Explicit about speakers' sort order for a session having multiple speakers

Author: amatsuda

lib/ruby_kaigi.rb

@@ -47,7 +47,7 @@ def self.schedule(event)
           else
             program_sessions = time_slots.select(&:program_session).sort_by {|s| s.room.grid_position }.map(&:program_session)
             type = program_sessions.one? && program_sessions.first.session_format.name == 'Keynote' ? 'keynote' : 'talk'
-            talks = program_sessions.to_h {|ps| [ps.time_slot.room.name, ps.speakers.first.decorate.social_account] }
+            talks = program_sessions.to_h {|ps| [ps.time_slot.room.name, ps.speakers.sort_by(&:created_at).first.decorate.social_account] }
             {type: type, begin: start_time.strftime('%H:%M'), end: end_time.strftime('%H:%M'), talks: talks}
           end
         end