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Sortable Arrays Of Symbols In Ruby

I got this error in my Rails app because I was trying to sort an array of symbols:  undefined method `<=>' for :my_symbol:Symbol.  I defined the spaceship method for the Symbol class and included the Comparable module in order to have other comparison methods available for symbols.

class Symbol
  include Comparable

  def <=>(other)
    self.to_s <=> other.to_s

This lets me do things like the following:

irb(main):007:0> [:c, :a, :d, :b, :e].sort
=> [:a, :b, :c, :d, :e]
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