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こんなのどうやるんだけ
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| FooModel.pluck(:hoge_id, :id) | |
| # => [[1, 1], [1, 2], [2, 3], [3, 4], [3, 5]] | |
| # ↑これを↓こんな風にhoge_id毎にまとめたい | |
| # => {1 => [1, 2], 2 => [3], 3 => [4, 5]} |
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FooModel.pluck(:hoge_id, :id).inject({}){|ret, e| (ret[e[0]] ||= []) << e[1]; ret}