ea precisar\u00e1 configurar o Fluent Validation <\/strong>na classe Startup <\/em>do seu aplicativo chamando o AddFluentValidation<\/strong>, m\u00e9todo de extens\u00e3o dentro do ConfigureServices<\/strong>, m\u00e9todo que requer a using FluentValidation.AspNetCore<\/strong>.<\/p>\r\n\r\n\r\n\r\n
Este m\u00e9todo deve ser chamado diretamente ap\u00f3s a chamada AddMvc:<\/p>\r\n\r\n\r\n\r\n
 public void ConfigureServices(IServiceCollection services) {\r\n\u00a0\u00a0\u00a0\u00a0services.AddMvc(setup => {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/...mvc setup...\r\n\u00a0\u00a0\u00a0\u00a0}).AddFluentValidation();\r\n}\r\n\r\n <\/pre>\r\n\r\n\r\n\r\n
Para que o ASP.NET descubra seus validadores, eles devem estar registrados na cole\u00e7\u00e3o de servi\u00e7os.<\/p>\r\n\r\n\r\n\r\n
Voc\u00ea pode fazer isso chamando o AddTransient, <\/strong>m\u00e9todo para cada um dos seus validadores…<\/p>\r\n\r\n\r\n\r\n
 public void ConfigureServices(IServiceCollection services) {\r\n\u00a0\u00a0\u00a0\u00a0services.AddMvc(setup => {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/...mvc setup...\r\n\u00a0\u00a0\u00a0\u00a0}).AddFluentValidation();\r\n}\r\n\r\n <\/pre>\r\n\r\n\r\n\r\n
… Ou usando o AddFromAssemblyContaining<\/strong>, m\u00e9todo para registrar automaticamente todos os validadores em uma montagem espec\u00edfica.<\/p>\r\n\r\n\r\n\r\n
Isso encontrar\u00e1 automaticamente quaisquer tipos p\u00fablicos n\u00e3o abstratos <\/em>que herdam AbstractValidatore<\/strong> e est\u00e3o registrados no cont\u00eainer (os gen\u00e9ricos abertos n\u00e3o s\u00e3o suportados).<\/p>\r\n\r\n\r\n\r\n
 services.AddMvc()\r\n\u00a0\u00a0.AddFluentValidation(fv => fv.RegisterValidatorsFromAssemblyContaining<PersonValidator>()); <\/pre>\r\n\r\n\r\n\r\n
Este exemplo sup\u00f5e que o PersonValidato<\/strong>r esteja definido para validar uma classe chamada Person<\/strong>:<\/p>\r\n\r\n\r\n\r\n
 public class Person {\r\n public int Id { get; set; }\r\n public string Name { get; set; }\r\n public string Email { get; set; }\r\n public int Age { get; set; }\r\n}\r\n\r\npublic class PersonValidator : AbstractValidator<Person> {\r\n public PersonValidator() {\r\n RuleFor(x => x.Id).NotNull();\r\n RuleFor(x => x.Name).Length(0, 10);\r\n RuleFor(x => x.Email).EmailAddress();\r\n RuleFor(x => x.Age).InclusiveBetween(18, 60);\r\n }\r\n}\r\n\r\n <\/pre>\r\n\r\n\r\n\r\n
E aqui est\u00e1 a visualiza\u00e7\u00e3o (view<\/em>) correspondente (usando o Razor<\/em>):<\/p>\r\n\r\n\r\n\r\n
 @model Person\r\n\r\n<div asp-validation-summary=\"ModelOnly\"><\/div>\r\n\r\n<form asp-action=\"Create\">\r\n\u00a0\u00a0Id: <input asp-for=\"Id\" \/> <span asp-validation-for=\"Id\"><\/span>\r\n\u00a0\u00a0<br \/>\r\n\u00a0\u00a0Name: <input asp-for=\"Name\" \/> <span asp-validation-for=\"Name\"><\/span>\r\n\u00a0\u00a0<br \/>\r\n\u00a0\u00a0Email: <input asp-for=\"Email\" \/> <span asp-validation-for=\"Email\"><\/span>\r\n\u00a0\u00a0<br \/>\r\n\u00a0\u00a0Age: <input asp-for=\"Age\" \/> <span asp-validation-for=\"Age\"><\/span>\r\n\r\n\u00a0\u00a0<br \/><br \/>\r\n\u00a0\u00a0<input type=\"submit\" value=\"submtit\" \/>\r\n<\/form>\r\n\r\n <\/pre>\r\n\r\n\r\n\r\n
