can display relation between author

app/views/desktop/co_authors/_form.html.erb

@@ -17,7 +17,7 @@
 
 
   <%= f.label :type%><br />
-  <select name="co_author[type]" id="" class="s_grid s_grid_4">
+  <select name="co_author[co_author_relations_id]" id="" class="s_grid s_grid_4">
     <%= options_for_select(
       @co_author_relations.map do |relation|
         [relation.relation, relation.id]

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

@@ -17,7 +17,8 @@
   <tr>
     <td><%= co_author.co_author %></td>
     <td><%= co_author.email %></td>
-    <td><%= co_author.type%></td>
+    <td><%= @co_author_relations.find(co_author.co_author_relations_id).relation \
+                unless co_author.co_author_relations_id.nil?%></td>
     <td><%= link_to 'Edit', edit_desktop_co_author_path(co_author), :class => "bt-edit" %></td>
     <td><%= link_to 'Destroy', desktop_co_author_path(co_author), method: :delete, confirm: 'Are you sure?', :class=>"bt-delete"  %></td>
   </tr>