{"id":1275,"date":"2020-02-10T11:03:15","date_gmt":"2020-02-10T09:03:15","guid":{"rendered":"http:\/\/www.lafabriquedecode.com\/blog\/?p=1275"},"modified":"2020-02-10T11:34:36","modified_gmt":"2020-02-10T09:34:36","slug":"ruby-on-rails-le-design-pattern-factory","status":"publish","type":"post","link":"http:\/\/www.lafabriquedecode.com\/blog\/2020\/02\/ruby-on-rails-le-design-pattern-factory\/","title":{"rendered":"Ruby on Rails: design pattern Factory"},"content":{"rendered":"<p>Pour traiter du design pattern <strong>Factory<\/strong> en Ruby (dans le <em>framework<\/em> Rails), j&rsquo;ai repris <a href=\"http:\/\/www.lafabriquedecode.com\/blog\/2013\/04\/le-design-pattern-factory-method-en-php\/\">les exemples faits en PHP<\/a> il y a d\u00e9j\u00e0 7 ans !<\/p>\n<p>Comme les principes ne diff\u00e8rent pas d&rsquo;un langage \u00e0 l&rsquo;autre, seul le code figurera ici. Pour les explications, je vous renvoie au lien ci-dessus !<\/p>\n<pre class=\"brush: ruby; title: ; notranslate\" title=\"\">\r\n# on importe de quoi utiliser constantize\r\nrequire 'active_support\/inflector'\r\n\r\n# l'interface des fabriques (ici une classe abstraite)\r\nclass FabriqueFacture\r\n  def initialize\r\n    raise &quot;Impossible d'instancier la classe abstraite FabriqueFacture&quot;\r\n  end\r\n\r\n  def fabriquer\r\n    raise NotImplementedError\r\n  end\r\nend\r\n\r\n# les fabriques concr\u00e8tes\r\nclass FabriqueEnteteFacture &lt; FabriqueFacture\r\n  CLASSE_CIBLE = 'Entete'\r\n  private_constant :CLASSE_CIBLE\r\n\r\n  def initialize\r\n    # on \u00e9crase le constructeur qui l\u00e8ve une exception dans la classe m\u00e8re\r\n  end\r\n\r\n  def fabriquer\r\n    CLASSE_CIBLE.constantize.new\r\n  end\r\nend\r\n\r\nclass FabriqueCorpsFacture &lt; FabriqueFacture\r\n  CLASSE_CIBLE = 'Corps'\r\n  private_constant :CLASSE_CIBLE\r\n\r\n  def initialize(produits)\r\n    @produits = produits\r\n  end\r\n\r\n  def fabriquer\r\n    CLASSE_CIBLE.constantize.new(@produits)\r\n  end\r\n\r\n  private\r\n\r\n  attr_accessor :produits\r\nend\r\n\r\nclass FabriquePiedPageFacture &lt; FabriqueFacture\r\n  CLASSE_CIBLE = 'PiedPage'\r\n  private_constant :CLASSE_CIBLE\r\n\r\n  def initialize\r\n    # m\u00eame remarque que pour le constructeur de FabriqueEnteteFacture\r\n  end\r\n\r\n  def fabriquer\r\n    CLASSE_CIBLE.constantize.new\r\n  end\r\nend\r\n\r\n#\u00a0les produits CONCRETS\r\nclass PiedPage\r\n  def formater\r\n    &quot;Je formate mon pied de page&quot;\r\n  end\r\nend\r\n\r\nclass Entete\r\n  def formater()\r\n    &quot;Je formate mon ent\u00eate&quot;\r\n  end\r\nend\r\n\r\nclass Corps\r\n  def initialize (produits)\r\n    @produits = produits\r\n  end\r\n\r\n  def formater\r\n    &quot;Je formate mon corps avec mes #{@produits.count} produits&quot;\r\n  end\r\nend\r\n\r\n# le code client pour tester toute la cha\u00eene\r\n\r\nclass Facturation\r\n  def initialize(fabrique_entete, fabrique_corps, fabrique_pied)\r\n    if !((fabrique_entete.is_a? FabriqueFacture) &amp;&amp; \r\n        (fabrique_corps.is_a? FabriqueFacture) &amp;&amp; \r\n        (fabrique_pied.is_a? FabriqueFacture))\r\n      raise &quot;Les fabriques doivent d\u00e9river FabriqueFacture&quot;\r\n    end\r\n    @entete = fabrique_entete.fabriquer\r\n    @corps = fabrique_corps.fabriquer\r\n    @pied = fabrique_pied.fabriquer\r\n  end\r\n\r\n  def declencher\r\n    puts @entete.formater\r\n    puts @corps.formater\r\n    puts @pied.formater\r\n  end\r\n\r\n  private\r\n\r\n  attr_accessor :entete, :corps, :pied\r\nend\r\n\r\nproduits = ['Gourde', 'Ballon', 'Pioche']\r\n\r\nfacturation = Facturation.new(\r\n    FabriqueEnteteFacture.new,\r\n    FabriqueCorpsFacture.new(produits),\r\n    FabriquePiedPageFacture.new\r\n)\r\n\r\nfacturation.declencher\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Pour traiter du design pattern Factory en Ruby (dans le framework Rails), j&rsquo;ai repris les exemples faits en PHP il y a d\u00e9j\u00e0 7 ans ! Comme les principes ne diff\u00e8rent pas d&rsquo;un langage \u00e0 l&rsquo;autre, seul le code figurera ici. Pour les explications, je vous renvoie au lien ci-dessus !<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[24,40,14,95,29],"tags":[43,107,106],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.6.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ruby on Rails: design pattern Factory - La Fabrique de code - Tech 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=\"http:\/\/www.lafabriquedecode.com\/blog\/2020\/02\/ruby-on-rails-le-design-pattern-factory\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ruby on Rails: design pattern Factory - La Fabrique de code - Tech blog\" \/>\n<meta property=\"og:description\" content=\"Pour traiter du design pattern Factory en Ruby (dans le framework Rails), j&rsquo;ai repris les exemples faits en PHP il y a d\u00e9j\u00e0 7 ans ! Comme les principes ne diff\u00e8rent pas d&rsquo;un langage \u00e0 l&rsquo;autre, seul le code figurera ici. 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