mint/app/Http/Resources/SearchBookResource.php

<?php

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;
use App\Models\BookTitle;
use App\Models\PaliText;
use Illuminate\Support\Facades\Log;

class SearchBookResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array|\Illuminate\Contracts\Support\Arrayable|\JsonSerializable
     */
    public function toArray($request)
    {
        $book = BookTitle::where('sn',$this->pcd_book_id)->first();
        $data = [
            'pcdBookId'=>$this->pcd_book_id,
            "count"=>$this->co,
        ];
        if($book){
            $toc = PaliText::where('book',$book->book)->where("paragraph",$book->paragraph)->value('toc');
            $data["book"] = $book->book;
            $data["paragraph"] = $book->paragraph;
            $data["paliTitle"] = $toc;
        }else{
            Log::error('book title is null pcd_book_id='.$this->pcd_book_id);
            $data["book"] = 0;
            $data["paragraph"] = 0;
            $data["paliTitle"] = '';
        }
        return $data;
    }
}