show existent attachments

app/views/learning_objects/build/_file_upload_form.html.erb

@@ -21,6 +21,17 @@
     </div>
 
     <br>
+    <div id="existentsAttachments" class="panel">
+      <% @learning_object.attachments.each do |attachment| %>
+        <dl>
+          <dt><%= image_tag attachment.thumbnail.url(:small) %></dt>
+          <dd>
+            <button class="btn btn-primary"><i class="fa fa-star"></i>&nbspDefinir como principal</button>
+            <button class="btn btn-danger"><i class="fa fa-trash"></i>&nbspApagar</button>
+          </dd>
+        </dl>
+      <% end %>
+    </div>
     <div id="results" class="panel"></div>
 
     <div class="large-12 columns">
@@ -45,6 +56,18 @@
 
   #uploadThumbnail { display: none; }
 
+  #existentsAttachments {
+    float: left;
+    width: 100%;
+  }
+
+  #existentsAttachments dl { float: left;
+    width: 100%;
+    height: 50px; }
+
+  #existentsAttachments dl dd, dt { float: left; }
+  #existentsAttachments dl dt { margin-right: 10px; }
+
   .drop-zone > #selectFiles{
     padding-top: 10px;
     font-family: 'Roboto-Ultra-Bold', sans-serif;