{"id":6512,"date":"2015-06-09T07:19:52","date_gmt":"2015-06-09T07:19:52","guid":{"rendered":"https:\/\/dev.railscarma.com\/ruby-module-article\/"},"modified":"2025-12-18T11:24:47","modified_gmt":"2025-12-18T11:24:47","slug":"articolo-sul-modulo-ruby","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/it\/blog\/articoli-tecnici\/articolo-sul-modulo-ruby\/","title":{"rendered":"Le basi della creazione e dell'uso dei moduli Ruby"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"6512\" class=\"elementor elementor-6512\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-54fe0c61 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"54fe0c61\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-44a03edd\" data-id=\"44a03edd\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7ae3bfac elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"7ae3bfac\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><strong>Rubino sui binari<\/strong> \u00e8 un meraviglioso framework open source per applicazioni web full-stack che privilegia le convenzioni rispetto alla configurazione.&nbsp;&nbsp;<\/span><span style=\"font-size: medium;\">Grazie ai componenti riutilizzabili e facilmente configurabili normalmente utilizzati per la creazione di applicazioni, la creazione di applicazioni in Rails \u00e8 pi\u00f9 rapida e semplice, con conseguente miglioramento della produttivit\u00e0 e della crescita aziendale.&nbsp;<\/span><span style=\"font-size: medium;\">Sta guadagnando terreno tra gli sviluppatori poich\u00e9 \u00e8 flessibile, scalabile e facile per gli sviluppatori web scrivere e gestire applicazioni.&nbsp;<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><strong><a href=\"https:\/\/rubyonrails.org\/\">Rubino sui binari<\/a><\/strong> pone l&#039;accento sull&#039;utilizzo di modelli e principi ingegneristici noti al fine di ridurre il carico di lavoro durante la creazione di applicazioni web.&nbsp;<\/span><span style=\"font-size: medium;\">Anche se esistono diversi metodi per risolvere una sfida di programmazione, Ruby afferma di fare affidamento su modelli comunemente utilizzati che rendono i siti Web Rails pi\u00f9 facili da mantenere e aggiornare.&nbsp;<\/span><span style=\"font-size: medium;\">Le librerie open source con blocchi pi\u00f9 piccoli di codice Rails che risolvono problemi particolari vengono comunemente utilizzate per ridurre il sovraccarico di sviluppo.&nbsp;<\/span><span style=\"font-size: medium;\">Con l&#039;aiuto di tali blocchi di codice, gli sviluppatori possono inserire gemme stabili e ben testate invece di perdere tempo a scrivere gli stessi tipi di codici. Uno degli strumenti pi\u00f9 potenti nella cassetta degli attrezzi di un programmatore Ruby \u00e8 il modulo. <b>Rubino&nbsp;<\/b><\/span><span style=\"font-size: medium;\"><b>Moduli<\/b> forniscono una struttura per raccogliere le classi, i metodi e le costanti di Ruby in un'unica unit\u00e0 definita e nominata separatamente.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Ci\u00f2 \u00e8 utile per evitare conflitti con classi, metodi e costanti esistenti e anche per poter aggiungere (mixare) la funzionalit\u00e0 dei moduli nelle tue classi.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><font size=\"3\"><b>Creare un modulo in Ruby<\/b><\/font><\/h2>\n<p style=\"text-align: justify;\"><font size=\"3\">La creazione di un modulo \u00e8 simile alla creazione di una classe, con la differenza che si usa la parola chiave module invece della parola chiave class.<\/font><\/p>\n<pre style=\"text-align: justify;\">modulo MyFirstModule\n  def say_hello\n    mette \"Ciao\"\n  fine\nfine<font size=\"3\"><\/font><\/pre>\n<p style=\"text-align: justify;\"><font size=\"3\">I moduli non possono essere istanziati. Per utilizzare un modulo, \u00e8 necessario includerlo o estenderlo all'interno di una classe.<\/font><\/p>\n<h2 style=\"text-align: justify;\"><font size=\"3\"><b>Utilizzo di include e extend<\/b><\/font><\/h2>\n<p style=\"text-align: justify;\">\n<\/p><ul>\n<li><font size=\"3\"><b>includere<\/b><\/font><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><font size=\"3\">Mescola i metodi del modulo come metodi di istanza della classe.<\/font><\/p>\n<p style=\"text-align: justify;\">\n<\/p><ul>\n<li><font size=\"3\"><b>estendere<\/b><\/font><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><font size=\"3\">Mescola i metodi del modulo come metodi della classe.