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Modify attribute on set

In this example, we want to allow users to enter a twitter handle with or without an at-sign ('@'), just like Twitter, but save it without the at-sign. twitter_handle is already an attribute on the class.

class User < ActiveRecord::Base
  def twitter_handle=(handle)
    write_attribute(:twitter_handle, handle.to_s.gsub(/^@/, ''))
  end
end
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