Array.to_ordered_hash replacement for Rails 2.3 ActiveSupport::OrderedHash.new

The simple

ActiveSupport::OrderedHash.new [[1,2]]

does no longer work in Rails 2.3, so I built a small patch for array that make OrderedHash creation simple again.

Code

class Array
  def to_ordered_hash
    ActiveSupport::OrderedHash[self]
  end
end

Usage

hash = [[:key, 'value'], [:key2, :value2], [1, 2]].to_ordered_hash
hash == {:key=>'value', :key2=>:value2, :1=>2}

a more complete but longer/harder version

8 thoughts on “Array.to_ordered_hash replacement for Rails 2.3 ActiveSupport::OrderedHash.new”

Tyler Rick says:

2009-10-07 at 7:46:37

Thanks for this tip! I was very confused when I tried to instantiate a new hash with ActiveSupport::OrderedHash.new the same way I had done before only to get back an empty hash! Adding Array#to_ordered_hash makes instantiation so much nicer. I wish they would add that to core Ruby or Rails.

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Sébastien Grosjean - ZenCocoon says:

2010-01-15 at 11:08:00

Nice one, you can simplify your method like :

def to_ordered_hash
returning(ActiveSupport::OrderedHash.new){|map| each {|k,v| map[k] = v } }
end

Hope that helps.

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Sébastien Grosjean - ZenCocoon says:

2010-01-15 at 12:38:00

An other useful tool I’ve just made to I18n-js :
http://seb.box.re/2010/1/15/convert-hash-to-ordered-hash-with-rails-2-3-and-ruby-1-8

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pragmatig says:

2010-01-15 at 12:46:20

First solution it shorter, but imo not simpler.
The second solution looks edge-case-complete afaik.

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- Sébastien Grosjean - ZenCocoon says:
  
  2010-01-15 at 13:27:11
  
  Right, it’s simpler not easier. Anyone shall use the one he prefer 😉 Both makes the job.
  
  Reply
Sébastien Grosjean - ZenCocoon says:

2010-01-15 at 13:28:23

I found your nice post and snippet while working on ordering hash with ruby 1.8 and rails 2.3+.

I’ve came up with the following at : http://seb.box.re/2010/1/15/deep-hash-ordering-with-ruby-1-8

Might be a useful tool

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Brian says:

2010-01-26 at 16:24:37

Instead of
ActiveSupport::OrderedHash.new [[1,2]]
use
ActiveSupport::OrderedHash[1,2]

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pragmatig says:

2010-01-26 at 20:17:09

Thanks for the tip, i added it to the post!

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