app/controllers/tables_arrangements_controller.rb

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

app/views/tables_arrangements/show.html.erb

@@ -0,0 +1,16 @@
+<h1>ID: <%= @tables_arrangement.id %></h1>
+
+<p>Discomfort: <%= @tables_arrangement.discomfort %></p>
+
+<h2>Seats</h2>
+
+<% @seats.each do |table_number, seats| %>
+
+  <h3>Table <%= table_number %></h3>
+
+  <ul>
+    <% seats.each do |seat| %>
+      <li><%= seat.guest.full_name %></li>
+    <% end %>
+  </ul>
+<% end %>