<\/font><\/p>\n<p style=\"text-align: justify;\"><font size=\"3\"><b>Esempio<\/b><\/font><\/p>\n<pre style=\"text-align: justify;\">modulo Modulo riutilizzabile\n  def modulo_metodo\n    mette \"Metodo del modulo: Ciao!\"\n  end\nfine\n\nclasse ClasseCheInclude\n  include Modulo riutilizzabile\nfine\n\nclasseCheEstende\n  estende ReusableModule\nfine\n\nmette \"Include\"\nClassThatIncludes.new.module_method\n# =&gt; \"Metodo modulo: Ciao!\"\n\nputs \"Estendere\"\nClasseCheEstende.module_method\n# =&gt; \"Metodo modulo: Ciao!\"<\/pre>\n<h2 style=\"text-align: justify;\"><font size=\"3\"><b>Altri concetti importanti sui moduli in Ruby<\/b><\/font><\/h2>\n<p style=\"text-align: justify;\"><font size=\"3\"><b>1. Nozioni di base sulla ricerca dei metodi:<\/b><\/font><\/p>\n<pre style=\"text-align: justify;\">modulo M\n  def rapporto\n    mette \"'report' metodo nel modulo M\"\n  fine\nfine\n\nclasse C\n  include M\nfine\n\nclasse D &lt; C\nfine<br>\n<b><\/b>obj = D.new\nobj.report<\/pre>\n<p style=\"text-align: justify;\"><font size=\"3\"><b>Produzione:<\/b><\/font><\/p>\n<pre style=\"text-align: justify;\"><font size=\"3\">'metodo 'report' nel modulo M<\/font><\/pre>\n<h2 style=\"text-align: justify;\"><font size=\"3\"><b>Come funziona la ricerca del metodo<\/b><\/font><\/h2>\n<p style=\"text-align: justify;\"><font size=\"3\">Quando un oggetto Ruby riceve un messaggio (chiamata di metodo), cerca il metodo in questo ordine:<\/font><\/p>\n<ol>\n<li>La classe degli oggetti (D)<\/li>\n<li><font size=\"3\">Moduli inclusi nella classe (D)<\/font><\/li>\n<li><font size=\"3\">La superclasse (C)<\/font><\/li>\n<li><font size=\"3\">Moduli inclusi nella superclasse (M)<\/font><\/li>\n<li><font size=\"3\">Continuare a risalire la catena ereditaria<\/font><\/li>\n<\/ol>\n<p style=\"text-align: justify;\"><font size=\"3\">In questo caso:<\/font><\/p>\n<p style=\"text-align: justify;\">\n<\/p><ul>\n<li><font size=\"3\">D non definisce il rapporto<\/font><\/li>\n<li><span style=\"font-size: 16px;\">C non definisce il rapporto<\/span><\/li>\n<li><span style=\"font-size: 16px;\">C include il modulo M<\/span><\/li>\n<li><span style=\"font-size: 16px;\">M definisce il report, quindi Ruby lo esegue<\/span><\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\"><font size=\"3\"><b>2. Definizione dello stesso metodo pi\u00f9 volte<\/b><\/font><\/h2>\n<p style=\"text-align: justify;\"><font size=\"3\">Se un metodo \u00e8 definito pi\u00f9 volte, l'ultima definizione ha la precedenza. Questo vale sia per le classi che per i moduli.<\/font><\/p>\n<pre style=\"text-align: justify;\">modulo Interessi\n  def calcola_interesse\n    puts \"Segnaposto! Siamo nel modulo InterestBearing\".\n  fine\nfine\n\nclasse ContoBanca\n  include InteresseCorrelato\n\n  def calcola_interessi\n    puts \"Segnaposto! Siamo nella classe BankAccount\".\n    puts \"E stiamo sovrascrivendo il metodo calcola_interesse!\"\n  fine\nfine\n\nconto = BankAccount.new\nconto.calcola_interesse<\/pre>\n<p style=\"text-align: justify;\"><font size=\"3\">Produzione:<\/font><\/p>\n<pre style=\"text-align: justify;\"><font size=\"3\">Segnaposto! Siamo nella classe BankAccount.<br><\/font><font size=\"3\">E stiamo sovrascrivendo il metodo calculate_interest!<\/font><\/pre>\n<p style=\"text-align: justify;\"><font size=\"3\">Il metodo della classe sovrascrive il metodo del modulo.<\/font><\/p>\n<h2 style=\"text-align: justify;\"><font size=\"3\"><b>3. Mescolare pi\u00f9 moduli Ruby con lo stesso nome di metodo<\/b><\/font><\/h2>\n<pre style=\"text-align: justify;\">modulo M\n  def rapporto\n    mette \"'report' metodo nel modulo M\"\n  fine\nfine\n\nmodulo N\n  def rapporto\n    mette \"'report' metodo nel modulo N\"\n  fine\nfine\n\nclasse C\n  include M\n  includere N\nfine\n\nc = C.new\nc.report<\/pre>\n<p style=\"text-align: justify;\"><font size=\"3\">Produzione:<\/font><\/p>\n<pre style=\"text-align: justify;\"><font size=\"3\">'metodo 'report' nel modulo N<\/font><\/pre>\n<p style=\"text-align: justify;\"><font size=\"3\">L'ultimo modulo incluso vince perch\u00e9 appare per primo nel percorso di ricerca dei metodi.