Rollup single field across multiple rows with same data (Consultant Reports Example)

gistfile1.rb

@reports_list = ConsultantReport.reports_list(current_admin_user)
@reports = {} 
@reports_list.each_with_index do |report, index|
  team = report.team.name
  user = report.admin_user.name
  @reports[team] = {} unless @reports.include?(team)
  @reports[team][user] = [] unless @reports[team].include?(user)
  @reports[team][user] << [report.week.to_s, report.id]                                                                                                               end