{"id":39582,"date":"2025-06-17T10:18:46","date_gmt":"2025-06-17T10:18:46","guid":{"rendered":"https:\/\/www.railscarma.com\/?p=39582"},"modified":"2025-06-17T10:26:50","modified_gmt":"2025-06-17T10:26:50","slug":"ruby-include-vs-extend-understanding-the-key-differences","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/ruby-include-vs-extend-understanding-the-key-differences\/","title":{"rendered":"Ruby Include vs Extend: Understanding the Key Differences"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"39582\" class=\"elementor elementor-39582\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b29b611 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b29b611\" 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-0823833\" data-id=\"0823833\" 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-ca020d7 elementor-widget elementor-widget-text-editor\" data-id=\"ca020d7\" 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>In Ruby, a language celebrated for its elegance and flexibility, modules are powerful tools for organizing code and promoting reusability. Modules allow developers to group related methods, constants, and classes, which can then be mixed into other classes or modules to share functionality. Two primary ways to incorporate modules into <a href=\"https:\/\/ruby-doc.com\/docs\/ProgrammingRuby\/html\/classes.html\">classes in Ruby<\/a> are through the <code>\u542b\u3080<\/code> \u305d\u3057\u3066 <code>\u62e1\u5f35<\/code> methods. While both enable code reuse, they serve distinct purposes and behave differently. This article dives deep into the differences between <code>\u542b\u3080<\/code> \u305d\u3057\u3066 <code>\u62e1\u5f35<\/code>, exploring their mechanics, use cases, and best practices, with a focus on <a href=\"https:\/\/www.railscarma.com\/ja\/\">Ruby on Rails\u958b\u767a<\/a> for RailsCarma\u2019s audience.<\/p>\n<h3><strong>What Are Modules in Ruby?<\/strong><\/h3>\n<p>Before delving into <code>\u542b\u3080<\/code> \u305d\u3057\u3066 <code>\u62e1\u5f35<\/code>, let\u2019s briefly recap what modules are in Ruby. A module is a collection of methods, constants, and classes that cannot be instantiated (i.e., you cannot create objects from a module). Modules serve two primary purposes:<\/p>\n<ul>\n<li><strong>Namespaces:<\/strong> Modules help organize code by grouping related functionality, preventing naming collisions. For example, <code>Math<\/code> is a built-in Ruby module containing mathematical methods like <code>Math.sin<\/code>.<\/li>\n<li><strong>Mixins:<\/strong> Modules allow classes to share behavior without relying solely on inheritance. This is where <code>\u542b\u3080<\/code> \u305d\u3057\u3066 <code>\u62e1\u5f35<\/code> \u304c\u767b\u5834\u3059\u308b\u3002.<\/li>\n<\/ul>\n<p>Modules are defined using the <code>module<\/code> keyword:<\/p>\n<pre>ruby\nmodule Greetings\n    def say_hello\n        puts \"Hello!\"\n    end\nend<\/pre>\n<p>Now, let\u2019s explore how <code>\u542b\u3080<\/code> \u305d\u3057\u3066 <code>\u62e1\u5f35<\/code> allow us to use this module in different ways.<\/p>\n<h3><strong>The Ruby Include&nbsp;Method: Mixing in Instance Methods<\/strong><\/h3>\n<p>\u306b\u3064\u3044\u3066 <code>\u542b\u3080<\/code> method is used to mix a module\u2019s methods into a class as <strong>instance methods<\/strong>. When a module is included in a class, its methods become available to instances (objects) of that class.<\/p>\n<h3><strong>\u3069\u306e\u3088\u3046\u306b&nbsp;<\/strong><span style=\"font-size: 25px; font-weight: 700;\">Ruby Include<\/span><strong style=\"font-size: 1.5625rem;\">&nbsp;\u4f5c\u54c1<\/strong><\/h3>\n<p>When you call <code>include ModuleName<\/code> in a class, Ruby inserts the module into the class\u2019s <strong>ancestor chain<\/strong> just above the class itself. This means the module\u2019s methods are available to all instances of the class, and the class can override or extend those methods if needed.