GridfieldImportButton - Many_Many

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Silverstripe Version: 4.4.4

So I have a dataobject (class A) with a many_many relationship (class B). I need my client to be able to create a (class A) dataobject and save it. Then using the GridfieldImportButton be able to upload a csv file that can be processed using a custom CsvBulkLoader to populate the many_many (class B) relations.

I have a CsvBulkLoader that works via ModelAdmin, but cannot get the GridfieldImportButton to work when its added to a relationship Gridfield. I have tried using ->setImportForm and also ->setImportIFrame too.

setImportForm - I tried two ways - a standard form and also a form based of the MemberImportForm as that is used by GridfieldImportButton in the Member modeladmin. Neither worked

setImportIFrame - I created a controller with form and submit function. The form appears in the modal, but on submission the submit function is never called. Code shown below:


namespace mspacemedia\sh\Controller;

use mspacemedia\sh\BulkLoaders\SHConstituentCsvBulkLoader;
use mspacemedia\sh\SH_Constituent;
use SilverStripe\Forms\Form;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\FileField;
use SilverStripe\Forms\FormAction;
use SilverStripe\Control\Controller;

class MailingConstituentImportController extends Controller

    private static $allowed_actions = array(

    protected function init()

    public function index(){
        $form = $this->ImportForm();

        return $this->customise(['Form' => $form])->renderWith('MailingConstituentImportController');

    public function ImportForm()
        $fields = FieldList::create();
        $fields->add( FileField::create('CsvFile', 'CSV to Import'));

        $actions = FieldList::create();
        $actions->add( FormAction::create('submit','Upload file' ));

        $form = Form::create($this, 'ImportForm', $fields, $actions);


        return $form;

    public function submit($data, $form)
       //Stub submit 


Any help would be greatly appreciated.

Fixed, will post answer to soon!

I have the same problem. It would be nice to see your solution.

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It would be great to see your solution on this.

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Looks like I better get my writing hat on an get this uploaded here and on too

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That would be massively appreciated :wink:

Just to clarify - the context I am looking for is s using GridFieldImportButton on a GridField within getCMSFields() on a DataObject.

@Ed_Gossage that’s what my solutin does - i’ll post later today