Yajra datatables filter on sub relation - php

Question

I have a DataTable where i return my model. Inside this datatable i would like to get a column that shows a sub relationship and i can filter on that.
Example: Funds Have Member and Member has Cards
I add a column that i made myselh:
FundDataTable.php
->addColumn('cards.date', function(Fund $funds) {
if(count($funds->member->cards()->get())){
return $funds->member->cards()->first()->date;
}else{
return "None";
}
})
public function query(Fund $model)
{
return $model->newQuery()->with('member')->with('fr_status')->with('fr_payment_term')->with('member.cards');
}
protected function getColumns()
{
return [
Column::make('id'),
Column::make('member_id'),
Column::make('lastname'),
Column::make('begin_date'),
Column::make('fr_payment_term.payment_term'),
Column::make('destination'),
Column::make('cards.date'),
Column::make('fr_status.status'),
Column::computed('action')
->exportable(false)
->printable(false)
->addClass('text-center'),
];
}
index.blade.php
columns":[
{
"data": "id",
"name": "id",
"title": "Id",
"orderable": true,
"searchable": true
}, {
"data": "member_id",
"name": "member_id",
"title": "Member Id",
"orderable": true,
"searchable": true
}, {
"data": "lastname",
"name": "member.lastname",
"title": "Last name",
"orderable": true,
"searchable": true
}, {
"data": "begin_date",
"name": "begin_date",
"title": "Begin Date",
"orderable": true,
"searchable": true
}, {
"data": "fr_payment_term.payment_term",
"name": "payment_term",
"title": "Payment Term",
"orderable": true,
"searchable": true
}, {
"data": "destination",
"name": "member.destination",
"title": "Destination",
"orderable": true,
"searchable": true
},{
"data": "cards.date",
"name": "date",
"title": "Cards",
"orderable": true,
"searchable": true
}, {
"data": "fr_status.status",
"name": "status",
"title": "Status",
"orderable": true,
"searchable": true
}, {
"data": "action",
"name": "action",
"title": "Action",
"orderable": false,
"searchable": false,
"className": "text-center"
}
FundController.php
public function index(FundDataTable $dataTable)
{
session(['title' => 'Overview Funds']);
$statusses = ModelOption::where(['model' => 'Fund', 'name' => 'status'])->get();
$paymentTerms = ModelOption::where('model', 'PaymentTerm')->where( 'name','<>', 'status')->get();
$packages = Package::all();
return $dataTable->render('funds.index',[ 'statusses' => $statusses, 'packages' => $packages, 'paymentTerms' => $paymentTerms]);
}
Problem is when I filter on the searchbox for None. it does not work and shows everything.