Add option to skip Action Cable

railties/lib/rails/generators/app_base.rb

@@ -51,6 +51,9 @@ module Rails
         class_option :skip_spring,        type: :boolean, default: false,
                                           desc: "Don't install Spring application preloader"
 
+        class_option :skip_action_cable,  type: :boolean, aliases: '-C', default: false,
+                                          desc: 'Skip Action Cable files'
+
         class_option :database,           type: :string, aliases: '-d', default: 'sqlite3',
                                           desc: "Preconfigure for selected database (options: #{DATABASES.join('/')})"
 
@@ -168,7 +171,7 @@ module Rails
       end
 
       def include_all_railties?
-        options.values_at(:skip_active_record, :skip_action_mailer, :skip_test, :skip_sprockets).none?
+        options.values_at(:skip_active_record, :skip_action_mailer, :skip_test, :skip_sprockets, :skip_action_cable).none?
       end
 
       def comment_if(value)

railties/lib/rails/generators/rails/app/templates/config/application.rb

@@ -11,7 +11,7 @@ require "active_job/railtie"
 require "action_controller/railtie"
 <%= comment_if :skip_action_mailer %>require "action_mailer/railtie"
 require "action_view/railtie"
-require "action_cable/engine"
+<%= comment_if :skip_action_cable %>require "action_cable/engine"
 <%= comment_if :skip_sprockets %>require "sprockets/railtie"
 <%= comment_if :skip_test %>require "rails/test_unit/railtie"
 <% end  -%>

railties/test/generators/app_generator_test.rb

@@ -375,6 +375,11 @@ class AppGeneratorTest < Rails::Generators::TestCase
     end
   end
 
+  def test_generator_if_skip_action_cable_is_given
+    run_generator [destination_root, "--skip-action-cable"]
+    assert_file "config/application.rb", /#\s+require\s+["']action_cable\/engine["']/
+  end
+
   def test_inclusion_of_javascript_runtime
     run_generator
     if defined?(JRUBY_VERSION)