ActiveRecord query method chains

chains.rb

User.all.includes(:questions).map(&:question_ids).flatten.group_by { |n| n }.map { |k,v| [ k, v.size ] }.sort_by { |a| a.last }.each { |a| max = a.last if a.last > max }.select { |e| e.last == max }

User.all.map(&:question_ids).flatten.group_by { |n| n }.map { |k,v| [ k, v.size ] }.sort_by { |a| a.last }.each { |a| max = a.last if a.last > max }.select { |e| e.last == max }