How do I serach in laravel Eloquent relationships? - laravel

Question

I have a function that returns data as required. When I add a search string so that I can filter the results, no filtering is done.
Function
public function getComboSubItemRequirements(Request $request, $comboId){
$search_string = $request->query('search_string');
$search_string = empty($search_string)
? null
: trim(urldecode($search_string));
$combo = ComboSellable::where('id', $comboId)
->with('sellable')
->with('items')
->first();
$sellable_id = $combo->sellable->sellable_id;
$sellables = Sellable::thisMerchant()
->with('sellable')
->where('sellable_type', '<>', Sellable::COMBO)
->when(!empty($sellable_id) && !is_numeric($sellable_id), function ($q) use($search_string){
$q->whereHasMorph(
'sellable',
[Sellable::SERVICE, Sellable::PRODUCT],
function ($qq) use ($search_string){
return $qq->where('sellable.name', 'like', "%{$search_string}%");
}
);
})
->whereNotIn('id', $combo->items->pluck('sellable_id')->toArray())
->limit(10)
->get();
return response()->json($sellables);
}
}
Result structure
[
{
"id": 3,
"merchant_id": 2,
"sellable_id": 3,
"sellable_type": "App\\Product",
"created_at": null,
"updated_at": null,
"deleted_at": null,
"sellable": {
"id": 3,
"merchant_id": "2",
"name": "Wash and set weave",
"description": "",
"cost": "1000",
"image": null,
"duration": "60",
"remainder_days": null,
"created_at": "2020-12-02T06:59:24.000000Z",
"updated_at": "2021-06-19T16:03:30.000000Z",
"commission": null,
"deleted_at": null,
"can_be_sold": 1,
"tax_id": null,
"tax_method": null
}
},
{
"id": 4,
"merchant_id": 2,
"sellable_id": 4,
"sellable_type": "App\\Product",
"created_at": null,
"updated_at": null,
"deleted_at": null,
"sellable": {
"id": 4,
"merchant_id": "2",
"name": "Wash andset tracks",
"description": "",
"cost": "800",
"image": null,
"duration": "75",
"remainder_days": null,
"created_at": "2020-12-02T06:59:53.000000Z",
"updated_at": "2021-08-21T02:47:18.000000Z",
"commission": null,
"deleted_at": null,
"can_be_sold": 1,
"tax_id": null,
"tax_method": null
}
}
]
I want to search items based on sellable->name. I have added the sellable table to the query but the results are still the same. No search or filtering is done.
How do I filter in such a case?