Overriding an ActiveRecord attribute

I have a model with a completed:boolean column that I'd like override so I can add some conditional code.

I've never override an A开发者_开发问答ctiveRecord attribute before and wanted to know if the method below is good practice?

class Article < ActiveRecord::Base
  def completed=(b)
    write_attribute(:completed, b)
    # IF b is true then do something
  end
end

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Your approach is fine. The method you've suggested is the one described in the ActiveRecord documentation (scroll down to the heading Overwriting default accessors)

One thing I would add however, is that depending on the specifics of your circumstances you may be able to achieve what you're after using a before_save callback as an alternative.