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Rails + MySQL – NULLをORDERで最後/最初に並べる例

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# ASCで並び替え NULL は最後に並べる
User.order(Arel.sql('name IS NULL ASC, name ASC'))

# DESCで並び替え NULL は最後に並べる
User.order(Arel.sql('name IS NULL ASC, name DESC'))

# ASCで並び替え NULL は最初に並べる
User.order(Arel.sql('name IS NULL DESC, name ASC'))

# DESC で並び替えNULLは最後に並べる
User.order(Arel.sql('name IS NULL DESC, name DESC'))

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