improve UX unassigned devices view

- added updated column (TODO sort it)
- buttons of lot actions on top

dashboard/templates/unassigned_devices.html

@@ -25,6 +25,9 @@
 <div class="dataTable-container">
   <form method="post">
   {% csrf_token %}
+
+  Lot actions: <button class="btn btn-green-admin" type="submit" name="url" value="{% url 'lot:add_devices' %}">Add</button> <button class="btn btn-green-admin" type="submit" value="{% url 'lot:del_devices' %}" name="url">Remove</button>
+
   <table class="table">
     <thead>
       <tr>
@@ -43,6 +46,9 @@
         <th scope="col" data-sortable="">
           model
         </th>
+        <th scope="col" data-sortable="">
+          updated
+        </th>
       </tr>
     </thead>
     {% for dev in devices %}
@@ -69,11 +75,13 @@
             {{ dev.model }}
 	  {% endif %}
         </td>
+        <td>
+            {{ dev.updated }}
+        </td>
       </tr>
     </tbody>
     {% endfor %}
   </table>
-  <button class="btn btn-green-admin" type="submit" value="{% url 'lot:del_devices' %}" name="url">Remove</button> <button class="btn btn-green-admin" type="submit" name="url" value="{% url 'lot:add_devices' %}">add</button>
   </form>
 </div>
 <div class="row mt-3">

device/models.py

@@ -356,6 +356,12 @@ class Device:
         self.get_last_evidence()
         return self.last_evidence.get_manufacturer()
 
+    @property
+    def updated(self):
+        """get timestamp from last evidence created"""
+        self.get_last_evidence()
+        return self.last_evidence.created
+
     @property
     def serial_number(self):
         self.get_last_evidence()