##options_for_select ヘルパーで規定値(selectedの値)を設定したい時は次のようにする
# 女性をデフォルトにする場合
options_select_for({"male" => 1, "female" => 2}, 2)
# hashで明示的にする場合は
options_select_for({"male" => 1, "female" => 2}, :selected => 2)
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