anchor.diff:                <div class="col-xs-12 col-sm-3">
                   <div class="form-group">
                     <%= f.label :external_id, "External Id" %>
  -                  <%= f.number_field :external_id, class: "form-control", data: { guard: "required" } %>
  +                  <%= f.number_field :external_id, class: "form-control" %>
                   </div>
                 </div>
   
  
positive.code: 
            <div class="row">
              <div class="col-xs-12 col-sm-9">
                <%= f.submit "Save", class: "btn btn-primary" %>
                <%= link_to "Cancel", donors_path, class: "btn btn-default" %>
              </div>
            </div>
  
negative.code:           <div class="row">
              <div class="col-xs-12 col-sm-3">
                <div class="form-group">
                  <label for="import_from_external_id">External Id</label>
                  <input type="number" class="form-control" id="import_from_external_id" name="external_id" data-guard="required" value="<%= @donor.external_id %>" />
                </div>
              </div>
            </div>
  