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Usefull Additions to the Hash Class (See related posts)

Rename keys and return a duplicate hash, or perform the method and modify the current hash.
Check each value in the hash and return true if they are all empty, otherwise return false.

class Hash
  def rename_key(old_key, new_key)
    return Hash.rename_key(self.dup, old_key, new_key)
  end
  
  def rename_key!(old_key, new_key)
    return Hash.rename_key(self, old_key, new_key)
  end
  
  def all_values_empty?
    self.each_value do |v|
      return false if v and v != ""
    end
    
    return true
  end
  
  private
    def self.rename_key(hsh, old_key, new_key)
      hsh[new_key.to_s] = hsh.delete(old_key.to_s)
      return hsh
    end
end
to hash by akbloom on Mon Sep 10 17:01:10 -0400 2007

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