Laravel Many to one in Resource - laravel

Question

I use laravel 8 & have 3 table:
Products, ProductPrice & ProductsPublisher:
this is my Products model for this relationship:
public function lastPrice(){
return $this->hasMany(ProductPrice::class)->where('status','active')->orderBy('created_at','DESC')->distinct('publisher_id');
}
and this is my productsPrice model for publisher relationship:
public function getPublisher(){
return $this->belongsTo(ProductsPublisher::class,'publisher_id');
}
now, i want to use laravel resource for my api, i wrote products resource:
public function toArray($request)
{
return [
'id' => $this->id,
'price' => lastPrice::make($this->lastPrice),
'status' => $this->status,
'slug' => $this->slug,
'title' => $this->title,
'description' => $this->description,
'txt' => $this->txt,
'lang' => $this->lang,
'created_at' => $this->created_at,
'updated_at' => $this->updated_at,
];
but in lastPrice resource, when i wrote like this:
return [
'id' => $this->id,
'main_price' => $this->main_price
];
it give me this error:
Property [id] does not exist on this collection instance.
when i use this code:
return parent::toArray($request);
get response but because i need to use another relationship in my lastPirce for publishers, i cant use that code and should return separately my data.
What i should to do?
thanks
Edit 1:
this is my Controller Code:
$products = Product::where('id',$id)->where('slug',$slug)->where('status','confirm')->first();
if(!$products){
return $this->sendError('Post does not exist.');
}else{
return $this->sendResponse(new \App\Http\Resources\Products\Products($products), 'Posts fetched.');
}
and this is sendResponse & sendError:
public function sendResponse($result, $message)
{
$response = [
'success' => true,
'data' => $result,
'message' => $message,
];
return response()->json($response, 200);
}
public function sendError($error, $errorMessages = [], $code = 404)
{
$response = [
'success' => false,
'message' => $error,
];
if(!empty($errorMessages)){
$response['data'] = $errorMessages;
}
return response()->json($response, $code);
}
thanks.
Edit 2:
i change my lastPrice Resource toArray function to this and my problem solved, but i think this isn't a clean way, any better idea?
$old_data = parent::toArray($request);
$co = 0;
$new_data = [];
foreach ($old_data as $index){
$publisher_data = Cache::remember('publisher'.$index['publisher_id'], env('CACHE_TIME_LONG') , function () use ($index) {
return ProductsPublisher::where('id' , $index['publisher_id'])->first();
});
$new_data[$co]['main_prices'] = $index['main_price'];
$new_data[$co]['off_prices'] = $index['off_price'];
$new_data[$co]['publisher'] = SinglePublisher::make($publisher_data);
$new_data[$co]['created_at'] = $index['created_at'];
$co++;
}
return $new_data;