A ton of stuff was done to finalize the app for use

app/views/mats/_form.html.erb

@@ -0,0 +1,31 @@
+<%= form_for(@mat) do |f| %>
+  <% if @mat.errors.any? %>
+    <div id="error_explanation">
+      <h2><%= pluralize(@mat.errors.count, "error") %> prohibited this mat from being saved:</h2>
+
+      <ul>
+      <% @mat.errors.full_messages.each do |msg| %>
+        <li><%= msg %></li>
+      <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div class="field">
+    <%= f.label :name %><br>
+    <%= f.text_field :name %>
+  </div>
+
+<% if @tournament_field %>
+      <%= f.hidden_field :tournament_id, :value => @tournament_field %>
+<% else %>
+    <div class="field">
+      <%= f.label 'Tournament' %><br>
+      <%= f.collection_select :tournament_id, Tournament.all, :id, :name %>
+    </div>
+<% end %>
+
+  <div class="actions">
+    <%= f.submit %>
+  </div>
+<% end %>

app/views/mats/edit.html.erb

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+<h1>Editing mat</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Show', @mat %> |
+<%= link_to 'Back', mats_path %>

app/views/mats/index.html.erb

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+<h1>Listing mats</h1>
+
+<table>
+  <thead>
+    <tr>
+      <th>Name</th>
+      <th>Tournament</th>
+      <th></th>
+      <th></th>
+      <th></th>
+    </tr>
+  </thead>
+
+  <tbody>
+    <% @mats.each do |mat| %>
+      <tr>
+        <td><%= mat.name %></td>
+        <td><%= mat.tournament_id %></td>
+        <td><%= link_to 'Show', mat %></td>
+        <td><%= link_to 'Edit', edit_mat_path(mat) %></td>
+        <td><%= link_to 'Destroy', mat, method: :delete, data: { confirm: 'Are you sure?' } %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>
+
+<br>
+
+<%= link_to 'New Mat', new_mat_path %>

app/views/mats/index.json.jbuilder

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+json.array!(@mats) do |mat|
+  json.extract! mat, :id, :name, :tournament_id
+  json.url mat_url(mat, format: :json)
+end

app/views/mats/new.html.erb

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+<h1>New mat</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Back', mats_path %>

app/views/mats/show.html.erb

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+<p id="notice"><%= notice %></p>
+
+<p>
+  <strong>Name:</strong>
+  <%= @mat.name %>
+</p>
+
+<p>
+  <strong>Tournament:</strong>
+  <%= @mat.tournament_id %>
+</p>
+
+<%= link_to 'Edit', edit_mat_path(@mat) %> |

app/views/mats/show.json.jbuilder

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+json.extract! @mat, :id, :name, :tournament_id, :created_at, :updated_at