From: babanba.n@... Date: 2017-06-10T14:26:04+00:00 Subject: [ruby-dev:50147] [Ruby trunk Feature#13563] Implement Hash#choice method. Issue #13563 has been updated by babanba-n (matzbara masanao). And, I fix to Hash#pick. https://github.com/baban/ruby/commit/fa9d1d6291e4507c5fdd997c269cd1cd68003899 ---------------------------------------- Feature #13563: Implement Hash#choice method. https://bugs.ruby-lang.org/issues/13563#change-65343 * Author: babanba-n (matzbara masanao) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- Hi, I propose Hash#choice method. It pick up key and value pairs in Hash like a below code. ~~~ { :a => 1, 2 => "2", "c" => true }.choice(:a, 2) # => { :a => 1, 2 => "2" } { :a => 1, 2 => "2", "c" => true }.choice("c", 10000) # => { "c" => true, 10000 => nil } ~~~ This method is useful when Hash have many keys, but programer need few key's. For instance, it pick up personal data in ActiveRecord model's data, and migrate to new device. ~~~ feature_phone_user = User.find(params[:src_user_id]) profile = feature_phone_user.attributes.choice(*%i[nickname email sex birthday prefecture]) smart_phone_user = User.new smart_phone_user.attributes = profile ~~~ In other case, it pick up latest log from http request parameter. ~~~ condition = params.to_h.choice("user_id", "service_id") latest_payment_log = PaymentLog.find_by(condition).last ~~~ If this method exist, I guess that many cases change to comfortable just a little. Please consider about it. And I write it. https://github.com/baban/ruby/commit/4014ebe2ae261881669bef8369eb08aaecef2034 -- https://bugs.ruby-lang.org/