<\/p>\n<p>Here\u2019s an example:<\/p>\n<pre>ruby\nmodule Greetings\n    def say_hello\n        puts \"Hello, #{self.name}!\"\n    end\nend\n\nclass User\n    include Greetings\n\n    attr_accessor :name\n\n    def initialize(name)\n        @name = name\n    end\nend\n\nuser = User.new(\"Alice\")\nuser.say_hello # Output: Hello, Alice!<\/pre>\n<p>In this example:<\/p>\n<ul>\n<li>\u306b\u3064\u3044\u3066 <code>Greetings<\/code> module defines the <code>say_hello<\/code> \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3002<\/li>\n<li>\u306b\u3064\u3044\u3066 <code>\u30e6\u30fc\u30b6\u30fc<\/code> class includes <code>Greetings<\/code>, making <code>say_hello<\/code> an instance method of User.<\/li>\n<li>When we create a <code>\u30e6\u30fc\u30b6\u30fc<\/code> instance and call <code>say_hello<\/code>, the method is executed in the context of that instance, with access to instance variables like <code>@name<\/code>.<\/li>\n<\/ul>\n<h3><strong>Checking the Ancestor Chain<\/strong><\/h3>\n<p>To confirm how <code>\u542b\u3080<\/code> affects a class, you can inspect its ancestor chain using the <code>ancestors<\/code> \u65b9\u6cd5\uff1a<\/p>\n<pre>ruby\nputs User.ancestors\n# Output: [User, Greetings, Object, Kernel, BasicObject]<\/pre>\n<p>\u3053\u3053\u3001 <code>Greetings<\/code> is inserted between User and <code>\u5bfe\u8c61<\/code>, indicating that <code>\u30e6\u30fc\u30b6\u30fc<\/code> instances will first look for methods in <code>\u30e6\u30fc\u30b6\u30fc<\/code>, then in <code>Greetings<\/code>, and so on up the chain.<\/p>\n<h3><strong>Use Cases for&nbsp;<\/strong><span style=\"font-size: 25px; font-weight: 700;\">Ruby Include<\/span><\/h3>\n<p>\u306b\u3064\u3044\u3066 <code>\u542b\u3080<\/code> method is ideal when you want to share behavior across instances of a class. Common use cases include:<\/p>\n<ul>\n<li><strong>Sharing Common Instance Behavior:<\/strong> For example, in Rails, the <code>ActiveRecord::Base<\/code> class includes modules like <code>ActiveRecord::Persistence<\/code>, which provides instance methods such as <code>save, update<\/code>\u3001 \u305d\u3057\u3066 <code>\u7834\u58ca\u3059\u308b<\/code> for model instances.<\/li>\n<li><strong>Concerns in Rails:<\/strong> Rails leverages modules heavily through <strong>\u61f8\u5ff5<\/strong>, which are modules included in models or controllers to encapsulate reusable behavior. For instance:<\/li>\n<\/ul>\n<pre>ruby\n# app\/models\/concerns\/auditable.rb\nmodule Auditable\nextend ActiveSupport::Concern\n\nincluded do\nafter_save :log_audit\nend\n\ndef log_audit\nputs \"Record #{self.class.name} was saved.\"\nend\nend\n\n# app\/models\/user.rb\nclass User &lt; ApplicationRecord\ninclude Auditable\nend\n\nuser = User.create(name: \"Bob\")\n# Output: Record User was saved.<\/pre>\n<p>Here, the <code>Auditable<\/code> concern mixes the <code>log_audit<\/code> method into <code>\u30e6\u30fc\u30b6\u30fc<\/code> instances, and the <code>included<\/code> hook sets up an <code>after_save<\/code> callback.<\/p>\n<ul>\n<li><strong>Cross-Cutting Concerns:<\/strong> Modules are perfect for functionality like logging, validation, or serialization that multiple classes need at the instance level.<\/li>\n<\/ul>\n<h3><strong>Limitations of&nbsp;<\/strong><span style=\"font-size: 25px; font-weight: 700;\">Ruby Include<\/span><\/h3>\n<ul>\n<li><strong>Instance Methods Only:<\/strong> <code>\u542b\u3080<\/code> makes module methods available only to instances, not the class itself. For example:<\/li>\n<\/ul>\n<pre>ruby\nUser.say_hello # Raises NoMethodError: undefined method `say_hello' for User:Class<\/pre>\n<ul>\n<li><strong>Method Conflicts:<\/strong> If a class and an included module define methods with the same name, the class\u2019s method takes precedence. This can lead to silent overrides unless carefully managed.