1 files changed, 3 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/cache/file_store.rb b/activesupport/lib/active_support/cache/file_store.rb
index 18182bbb40..bdef47a237 100644
--- a/activesupport/lib/active_support/cache/file_store.rb
+++ b/activesupport/lib/active_support/cache/file_store.rb
@@ -1,5 +1,6 @@
 require 'active_support/core_ext/file/atomic'
 require 'active_support/core_ext/string/conversions'
+require 'active_support/core_ext/object/inclusion'
 require 'rack/utils'
 
 module ActiveSupport
@@ -20,7 +21,7 @@ module ActiveSupport
       end
 
       def clear(options = nil)
-        root_dirs = Dir.entries(cache_path).reject{|f| ['.', '..'].include?(f)}
+        root_dirs = Dir.entries(cache_path).reject{|f| f.among?('.', '..')}
         FileUtils.rm_r(root_dirs.collect{|f| File.join(cache_path, f)})
       end
 
@@ -161,7 +162,7 @@ module ActiveSupport
         # Delete empty directories in the cache.
         def delete_empty_directories(dir)
           return if dir == cache_path
-          if Dir.entries(dir).reject{|f| ['.', '..'].include?(f)}.empty?
+          if Dir.entries(dir).reject{|f| f.among?('.', '..')}.empty?
             File.delete(dir) rescue nil
             delete_empty_directories(File.dirname(dir))
           end