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steveh/on_change.rb

Forked from benschwarz/on_change.rb
Created November 26, 2009 11:58
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on_change.rb
# Use on_change :property { # do stuff here }
# to make changes to models after a property has been changed
module OnChange
def on_change(attribute, &block)
after_save do
block.call if send("#{attribute}_changed?")
end
end
end
ActiveRecord::Base.send(:extend, OnChange)
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