<\/li>\n<\/ul>\n<h3><strong>The Extend&nbsp;Method: Adding Class Methods<\/strong><\/h3>\n<p>In contrast to <code>\u542b\u3080<\/code>, the extend method adds a module\u2019s methods to a class as <strong>class methods<\/strong> (i.e., methods called on the class itself, not its instances). This is useful when you want to share behavior at the class level, such as defining class-level utilities or configurations.<\/p>\n<h3><strong>How Extend&nbsp;Works<\/strong><\/h3>\n<p>When you call <code>extend ModuleName<\/code> in a class, Ruby mixes the module\u2019s methods into the class\u2019s singleton class (or metaclass), making them available as class methods. The module\u2019s methods are not available to instances of the class.<\/p>\n<p>Here\u2019s an example:<\/p>\n<pre>ruby\nmodule Utilities\ndef generate_report\nputs \"Generating report for #{self.name}...\"\nend\nend\n\nclass Report\nextend Utilities\nend\n\nReport.generate_report # Output: Generating report for Report...<\/pre>\n<p>In this example:<\/p>\n<ul>\n<li>\u306b\u3064\u3044\u3066 <code>Utilities<\/code> module defines <code>generate_report<\/code> \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3002<\/li>\n<li>\u306b\u3064\u3044\u3066 <code>Report<\/code> class extends <code>Utilities<\/code>, making <code>generate_report<\/code> a class method of <code>Report<\/code>.<\/li>\n<li>We call <code>Report.generate_report<\/code> directly on the class, and <code>self<\/code> refers to <code>Report<\/code>.<\/li>\n<\/ul>\n<h3><strong>Checking the Singleton Class<\/strong><\/h3>\n<p>To see how <code>\u62e1\u5f35<\/code> affects a class, you can inspect the singleton class\u2019s methods like <code>singleton_class.ancestors<\/code>:<\/p>\n<pre>ruby\nputs Report.singleton_class.ancestors\n# Output: [SingletonClass, Utilities, Class, Module, Object, Kernel, BasicObject]<\/pre>\n<p>\u3053\u3053\u3001 <code>Utilities<\/code> is inserted into the singleton class of <code>Report<\/code>, confirming that the module\u2019s methods are class methods.<\/p>\n<h3><strong>Use Cases for Extend<\/strong><\/h3>\n<p>\u306b\u3064\u3044\u3066 <code>\u62e1\u5f35<\/code> method is ideal for defining class-level methods. Common use cases include:<\/p>\n<ul>\n<li><strong>Class-Level Utilities:<\/strong> For example, Rails uses <code>\u62e1\u5f35<\/code> in modules like <code>ActiveRecord::FinderMethods<\/code>, which provides class methods like <code>find_by<\/code> \u307e\u305f\u306f <code>where<\/code> to model classes.<\/li>\n<\/ul>\n<pre>ruby\nExample:\nclass User &lt; ApplicationRecord::Base\n# ActiveRecord::FinderMethods is extended to provide class methods\nend\n\nUser.find_by(name: \"Alice\") # Calls a class method<\/pre>\n<ul>\n<li><strong>Metaprogramming:<\/strong> <code>\u62e1\u5f35<\/code> is often used in metaprogramming to dynamically add class methods to classes. For instance:<\/li>\n<\/ul>\n<pre>ruby\nmodule DynamicScopes\ndef add_scope(name)\ndefine_method(name) do\nputs \"Executing scope: #{name}\"\nend\nend\nend\n\nclass Product\nextend DynamicScopes\nadd_scope(:active)\nend\n\nProduct.active # Output: Executing scope: active<\/pre>\n<ul>\n<li><strong>Configuration Methods:<\/strong> \u306e\u3088\u3046\u306a\u56f3\u66f8\u9928\u304c\u3042\u308b\u3002 <code>\u62e1\u5f35<\/code> often use <code>\u62e1\u5f35<\/code> to provide configuration methods at the class level. For example, the <code>devise<\/code> gem in Rails extends <code>Devise::Models<\/code> into models to add class-level configuration methods like <code>devise :method_authenticatable<\/code>.<\/li>\n<\/ul>\n<h3><strong>Limitations of Extend&nbsp;<\/strong><\/h3>\n<ul>\n<li><strong>Class Methods Only:<\/strong> <code>\u62e1\u5f35<\/code> makes methods available only to the class, not its instances. For example:<\/li>\n<\/ul>\n<pre>ruby\nreport = Report.new\nreport.generate_report # Raises NoMethodError<\/pre>\n<ul>\n<li><strong>Singleton Class Conflicts:<\/strong> If the class already defines a class method with the same name as a module method, the class\u2019s method takes precedence.