>>Leitura Recomendada:<\/strong>
Melhores <\/em>linguagens de programa\u00e7\u00e3o para devs iniciantes<\/em><\/strong><\/a><\/p>\r\n\r\n\r\n\r\n
Compatibilidade com a valida\u00e7\u00e3o interna do ASP.NET<\/h2>\r\n\r\n\r\n\r\n\r\n\r\n
Por padr\u00e3o, ap\u00f3s a execu\u00e7\u00e3o do Fluent Validation<\/strong>, qualquer outro provedor de validador tamb\u00e9m ter\u00e1 a chance de executar.<\/p>\r\n\r\n\r\n\r\n
Isso significa que voc\u00ea pode misturar Fluent Validation<\/strong> com atributos Data Annotations<\/strong> (ou qualquer outra implementa\u00e7\u00e3o do ASP.NET ModelValidatorProvider<\/strong>).<\/p>\r\n\r\n\r\n\r\n
Se voc\u00ea deseja desativar esse comportamento para que Fluent Validation<\/strong> seja a \u00fanica biblioteca de valida\u00e7\u00e3o executada, defina o RunDefaultMvcValidationAfterFluentValidationExecutes<\/strong> como false na rotina de inicializa\u00e7\u00e3o do aplicativo:<\/p>\r\n\r\n\r\n\r\n
 services.AddMvc().AddFluentValidation(fv => {\r\n\u00a0fv.RunDefaultMvcValidationAfterFluentValidationExecutes = false;\r\n});\r\n\r\n<\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
Valida\u00e7\u00e3o de propriedade filho impl\u00edcita vs expl\u00edcita<\/h3>\r\n\r\n\r\n\r\n
Ao validar gr\u00e1ficos de objetos complexos<\/strong>, por padr\u00e3o, voc\u00ea deve especificar explicitamente quaisquer validadores filhos para propriedades complexas usando SetValidato<\/strong> (consulte a se\u00e7\u00e3o de valida\u00e7\u00e3o de propriedades complexas no Fluent Validation<\/strong><\/a>)<\/p>\r\n\r\n\r\n\r\n
Ao executar um aplicativo ASP.NET MVC<\/strong>, voc\u00ea tamb\u00e9m pode habilitar a valida\u00e7\u00e3o impl\u00edcita para propriedades filho.<\/p>\r\n\r\n\r\n\r\n
Quando isso estiver ativado, em vez de precisar especificar validadores filhos usando SetValidator<\/strong>, a infraestrutura de valida\u00e7\u00e3o do MVC<\/strong> tentar\u00e1 recursivamente encontrar validadores para cada propriedade.<\/p>\r\n\r\n\r\n\r\n
Isso pode ser feito configurando ImplicitlyValidateChildProperties<\/strong> como true<\/strong>.<\/p>\r\n\r\n\r\n\r\n
Observe que, se voc\u00ea habilitar esse comportamento, n\u00e3o dever\u00e1 usar SetValidator<\/strong> para propriedades filho, ou o validador ser\u00e1 executado duas vezes.<\/p>\r\n\r\n\r\n\r\n
Por hoje foi isso, pessoal, espero que tenham gostado do conte\u00fado sobre Fluent Validation<\/strong>, qualquer d\u00favida me procurem nas redes sociais ou nos coment\u00e1rios do blog!<\/p>\r\n\r\n\r\n\r\n
>>Leitura Recomendada:<\/strong>
Dicas de <\/em>Carreira para Programadores .NET<\/em><\/strong><\/a><\/p>\r\n","protected":false},"excerpt":{"rendered":"
Usando o paradigma da orienta\u00e7\u00e3o a objetos, deveria ser natural iniciar o desenvolvimento pelo modelo de entidades, onde as classes s\u00e3o definidas para representar o dom\u00ednio do neg\u00f3cio. Posteriormente, e a partir destas classes, seria gerado o banco de dados usado pela aplica\u00e7\u00e3o para realizar a persist\u00eancia das informa\u00e7\u00f5es. A realidade n\u00e3o \u00e9 bem assim. 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