5 files changed, 7 insertions, 9 deletions
diff --git a/railties/lib/rails/generators/actions.rb b/railties/lib/rails/generators/actions.rb
index ffdb314612..5373121835 100644
--- a/railties/lib/rails/generators/actions.rb
+++ b/railties/lib/rails/generators/actions.rb
@@ -189,7 +189,7 @@ module Rails
       #   generate(:authenticated, "user session")
       def generate(what, *args)
         log :generate, what
-        argument = args.flat_map {|arg| arg.to_s }.join(" ")
+        argument = args.flat_map(&:to_s).join(" ")
 
         in_root { run_ruby_script("bin/rails generate #{what} #{argument}", verbose: false) }
       end
diff --git a/railties/lib/rails/generators/base.rb b/railties/lib/rails/generators/base.rb
index 9af6435f23..813b8b629e 100644
--- a/railties/lib/rails/generators/base.rb
+++ b/railties/lib/rails/generators/base.rb
@@ -273,7 +273,7 @@ module Rails
 
         # Use Rails default banner.
         def self.banner
-          "rails generate #{namespace.sub(/^rails:/,'')} #{self.arguments.map{ |a| a.usage }.join(' ')} [options]".gsub(/\s+/, ' ')
+          "rails generate #{namespace.sub(/^rails:/,'')} #{self.arguments.map(&:usage).join(' ')} [options]".gsub(/\s+/, ' ')
         end
 
         # Sets the base_name taking into account the current class namespace.
diff --git a/railties/lib/rails/generators/named_base.rb b/railties/lib/rails/generators/named_base.rb
index b7da44ca2d..397e1e73f1 100644
--- a/railties/lib/rails/generators/named_base.rb
+++ b/railties/lib/rails/generators/named_base.rb
@@ -99,7 +99,7 @@ module Rails
         end
 
         def class_name
-          (class_path + [file_name]).map!{ |m| m.camelize }.join('::')
+          (class_path + [file_name]).map!(&:camelize).join('::')
         end
 
         def human_name
@@ -156,7 +156,7 @@ module Rails
 
         def assign_names!(name) #:nodoc:
           @class_path = name.include?('/') ? name.split('/') : name.split('::')
-          @class_path.map! { |m| m.underscore }
+          @class_path.map!(&:underscore)
           @file_name = @class_path.pop
         end
 
diff --git a/railties/lib/rails/generators/rails/app/app_generator.rb b/railties/lib/rails/generators/rails/app/app_generator.rb
index 9110c129d1..f8a8ae90d9 100644
--- a/railties/lib/rails/generators/rails/app/app_generator.rb
+++ b/railties/lib/rails/generators/rails/app/app_generator.rb
@@ -260,9 +260,7 @@ module Rails
       public_task :generate_spring_binstubs
 
       def run_after_bundle_callbacks
-        @after_bundle_callbacks.each do |callback|
-          callback.call
-        end
+        @after_bundle_callbacks.each(&:call)
       end
 
     protected
diff --git a/railties/lib/rails/generators/resource_helpers.rb b/railties/lib/rails/generators/resource_helpers.rb
index 4669935156..3f84d76ae0 100644
--- a/railties/lib/rails/generators/resource_helpers.rb
+++ b/railties/lib/rails/generators/resource_helpers.rb
@@ -39,7 +39,7 @@ module Rails
         def assign_controller_names!(name)
           @controller_name = name
           @controller_class_path = name.include?('/') ? name.split('/') : name.split('::')
-          @controller_class_path.map! { |m| m.underscore }
+          @controller_class_path.map!(&:underscore)
           @controller_file_name = @controller_class_path.pop
         end
 
@@ -48,7 +48,7 @@ module Rails
         end
 
         def controller_class_name
-          (controller_class_path + [controller_file_name]).map!{ |m| m.camelize }.join('::')
+          (controller_class_path + [controller_file_name]).map!(&:camelize).join('::')
         end
 
         def controller_i18n_scope