lib/gem_config/rules.rb in gem_config-0.2.3 vs lib/gem_config/rules.rb in gem_config-0.2.4

@@ -1,7 +1,5 @@
-require 'active_support/core_ext/hash/keys'
-
 module GemConfig
   class Rules < Hash
     InvalidKeyError = Class.new(StandardError)
 
     def has(key, attrs = {})
@@ -22,10 +20,13 @@
     end
 
     private
 
     def check_attributes(attrs)
-      attrs.assert_valid_keys :classes, :values, :default
+      allowed_keys = [:classes, :values, :default]
+      attrs.keys.each do |k|
+        raise ArgumentError, %("#{k}" is not a valid attribute. Valid attributes are: #{allowed_keys.join(', ')}) unless allowed_keys.include?(k)
+      end
 
       if attrs.has_key?(:classes)
         other_than_class = Array(attrs[:classes]).any? do |value|
           !value.is_a?(Class)
         end