<\/li>\n<\/ul>\n<h3><strong>Combining Include&nbsp;and Extend<\/strong><\/h3>\n<p>Sometimes, you need a module to provide <strong>both<\/strong> instance and class methods. Rails\u2019 <code>ActiveSupport::Concern<\/code> simplifies this pattern, but you can achieve it manually using the included hook and <code>\u62e1\u5f35<\/code>.<\/p>\n<p>Here\u2019s an example:<\/p>\n<pre>ruby\nmodule Trackable\n    def self.included(base)\n        base.extend ClassMethods\n    end\n\n    def track_event\n        puts \"Tracking event for #{self.class.name}\"\n    end\n\n    module ClassMethods\n        def track_all\n            puts \"Tracking all #{self.name} records\"\n        end\n    end\nend\n\nclass Order\n    include Trackable\nend\n\norder = Order.new\norder.track_event # Output: Tracking event for Order\nOrder.track_all # Output: Tracking all Order records<\/pre>\n<p>In this example:<\/p>\n<ul>\n<li>\u306b\u3064\u3044\u3066 <code>included<\/code> hook extends <code>ClassMethods<\/code> into the base class (<code>Order<\/code>) when <code>Trackable<\/code> is included.<\/li>\n<li><code>tracktrack_event<\/code> becomes an instance method, and <code>track_all<\/code> becomes a class method.<\/li>\n<\/ul>\n<p>In Rails, <code>ActiveSupport::Concern<\/code> abstracts this pattern:<\/p>\n<pre>ruby\nclassmodule Trackable\n    extend ActiveSupport::Concern\n\n    included do\n        class_method :track_all\n    end\n\n    def track_event\n        puts \"Tracking event for #{self.class.name}\"\n    end\n\n    class_method do\n        def track_all\n            puts \"Tracking all #{self.name} records\"\n        end\n    end\nend<\/pre>\n<h3><strong>Include vs. Extend: Key Differences Summarized<\/strong><\/h3>\n<table>\n<tbody>\n<tr>\n<th>Aspect<\/th>\n<td><code>\u542b\u3080<\/code><\/td>\n<td><code>\u62e1\u5f35<\/code><\/td>\n<\/tr>\n<tr>\n<th>\u76ee\u7684<\/th>\n<td>Adds instance methods to a class.<\/td>\n<td>Adds class methods to a class.<\/td>\n<\/tr>\n<tr>\n<th>Target<\/th>\n<td>Instances of the class.<\/td>\n<td>The class itself (singleton class).<\/td>\n<\/tr>\n<tr>\n<th>Ancestor Chain<\/th>\n<td>Module is added to class\u2019s ancestor chain.<\/td>\n<td>Module is added to singleton class\u2019s chain.<\/td>\n<\/tr>\n<tr>\n<th>\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/th>\n<td>Sharing behavior across instances (e.g., Rails concerns).<\/td>\n<td>Defining class utilities (e.g., ActiveRecord finders).<\/td>\n<\/tr>\n<tr>\n<th>\u4f8b<\/th>\n<td><code>user.say_hello<\/code><\/td>\n<td><code>User.find_by_name<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><strong>Best Practices in Rails<\/strong><\/h3>\n<ul>\n<li><strong>\u7528\u9014 <code>\u542b\u3080<\/code> for Instance Behavior:<\/strong> \u7528\u9014 <code>\u542b\u3080<\/code> for methods that operate on instance data, such as model validations or business logic.<\/li>\n<li><strong>\u7528\u9014 <code>\u62e1\u5f35<\/code> for Class Utilities:<\/strong> \u7528\u9014 <code>\u62e1\u5f35<\/code> for methods that define scopes, configurations, or factory methods.<\/li>\n<li><strong>Leverage Concerns:<\/strong> In Rails, use <code>ActiveSupport::Concern<\/code> for reusable modules to keep code DRY and maintainable.<\/li>\n<li><strong>Avoid Overuse:<\/strong> Mixing in too many modules can make code hard to trace. Use modules judiciously and document their purpose.<\/li>\n<li><strong>\u5fb9\u5e95\u7684\u306b\u30c6\u30b9\u30c8\u3059\u308b\uff1a<\/strong> Ensure method name conflicts are resolved and test both instance and class methods when using modules.<\/li>\n<\/ul>\n<h3><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u95a2\u3059\u308b\u8003\u5bdf<\/strong><\/h3>\n<p>Both <code>\u542b\u3080<\/code> \u305d\u3057\u3066 <code>\u62e1\u5f35<\/code> have minimal performance overhead, as Ruby resolves method lookups dynamically. However:<\/p>\n<ul>\n<li><strong>Ancestor Chain Length:<\/strong> Including many modules can slightly slow method resolution due to a longer chain.