ActiveRecord.find(array_of_ids), preserving order

by

Oddly, no one has suggested something like this:

index = Something.find(array_of_ids).group_by(&:id)
array_of_ids.map { |i| index[i].first }

As efficient as it gets besides letting SQL backend do it.

Edit: To improve on my own answer, you can also do it like this:

Something.find(array_of_ids).index_by(&:id).slice(*array_of_ids).values

#index_by and #slice are pretty handy additions in ActiveSupport for arrays and hashes respectively.

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