index_by (Enumerable) - APIdock

Instance methods (17) as_json compact_blank (>= v6.1.3.1) each_with_object (<= v3.2.13) exclude? excluding (>= v6.0.0) group_by (<= v3.2.13) including (>= v6.0.0) index_by index_with (>= v6.0.0) many? none? (<= v2.3.8) _original_sum_with_required... (<= v5.1.7) pick (>= v6.1.3.1) pluck sum to_json (<= v2.3.2) without = private = protected Convert an enumerable to a hash. people.index_by(&:login) #

[Kureduki_Maari]

.｡o(cf. Enumerable#group_by ) index_by (Enumerable) - APIdock

[an-ironic-man]

Enumerableからハッシュへ。each_with_object({}){|hoge, result| result[hoge.id] = hoge } とかしなくてよかったんだ……。