app_base.rb in railties-4.1.16.rc1

- old
+ new

@@ -110,10 +110,11 @@
           assets_gemfile_entry,
           javascript_gemfile_entry,
           jbuilder_gemfile_entry,
           sdoc_gemfile_entry,
           spring_gemfile_entry,
+          mime_type_gemfile_entry,
           @extra_entries].flatten.find_all(&@gem_filter)
       end
 
       def add_gem_entry_filter
         @gem_filter = lambda { |next_filter, entry|
@@ -306,9 +307,15 @@
 
       def spring_gemfile_entry
         return [] unless spring_install?
         comment = 'Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring'
         GemfileEntry.new('spring', nil, comment, group: :development)
+      end
+
+      def mime_type_gemfile_entry
+        return [] unless RUBY_VERSION < '2'
+
+        GemfileEntry.new('mime-types', '< 3', nil, require: false)
       end
 
       def bundle_command(command)
         say_status :run, "bundle #{command}"
 