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database.ymlを編集する事で変えられるもの

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Q.
database.ymlを編集する事で何が変わるのか?

A.
運用環境を変えられる。database.ymlで表記されている単語は下記の意味である。
development:開発
test:テスト
production:本番

Q.
そもそもなぜ変える必要があるのか?

A.
開発環境では、バグを見つけやすくするツールを導入するために必要
本番環境ではバグを見つけやすくするツールが導入されていると余計な処理が増え、処理に時間がかかる事を防ぐため

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