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並前往https://www.ruby-forum.com/t/convert-find-all-to-hash-with-id-as-key/131771

Convert find(:all) to hash with id as key - Rails

a = Food.find(:all, :select => “id, content”) result = Hash[*a.map {|e| e.attributes.values}.flatten]. is much slower than: a = Food.find ...

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