Rails 5.1 Deprecation Warning- Update board.rb replacing deprecated methods attr_changed? and attr_was #372
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Update board.rb replacing deprecated methods of attr_changed? and attr_was with saved_change_to_attr and attr_before_last_save
See: https://www.fastruby.io/blog/rails/upgrades/active-record-5-1-api-changes.html https://docspring.com/blog/posts/rails-5-1-active-model-dirty-changes/