separate relation list from index page and render it

app/views/desktop/co_author_relations/_show_form.html.erb

@@ -0,0 +1,6 @@
+<% @co_author_relations.each do |co_author_relation| %>
+  <tr>
+    <td><%= co_author_relation.relation %></td>
+    <td><%= link_to 'Destroy', desktop_co_author_relation_path(co_author_relation), confirm: 'Are you sure?', method: :delete %></td>
+  </tr>
+<% end %>

app/views/desktop/co_author_relations/index.html.erb

@@ -9,10 +9,6 @@
     <th></th>
   </tr>
 
-<% @co_author_relations.each do |co_author_relation| %>
-  <tr>
-    <td><%= co_author_relation.relation %></td>
-    <td><%= link_to 'Destroy', desktop_co_author_relation_path(co_author_relation), confirm: 'Are you sure?', method: :delete %></td>
-  </tr>
-<% end %>
+<%= render 'show_form'%>
+
 </table>