app/controllers/tables_arrangements_controller.rb

@@ -5,6 +5,8 @@ class TablesArrangementsController < ApplicationController
 
   def show
     @tables_arrangement = TablesArrangement.find(params[:id])
-    @seats = @tables_arrangement.seats.includes(:guest).group_by(&:table_number)
+    @seats = @tables_arrangement.seats
+                                .includes(guest: %i[affinity_groups unbreakable_bonds])
+                                .group_by(&:table_number)
   end
 end

app/views/tables_arrangements/show.html.erb

@@ -10,7 +10,7 @@
 
   <ul>
     <% seats.each do |seat| %>
-      <li><%= seat.guest.full_name %></li>
+      <li><%= seat.guest.full_name %> (<%= seat.guest.affinity_groups.pluck(:name).join(", ") %>)</li>
     <% end %>
   </ul>
 <% end %>