Rails - Validation :if one condition is true

Описание: ruby-on-rails: Rails - Validation :if one condition is true

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Just wanted to thank those users featured in this video:
Kathan (https://stackoverflow.com/users/45929...
Malav Bhavsar (https://stackoverflow.com/users/98200...)
Alexander Kuznetsov (https://stackoverflow.com/users/63765...)
Murat (https://stackoverflow.com/users/19706...)

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Related to: ruby-on-rails, validation, ruby-on-rails-4, ruby-on-rails-5