<\/font><\/p>\n<h2 style=\"text-align: justify;\"><font size=\"3\"><b>4. Includere un modulo Ruby pi\u00f9 di una volta<\/b><\/font><\/h2>\n<pre style=\"text-align: justify;\">classe C\n  includere M\n  includere N\n  includere M\nfine\n\nc = C.new\nc.report<\/pre>\n<p style=\"text-align: justify;\"><font size=\"3\">Produzione:<\/font><\/p>\n<pre style=\"text-align: justify;\"><font size=\"3\">'metodo 'report' nel modulo N<\/font><\/pre>\n<p style=\"text-align: justify;\"><font size=\"3\"><b>Spiegazione<\/b><\/font><\/p>\n<p style=\"text-align: justify;\"><font size=\"3\">La reinclusione di un modulo non ha effetto se il modulo \u00e8 gi\u00e0 presente nel percorso di ricerca. Ruby non lo sposta di nuovo in cima. Il nuovo modulo incluso pi\u00f9 di recente (N) ha ancora la precedenza.<\/font><\/p>\n<h2 style=\"text-align: justify;\"><font size=\"3\"><b>5. Usare super con i moduli Ruby<\/b><\/font><\/h2>\n<p style=\"text-align: justify;\"><font size=\"3\">La parola chiave super consente di chiamare il metodo successivo nella catena di ricerca dei metodi.<\/font><\/p>\n<pre style=\"text-align: justify;\">modulo M\n  def rapporto\n    mette \"'report' metodo nel modulo M\"\n  fine\nfine\n\nclasse C\n  include M\n\n  def rapporto\n    puts \"'report' metodo nella classe C\"\n    puts \"In procinto di attivare il prossimo metodo di report di livello superiore...\"\n    super\n    puts \"Ritorno dalla chiamata 'super'\".\n  end\nfine\n\nc = C.new\nc.report<\/pre>\n<p style=\"text-align: justify;\"><font size=\"3\">Produzione:<\/font><\/p>\n<pre style=\"text-align: justify;\">'Metodo 'report' nella classe C\nIn procinto di attivare il metodo di report successivo...\nMetodo 'report' nel modulo M\nDi ritorno dalla chiamata 'super'.<\/pre>\n<p style=\"text-align: justify;\"><font size=\"3\"><b>Cosa succede qui<\/b><\/font><\/p>\n<p style=\"text-align: justify;\">\n<\/p><ul>\n<li><font size=\"3\">Ruby esegue prima il rapporto nella classe C<\/font><\/li>\n<li><span style=\"font-size: 16px;\">super chiama il metodo di report successivo nella catena di ricerca (dal modulo M)<\/span><\/li>\n<li><span style=\"font-size: 16px;\">Il controllo torna quindi al metodo della classe<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><a href=\"https:\/\/www.railscarma.com\/it\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>RailsCarma<\/strong><\/a> ha lavorato su RoR sin dalla sua fase nascente e con una forte forza lavoro addestrata in RoR, \u00e8 cresciuto fino a diventare un nome di grande fiducia nella consulenza end-to-end, architettura, costruzione, gestione ed estensione di Ruby on Rails ad aziende di tutto il mondo.&nbsp;<\/span><\/p>\n<p style=\"text-align: justify;\"><em><b>Per saperne di pi\u00f9 :&nbsp;<\/b><\/em><\/p>\n<ul>\n<li><a href=\"\/it\/blog\/articoli-tecnici\/implementando-tinymce-in-ruby-on-rails\/\" target=\"_blank\" rel=\"noopener noreferrer\">Implementazione di TinyMCE in Ruby on Rails<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"\/it\/blog\/articoli-tecnici\/comprendere-il-plug-in-della-pipeline-delle-risorse\/\" target=\"_blank\" rel=\"noopener noreferrer\">Comprensione del plugin Asset Pipeline<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"\/it\/blog\/articoli-tecnici\/polymorphic-associations-with-active-record\/\" target=\"_blank\" rel=\"noopener noreferrer\">Associazioni polimorfiche con record attivo<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"\/it\/blog\/articoli-tecnici\/a-simple-way-to-increase-the-performance-of-your-rails-app-2\/\" target=\"_blank\" rel=\"noopener noreferrer\">Un modo semplice per aumentare le prestazioni della tua app Rails<\/a><\/li>\n<\/ul>\n<p><a href=\"\/it\/contattaci\/\">Mettiti in contatto con 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\"<\/a><\/p>","protected":false},"author":1,"featured_media":32034,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[385,455,384],"tags":[389,421,636,382,637],"class_list":["post-6512","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-management","category-rails-3","category-technical-articles","tag-rails","tag-ror","tag-ruby-module","tag-ruby-on-rails","tag-ruby-on-rails-development-company"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Basics of Creating and Using Ruby Modules - RailsCarma<\/title>\n<meta name=\"description\" content=\"Learn the basics of creating and using modules in Ruby on Rails to organize code improve reuse and keep applications clean and maintainable.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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