【Ruby初学者向け講習】Slow Blog のパフォーマンス改善 #1
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## なぜ必要なのか？ has_many の関連付けの場合、preload で関連付けのデータを取得することで、関連元のデータを繰り返し取得しなくてすむため ## 参考 - https://tech.smarthr.jp/entry/2021/11/11/151444
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## なぜ必要なのか？ _post.html.erb の post.tags.each の箇所で post ごとに tags のクエリが呼び出され、N+1となっているため
`preload` で `comments` をロード済みであるため、`count` でクエリを発行せずとも、`size` で件数を確認できるため 参考: https://tech.smarthr.jp/entry/2021/11/11/151444
件数を数えるためのクエリを発行しないようにしました
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