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Rails】フォームタグをform_forでやるときのセレクトボックスの作り方 ｜ プログラミングスクールおすすめ10社比較！最短で上達するなら？
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GitHub - onomojo/i18n_country_select: A Rails select form helper using country codes for I18n translations
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Rails】完全理解 formでセレクトボックスをつくるselectの使い方 – なえのメモ帳
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Integrating a Dropdown Element into a Rails Form - YouTube
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