module FatalError class InvalidArgument < Base end end class Device VALID_STATUSES = { :deleted => 0, :activated => 1, } def status=(new_status) if new_status.is_a?(String) super VALID_STATUSES[new_status.underscore.to_sym] elsif new_status.is_a?(Symbol) super VALID_STATUSES[new_status] else # 想定外の値が指定されたので例外にする raise FatalError::InvalidArgument end end end 「elsif句を使った場合とか、case文では必ずelse句をつけなさいという先
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