A example for generating OrderedHash from Array. Useful for Rails FormHelper, isn't it ?

array_to_orderedhash.rb

#                                                                             
# Convert Array to OrderedHash                                           
#                                                                             
# [param] Array arr                                                           
# [return] OrderedHash                                                        
#                                                                             
def to_oh( arr )
  ActiveSupport::OrderedHash[*arr.zip((0...arr.size).to_a).flatten]
end