Custom backend FormAction handler not found - php

Question

My goal is it to add a custom FormAction to a DataObjects EditForm inside a ModelAdmin, next to the "Save" and "Delete" action.
The setup:
With updateCMSActions I can add that button.
class MyActionEventExtension extends DataExtension {
public function updateCMSActions(FieldList $actions) {
if($this->owner->canEdit(Member::currentUser())) {
$actions->push(FormAction::create('doMyAction', 'Action'));
}
return $actions;
}
}
This works perfectly fine.
Following this answer on stackoverflow I created a LeftAndMainExtension for the actions handler.
class MyActionLeftAndMainExtension extends LeftAndMainExtension {
private static $allowed_actions = array(
'doMyAction'
);
public function doMyAction($data, $form) {
// Do stuff.
// ... I never get here.
// Return stuff
$this->owner->response->addHeader(
'X-Status',
rawurlencode('Success message!')
);
return $this->owner->getResponseNegotiator()
->respond($this->owner->request);
}
}
The corresponding config.yml file looks like this:
LeftAndMain:
extensions:
- MyActionLeftAndMainExtension
TheDataObject:
extensions:
- MyActionEventExtension
The Problem:
When I click the button, the response gives me "404 Not Found".
The requested URL always is the same:
http://localhost/admin/model-admin-url-slug/TheDataObject/EditForm/field/TheDataObject/item/878/ItemEditForm
Some other solutions I found, suggested to extend the ModelAdmins GridField. This sadly is not an option, since the DataObject I need that action for has alot of relations, which means, it's EditForm also appears in other DataObjects EditForms (nested).
I'm really running out of ideas. Did I miss something within my ModelAdmin? The one I created only implements the basic static vars, so I didn't posted it here.
Any help would be great!
Update:
I ended up, providing a getEditForm method on my ModelAdmin.
public function getEditForm($id = null, $fields = null) {
$form = parent::getEditForm($id, $fields);
$listField = $form->Fields()->fieldByName($this->modelClass);
if ($gridField = $listField->getConfig()->getComponentByType('GridFieldDetailForm')) {
$gridField->setItemRequestClass('MyAdminForm_ItemRequest');
}
return $form;
}
and extending the GridFieldDetailForm_ItemRequest:
class MyAdminForm_ItemRequest extends GridFieldDetailForm_ItemRequest {
private static $allowed_actions = array (
'edit',
'view',
'ItemEditForm'
);
public function ItemEditForm() {
$form = parent::ItemEditForm();
$formActions = $form->Actions();
// Adds all FormActions provided by the model's `getCMSActions` callback
if ($actions = $this->record->getCMSActions()) {
foreach ($actions as $action) {
$formActions->push($action);
}
}
return $form;
}
public function doAction($data, $form) {
// do stuff here
}
}
Sadly this doesn't add an action on has_many or many_many relation gridfields.. and because of that, I'll leave the question opened and unanswered. Maybe sometime there will be a better solution.. :)

Answer 1

One very simple answer to this question (if it's an option for you) is to use the Better Buttons module: https://github.com/unclecheese/silverstripe-gridfield-betterbuttons#creating-a-custom-action
It lets you define the actions on the model, which is a bit questionable from an architecture standpoint, but also works pretty well in the context of Silverstripe and ModelAdmin.