Remove Add and Delete buttons from DataObject ModelAdmin - silverstripe

Question

I have custom data object with predefined entries. I don't want user to delete or add any new entries from GridField's edit form. Is there a way to remove those two buttons form ModelAdmins GridField edit form?
Using: Silverstripe 3.6

Answer 1

To remove actions from a GridField "globally", eg. for all records managed by the GridField, it's best to modify the GridFieldConfig instance.
In a ModelAdmin context, this is possible by overriding getEditForm:
public function getEditForm($id = null, $fields = null)
{
$form = parent::getEditForm($id, $fields);
// make sure to check if the modelClass matches the object you want to edit
// otherwise, the config will get applied to all models managed
// by this ModelAdmin instance
if ($this->modelClass === Translation::class) {
$fieldName = $this->sanitiseClassName($this->modelClass);
/** #var GridField $grid */
if ($grid = $form->Fields()->dataFieldByName($fieldName)) {
$grid->getConfig()->removeComponentsByType([
GridFieldDeleteAction::class,
GridFieldAddNewButton::class
]);
}
}
return $form;
}
However, the user might still be able to delete a record in the detail-view. But since both, GridField and detail-view respect DataObject permissions, you should make use of them… this also prevents that a user can delete the object via other means.
A simplistic solution would be (these methods should be implemented in your DataObject):
public function canDelete($member = null)
{
return Permission::check('ADMIN');
}
public function canCreate($member = null)
{
return Permission::check('ADMIN');
}
public function canView($member = null)
{
return true;
}
public function canEdit($member = null)
{
return Permission::check('CMS_ACCESS_TranslationAdmin');
}
That way, only administrators can create/delete these objects. They can be viewed by all users and edited by users that have access to your ModelAdmin section (here named "TranslationAdmin").

Answer 2

Ok, i got it my self. If you want to remove Add and Delete buttons from managed model's ModelAdmin you need to add this code
class Translation extends DataObject {
// ...
public function canDelete($member = null) {
return false;
}
}
class TranslationAdmin extends ModelAdmin {
public static $managed_models = ['Translation'];
static $url_segment = 'translations';
static $menu_title = 'Translations';
public function getEditForm($id = null, $fields = null) {
$form = parent::getEditForm($id, $fields);
$form
->Fields()
->fieldByName($this->sanitiseClassName($this->modelClass))
->getConfig()
->removeComponentsByType('GridFieldDeleteAction')
->removeComponentsByType('GridFieldAddNewButton');
return $form;
}
}
Hope this helps for someone in future.