Widgets can now state that they contribute no data when the form is saved

Applied to FileUpload.php

modules/backend/classes/FormWidgetBase.php

@@ -37,6 +37,11 @@ abstract class FormWidgetBase extends WidgetBase
      */
     public $previewMode = false;
 
+    /**
+     * @var int Value returned when the widget should not contribute any save data.
+     */
+    const NO_SAVE_DATA = -1;
+
     /**
      * Constructor
      * @param $controller Controller Active controller object.

modules/backend/formwidgets/FileUpload.php

@@ -178,6 +178,14 @@ class FileUpload extends FormWidgetBase
         $this->addJs('js/fileupload.js', 'core');
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function getSaveData($value)
+    {
+        return FormWidgetBase::NO_SAVE_DATA;
+    }
+
     /**
      * Checks the current request to see if it is a postback containing a file upload
      * for this particular widget.

modules/backend/widgets/Form.php

@@ -11,6 +11,7 @@ use Backend\Classes\FormField;
 use Backend\Classes\WidgetBase;
 use Backend\Classes\WidgetManager;
 use System\Classes\ApplicationException;
+use Backend\Classes\FormWidgetBase;
 
 /**
  * Form Widget
@@ -718,6 +719,8 @@ class Form extends WidgetBase
                 : null;
 
             $data[$field] = $widget->getSaveData($widgetValue);
+            if ($data[$field] === FormWidgetBase::NO_SAVE_DATA)
+                unset($data[$field]);
         }
 
         return $data;