Rails' index_by: the easy way to convert an Array to a Hash

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Apr 12 ’12

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Rails’ index_by: the easy way to convert an Array to a Hash

As Aditya Sanghi notes in “Quickly convert an Array to a Hash”, a very quick way to convert an Array to a Hash, is to use Rails’ Enumerable#index_by:

Post.all.index_by { |post| post.id }
# => { 1 => #<Post ...>, 2 => #<Post ...>, ... }

Post.all.index_by(&:title)
# => { "My first post" => #<Post ...>, "My second post" => #<Post ...>, ... }

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