How to rewrite 'column => self[column]' field generic hash rocket to ruby 1.9 hash format

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How can the below (specifically User.exists?(column => self[column])) be re-written in Ruby's 1.9 hash syntax?

 def generate_token(column)
    begin
      self[column] = SecureRandom.urlsafe_base64
    end while User.exists?(column => self[column])
  end

asked 49 secs ago

user1322092

90