<\/li>\n<li><strong>Memory Usage:<\/strong> Extending multiple classes with modules increases memory usage for singleton classes, though this is rarely significant in typical Rails apps.<\/li>\n<\/ul>\n<h2><strong>\u7d50\u8ad6<\/strong><\/h2>\n<p>Understanding the difference between <code>\u542b\u3080<\/code> \u305d\u3057\u3066 <code>\u62e1\u5f35<\/code> is essential for writing clean, modular Ruby and Rails code. Use <code>\u542b\u3080<\/code> to share instance methods with objects, enabling reusable behavior across model or controller instances, and <code>\u62e1\u5f35<\/code> to add utility methods to classes, such as scopes or configurations. By mastering these tools and leveraging Rails\u2019 <code>ActiveSupport::Concern<\/code>, developers at <a href=\"https:\/\/www.railscarma.com\/ja\/\">\u30ec\u30fc\u30eb\u30ab\u30fc\u30de<\/a> can build maintainable, scalable applications that fully utilize Ruby\u2019s flexibility.<\/p>\n<p>Whether you\u2019re crafting reusable concerns, implementing domain-specific logic, or optimizing a Rails codebase, knowing when to use <code>\u542b\u3080<\/code> versus <code>\u62e1\u5f35<\/code> empowers you to make informed design decisions. Embrace Ruby\u2019s module system to create elegant, DRY code that stands the test of time.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t  <div class=\"related-post slider\">\r\n        <div class=\"headline\">\u95a2\u9023\u8a18\u4e8b<\/div>\r\n    <div class=\"post-list owl-carousel\">\r\n\r\n            <div class=\"item\">\r\n            <div class=\"thumb post_thumb\">\r\n    <a  title=\"Offliberty Ruby Gem\u3068\u306f\uff1f\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/what-is-offliberty-ruby-gem-and-how-it-works\/?related_post_from=41304\">\r\n\r\n      <img decoding=\"async\" width=\"800\" height=\"300\" src=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/What-is-Offliberty-Ruby-Gem-and-How-It-Works.png\" class=\"attachment-full size-full wp-post-image\" alt=\"\u30aa\u30d5\u30ea\u30d0\u30c6\u30a3\u30fb\u30eb\u30d3\u30fc\u30fb\u30b8\u30a7\u30e0\" 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title=\"Rails\u306elink_to\u30e1\u30bd\u30c3\u30c9\uff1a\u4f8b\u306b\u3088\u308b\u5b8c\u5168\u30ac\u30a4\u30c9\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/rails-link_to-method-the-complete-guide-with-examples\/?related_post_from=41296\">\r\n\r\n      <img decoding=\"async\" width=\"800\" height=\"300\" src=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/Rails-link_to-Method-The-Complete-Guide-with-Examples.png\" class=\"attachment-full size-full wp-post-image\" alt=\"Rails link_to\u30e1\u30bd\u30c3\u30c9\" srcset=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/Rails-link_to-Method-The-Complete-Guide-with-Examples.png 800w, https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/Rails-link_to-Method-The-Complete-Guide-with-Examples-300x113.png 300w, https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/Rails-link_to-Method-The-Complete-Guide-with-Examples-768x288.png 768w, https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/Rails-link_to-Method-The-Complete-Guide-with-Examples-18x7.png 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\r\n\r\n    <\/a>\r\n  <\/div>\r\n\r\n  <a class=\"title post_title\"  title=\"Rails\u306elink_to\u30e1\u30bd\u30c3\u30c9\uff1a\u4f8b\u306b\u3088\u308b\u5b8c\u5168\u30ac\u30a4\u30c9\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/rails-link_to-method-the-complete-guide-with-examples\/?related_post_from=41296\">\r\n        Rails\u306elink_to\u30e1\u30bd\u30c3\u30c9\uff1a\u4f8b\u306b\u3088\u308b\u5b8c\u5168\u30ac\u30a4\u30c9  <\/a>\r\n\r\n        <\/div>\r\n              <div class=\"item\">\r\n            <div class=\"thumb post_thumb\">\r\n    <a  