save_revalidly.rb

class SaveRevalidly
  Result = Struct.new(:saved, :errors, keyword_init: true)
  def call(model)
    if model.save
      Result.new(saved: true, errors: model.errors.messages)
    else
      original_errors = model.errors.messages.dup
      if model.invalid? && model.errors.keys.present?
        model.restore_attributes(model.errors.keys)
        subsequently_succeeded = model.save
        Result.new(
          saved: subsequently_succeeded,
          errors: original_errors.merge(model.errors.messages)
        )
      else
        Result.new(saved: false, errors: original_errors)
      end
    end
  end
end

Leaving this for context :)

Is there a standard pattern in Rails to unset/reset a model's attributes to previous values or defaults when the user provides something invalid? (In this case I don't want to issue a validation error and ask the user to fix it, I just want to reset to a sensible default)

https://twitter.com/searls/status/1214369338154635265