add co-author db and curd page, but it can't destory it...

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

@@ -0,0 +1,44 @@
+<% if @co_author.errors.any? %>
+  <div id="error_explanation">
+    <h2><%= pluralize(@co_author.errors.count, "error") %> prohibited this user from being saved:</h2>
+    <ul>
+      <% @co_author.errors.full_messages.each do |msg| %>
+        <li><%= msg %></li>
+      <% end %>
+    </ul>
+  </div>
+<% end %>
+<div class="fn_g hp">
+
+  <%= button_tag "Save", name: "commit", value: "Save", class: "fn_btn hh2 thmc2 thmtxt" %>
+  <%= button_tag "Cancel", name: "commit", value: "Cancel", class: "fn_btn hh2 thmc2 thmtxt" %>
+</div>
+
+<div></div>
+<ul>
+  <li class="s_grid_row">
+  <%= f.label :co_author %><br />
+  <%= f.text_field :co_author %>
+  </li>
+
+  <li class="s_grid_row">
+  <%= f.label :email %><br />
+  <%= f.text_field :email %>
+  </li>
+
+  <li class="s_grid_row">
+  <%= f.label :type%><br />
+  <select name="co_author[type]" id="" class="s_grid s_grid_4">
+    <%= options_for_select(
+      [["朋友","朋友"],
+       ["學生","摯友"],
+       ["老師","老師"],
+       ["摯友","摯友"],
+       ["親戚","親戚"],
+       ["同事","同事"],
+       ["共同作者","共同作者"]
+    ])
+  %>
+  </select>
+  </li>
+</ul>

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

@@ -0,0 +1,3 @@
+<%= form_for @co_author, url: desktop_co_author_path(@co_author) do |f| %>
+  <%= render partial: 'desktop/co_authors/form', locals: {:f => f} %>
+<% end %>

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

@@ -0,0 +1,20 @@
+<table>
+  <tr>
+    <th>Name</th>
+    <th>EMail</th>
+    <th>Type</th>
+    <th></th>
+    <th></th>
+    <th></th>
+  </tr>
+
+<% @co_authors.each do |co_author| %>
+  <tr>
+    <td><%= co_author.co_author %></td>
+    <td><%= co_author.email %></td>
+    <td><%= co_author.type%></td>
+    <td><%= link_to 'Destroy', desktop_co_author_path(co_author), method: :delete, confirm: 'Are you sure?'  %></td>
+  </tr>
+<% end %>
+</table>
+<br />

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

@@ -0,0 +1,3 @@
+<%= form_for @co_author, url: desktop_co_authors_path do |f| %>
+  <%= render partial: 'desktop/co_authors/form', locals: {:f => f} %>
+<% end %>