Do not respond to suffixes for keys which are not present in mash. Fixes compability with activesupport permit?

1 files changed, 8 insertions, 1 deletions

diff --git a/lib/hashie/mash.rb b/lib/hashie/mash.rb
index 880225e..84830c1 100644
--- a/lib/hashie/mash.rb
+++ b/lib/hashie/mash.rb
@@ -55,6 +55,7 @@ module Hashie
   #   mash.author # => <Mash>
   #
   class Mash < Hash
+    ALLOWED_SUFFIXES = %w(? ! = _)
     include Hashie::PrettyInspect
     alias_method :to_s, :inspect
 
@@ -187,10 +188,16 @@ module Hashie
     # Will return true if the Mash has had a key
     # set in addition to normal respond_to? functionality.
     def respond_to?(method_name, include_private=false)
-      return true if key?(method_name) || method_name.to_s.slice(/[=?!_]\Z/)
+      return true if key?(method_name) || prefix_method?(method_name)
       super
     end
 
+
+    def prefix_method?(method_name)
+      method_name = method_name.to_s
+      method_name.end_with?(*ALLOWED_SUFFIXES) && key?(method_name.chop)
+    end
+
     def method_missing(method_name, *args, &blk)
       return self.[](method_name, &blk) if key?(method_name)
       match = method_name.to_s.match(/(.*?)([?=!_]?)$/)