Unable to customize filter/ search form of ModelAdmin in SilverStripe 4.4.4 - silverstripe

Question

I am working on a SilverStripe project. Basically, I updated my project to SilverStripe version 4.4.4. After the upgrade, I found out that the search/ filter forms of the ModelAdmin were changed as in the screenshot below.
What I am trying to do now is that I am trying to customize the fields of the search/ filter form of the ModelAdmin following this lesson. https://www.silverstripe.org/learn/lessons/v4/introduction-to-modeladmin-1.
I have a data object class that is linked to a model admin class. Following is the dummy code of the model admin class.
class EnquirySubmission extends DataObject
{
private static $db = [
//some hidden fields are here
];
private static $has_one = [
'Member' => Member::class
];
private static $summary_fields = [
'Member.Name' => 'Member',
//some hidden fields are here
];
//some hidden code goes here
public function searchableFields()
{
return [
'Member.Name' => [
'filter' => 'PartialMatchFilter',
'title' => 'Member',
'field' => \SilverStripe\Forms\DropdownField::create('Member.Name')
->setSource(
Member::get()->map('ID','Email')
)->setEmptyString('-- Member --')
],
];
}
}
As you can see in the code, I am customizing the filter/ search form by overriding the searchableFields method. But it does not work in the upgraded version of SilverStripe. What am I missing and how can I fix it?

Answer 1

Silverstripe and ModelAdmin are ace, but it is confusing why this date range search issue has required a tweak in every version so far. This is a complete example that I've just got working on 4.7.2 (latest stable at time of post)...
app/src/Test/MyDataObject.php
namespace MyVendor\MyNamespace;
use SilverStripe\Forms\DateField;
use SilverStripe\ORM\DataObject;
class MyDataObject extends DataObject {
private static $db = [
'Title' => 'Varchar',
'MyDateTimeField' => 'DBDatetime'
];
private static $summary_fields = ['Title','MyDateTimeField'];
public function updateAdminSearchFields($fields) {
$fields->removeByName('MyDateTimeField');//needed as added in summary field
$fields->push(DateField::create('MyDateTimeField:GreaterThanOrEqual', 'MyDateTimeField (Start)'));
$fields->push(DateField::create('MyDateTimeField:LessThanOrEqual', 'MyDateTimeField (End)'));
}
}
app/src/Test/MyAdmin.php
namespace MyVendor\MyNamespace;
use SilverStripe\Admin\ModelAdmin;
class MyAdmin extends ModelAdmin {
private static $menu_title = 'MyAdmin';
private static $url_segment = 'myadmin';
private static $managed_models = [MyDataObject::class];
public function getList() {
$list = parent::getList();
if ($params = $this->getRequest()->requestVar('filter'))
if ($filters = $params[$this->sanitiseClassName($this->modelClass)])
return $list->filter($filters);
return $list;
}
}
app/src/Test/MyAdminExtension.php
namespace MyVendor\MyNamespace;
use SilverStripe\ORM\DataExtension;
class MyAdminExtension extends DataExtension {
public function updateSearchContext($context) {
$class = $context->getQuery([])->dataClass();
if (method_exists($class, 'updateAdminSearchFields'))
(new $class)->updateAdminSearchFields($context->getFields());
return $context;
}
}
app/_config/mysite.yml
MyVendor\MyNamespace\MyAdmin:
extensions:
- MyVendor\MyNamespace\MyAdminExtension