title=\"Ruby on Rails\u3092\u4f7f\u3063\u3066\u30b9\u30b1\u30fc\u30e9\u30d6\u30eb\u306aSaaS\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/how-to-build-a-scalable-saas-platform-using-ruby-on-rails\/?related_post_from=41273\">\r\n\r\n      <img decoding=\"async\" width=\"800\" height=\"300\" src=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/Build-a-SaaS-Platform-Using-Ruby-on-Rails.png\" class=\"attachment-full size-full wp-post-image\" alt=\"Ruby on Rails\u3092\u4f7f\u3063\u3066SaaS\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3092\u69cb\u7bc9\u3059\u308b\" srcset=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/Build-a-SaaS-Platform-Using-Ruby-on-Rails.png 800w, https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/Build-a-SaaS-Platform-Using-Ruby-on-Rails-300x113.png 300w, https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/Build-a-SaaS-Platform-Using-Ruby-on-Rails-768x288.png 768w, https:\/\/www.railscarma.com\/wp-content\/uploads\/2026\/04\/Build-a-SaaS-Platform-Using-Ruby-on-Rails-18x7.png 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\r\n\r\n    <\/a>\r\n  <\/div>\r\n\r\n  <a class=\"title post_title\"  title=\"Ruby on Rails\u3092\u4f7f\u3063\u3066\u30b9\u30b1\u30fc\u30e9\u30d6\u30eb\u306aSaaS\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/how-to-build-a-scalable-saas-platform-using-ruby-on-rails\/?related_post_from=41273\">\r\n        Ruby on Rails\u3092\u4f7f\u3063\u3066\u30b9\u30b1\u30fc\u30e9\u30d6\u30eb\u306aSaaS\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5  <\/a>\r\n\r\n        <\/div>\r\n              <div class=\"item\">\r\n            <div class=\"thumb post_thumb\">\r\n    <a  title=\"Ruby\u6b63\u898f\u8868\u73fe\u30de\u30c3\u30c1\u30ac\u30a4\u30c9\uff082026\uff09\u4f8b\u4ed8\u304d\" 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post_title\"  title=\"Ruby\u6b63\u898f\u8868\u73fe\u30de\u30c3\u30c1\u30ac\u30a4\u30c9\uff082026\uff09\u4f8b\u4ed8\u304d\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/ruby-regex-match-guide-with-examples\/?related_post_from=41249\">\r\n        Ruby\u6b63\u898f\u8868\u73fe\u30de\u30c3\u30c1\u30ac\u30a4\u30c9\uff082026\uff09\u4f8b\u4ed8\u304d  <\/a>\r\n\r\n        <\/div>\r\n      \r\n  <\/div>\r\n\r\n  <script>\r\n      <\/script>\r\n  <style>\r\n    .related-post {}\r\n\r\n    .related-post .post-list {\r\n      text-align: left;\r\n          }\r\n\r\n    .related-post .post-list .item {\r\n      margin: 10px;\r\n      padding: 10px;\r\n          }\r\n\r\n    .related-post .headline {\r\n      font-size: 14px !important;\r\n      color: #999999 !important;\r\n          }\r\n\r\n    .related-post .post-list .item .post_thumb {\r\n      max-height: 220px;\r\n      margin: 10px 0px;\r\n      padding: 0px;\r\n      display: block;\r\n          }\r\n\r\n    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Modules allow developers to group related methods, constants, and classes, which can then be mixed into other classes or modules to share functionality. Two primary ways to incorporate modules into classes in Ruby are through the include and extend methods. While both enable code reuse, they serve distinct purposes and behave differently. This article dives deep into the differences between include and extend, exploring their mechanics, use cases, and best practices, with a focus on Ruby on Rails development for RailsCarma\u2019s audience. What Are Modules in Ruby? Before delving into &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/ruby-regex-match-guide-with-examples\/\"> <span class=\"screen-reader-text\">Ruby\u6b63\u898f\u8868\u73fe\u30de\u30c3\u30c1\u30ac\u30a4\u30c9\uff082026\uff09\u4f8b\u4ed8\u304d<\/span> \u3082\u3063\u3068\u8aad\u3080 \"<\/a><\/p>","protected":false},"author":5,"featured_media":39600,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1224],"tags":[],"class_list":["post-39582","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ruby Include vs Extend: Understanding the Key Differences - RailsCarma - Ruby on Rails Development Company specializing in Offshore Development<\/title>\n<meta name=\"description\" content=\"Discover the key differences between Ruby include module and extend. Learn how each affects class behavior and when to use them.