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-rw-r--r--activesupport/lib/active_support/core_ext/hash/slice.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/slice.rb b/activesupport/lib/active_support/core_ext/hash/slice.rb
index be4dec6e53..3f14470f36 100644
--- a/activesupport/lib/active_support/core_ext/hash/slice.rb
+++ b/activesupport/lib/active_support/core_ext/hash/slice.rb
@@ -9,6 +9,11 @@ module ActiveSupport #:nodoc:
# end
#
# search(options.slice(:mass, :velocity, :time))
+ #
+ # If you have an array of keys you want to limit to, you should splat them:
+ #
+ # valid_keys = [:mass, :velocity, :time]
+ # search(options.slice(*valid_keys))
module Slice
# Returns a new hash with only the given keys.
def slice(*keys)