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    David Kimura PRO said over 8 years ago on Importing and Exporting CSV Data :

    The * is a splat operator. So, take the following example.

    [2] pry(main)> fields
    => ["first_name", "last_name"]
    [3] pry(main)> User.first.attributes.values_at(fields)
    User Load (0.5ms)SELECT`users`.* FROM `users` ORDER BY `users`.`id` ASC LIMIT 1
    => [nil]
    [4] pry(main)> User.first.attributes.values_at(*fields)
    User Load (0.5ms)SELECT`users`.* FROM `users` ORDER BY `users`.`id` ASC LIMIT 1
    => ["System", "Administrator"]

    http://blog.honeybadger.io/rub...

    The ! at the end of find_or_create_by will raise an exception on validation errors.

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