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Because .update returns the object, rather than a boolean value, which isn't needed here, it might be better to just use .update_attributes.
http://stackoverflow.com/questions/27684038/rails-paperclip-update-vs-update-attributes
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.update_attributes is an alias for .update as of 4.0.2
http://apidock.com/rails/v4.0.2/ActiveRecord/Persistence/update_attributes
And .update does return false, but only if the object is invalid.