add a Cancel button

devices/templates/devices/device_create.html

@@ -8,6 +8,7 @@
     {% csrf_token %}
     {{ form|crispy }}
     <input type="submit" value="Save" class="btn btn-primary">
+    <a href="{% url 'devices' view.kwargs.pk %}" class="btn btn-secondary">Cancel</a>
 </form>
 </div>
 {% endblock %}