Rails eager_load controller example

gistfile1.rb

 def scoring
    @heat = Heat.find(params[:heat_id])
    @judge = current_user
    @event = Event.find(params[:event_id]) 
    # {st_id => [team#, [team, member, names]]}
    @team_info = ScheduledTeam.eager_load(
      heat: {
        score_system: :score_terms,
        scheduled_teams: {
          registered_team: {
            team: {}
        }
      }
    }).where(heats: {id: @heat.id}).
      reduce ({}) do |acc, st|
        acc.merge(st.id => 
          [st.registered_team.team.num(@event.id).try(:num),
            st.registered_team.team.users.flat_map(&:name)])
      end
 end