回答編集履歴
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accessorsを定義しなくても、デフォルトでaccessorsが生成される。
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ActiveRecodが提供する`accessors`では`super`に対して処理をしているのに対して、[Rubyが提供する`accessors`](https://docs.ruby-lang.org/ja/latest/method/Module/i/attr_accessor.html)では、自クラスに対してなので、ActiveRecordとしては処理されなかったのですね。
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> This would also define the following accessors: Product#name and Product#name=(new_name).
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引用：https://api.rubyonrails.org/files/activerecord/README_rdoc.html
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> 引用：https://api.rubyonrails.org/files/activerecord/README_rdoc.html
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> All column values are automatically available through basic accessors on the Active Record object, but sometimes you want to specialize this behavior. This can be done by overwriting the default accessors (using the same name as the attribute) and calling super to actually change things.
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```ruby
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> ```ruby
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class Song < ActiveRecord::Base
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> class Song < ActiveRecord::Base
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# Uses an integer of seconds to hold the length of the song
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> # Uses an integer of seconds to hold the length of the song
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>
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> def length=(minutes)
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> super(minutes.to_i * 60)
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> end
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>
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> def length
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> super / 60
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> end
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> end
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> ```
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> 引用：[Overwriting default accessors](https://api.rubyonrails.org/classes/ActiveRecord/Base.html#:~:text=Overwriting%20default%20accessors)
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def length=(minutes)
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super(minutes.to_i * 60)
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end
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def length
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super / 60
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end
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end
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```
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引用：[Overwriting default accessors](https://api.rubyonrails.org/classes/ActiveRecord/Base.html#:~:text=Overwriting%20default%20accessors)
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