[Rails] Re: What is the equivalent for write_attribute for associations in Rails?

[egervari]

I found one way to achieve this, but I'm disturbed by it:

  alias_method :old_parent=, :parent=

  def parent=(value)
    self.old_parent = value

    if value.subject.start_with?('Re:')
      self.subject = "#{value.subject}"
    else
      self.subject = "Re: #{value.subject}"
    end

    self.receivers << value.sender
  end

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