\" \/>\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.railscarma.com\/ja\/\u30d6\u30ed\u30b0\/ruby-include-vs-extend-understanding-the-key-differences\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ruby Include vs Extend: Understanding the Key Differences - RailsCarma - Ruby on Rails Development Company specializing in Offshore Development\" \/>\n<meta property=\"og:description\" content=\"Discover the key differences between Ruby include module and extend. Learn how each affects class behavior and when to use them.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.railscarma.com\/ja\/\u30d6\u30ed\u30b0\/ruby-include-vs-extend-understanding-the-key-differences\/\" \/>\n<meta property=\"og:site_name\" content=\"RailsCarma - Ruby on Rails Development Company specializing in Offshore Development\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/RailsCarma\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-17T10:18:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-17T10:26:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2025\/06\/Ruby-include-vs-extend-Understanding-the-Key-Differences.png\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Nikhil\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@railscarma\" \/>\n<meta name=\"twitter:site\" content=\"@railscarma\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nikhil\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"6\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.railscarma.com\/blog\/ruby-include-vs-extend-understanding-the-key-differences\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/ruby-include-vs-extend-understanding-the-key-differences\/\"},\"author\":{\"name\":\"Nikhil\",\"@id\":\"https:\/\/www.railscarma.com\/#\/schema\/person\/1aa0357392b349082303e8222c35c30c\"},\"headline\":\"Ruby Include vs Extend: Understanding the Key Differences\",\"datePublished\":\"2025-06-17T10:18:46+00:00\",\"dateModified\":\"2025-06-17T10:26:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/ruby-include-vs-extend-understanding-the-key-differences\/\"},\"wordCount\":1214,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.railscarma.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/ruby-include-vs-extend-understanding-the-key-differences\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2025\/06\/Ruby-include-vs-extend-Understanding-the-Key-Differences.png\",\"articleSection\":[\"Blogs\"],\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.railscarma.com\/blog\/ruby-include-vs-extend-understanding-the-key-differences\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.railscarma.com\/blog\/ruby-include-vs-extend-understanding-the-key-differences\/\",\"url\":\"https:\/\/www.railscarma.com\/blog\/ruby-include-vs-extend-understanding-the-key-differences\/\",\"name\":\"Ruby Include vs Extend: Understanding the Key Differences - RailsCarma - Ruby on Rails Development Company specializing in Offshore Development\",\"isPartOf\":{\"@id\":\"https:\/\/www.railscarma.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/ruby-include-vs-extend-understanding-the-key-differences\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/ruby-include-vs-extend-understanding-the-key-differences\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2025\/06\/Ruby-include-vs-extend-Understanding-the-Key-Differences.png\",\"datePublished\":\"2025-06-17T10:18:46+00:00\",\"dateModified\":\"2025-06-17T10:26:50+00:00\",\"description\":\"Discover the key differences between Ruby include module and extend. 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