Add missing methods in DatagridInterface + add Datagrid::setValue option

Datagrid/Datagrid.php

@@ -141,6 +141,16 @@ class Datagrid implements DatagridInterface
         return $this->values;
     }
 
+    /**
+     * @param $name
+     * @param $value
+     * @return void
+     */
+    public function setValue($name, $operator, $value)
+    {
+        $this->values[$name] = array('type' => $operator, 'value' => $value);
+    }
+
     /**
      * @return \Sonata\AdminBundle\Admin\FieldDescriptionCollection
      */

Datagrid/DatagridInterface.php

@@ -63,4 +63,18 @@ interface DatagridInterface
      * @return array
      */
     function getColumns();
+
+    /**
+     * @abstract
+     * @param $name
+     * @param $value
+     * @return void
+     */
+    function setValue($name, $operator, $value);
+
+    /**
+     * @abstract
+     * @return \Symfony\Component\Form\Form
+     */
+    function getForm();
 }