laravel-crud-show

public function show(Request $request)
{
    //
    try {
        //code...
        $param = $request->header('param');
        if ($param) {
            # code...
            $param = json_decode($param, true);
            $validator = Validator::make($param, [
                'id' => 'numeric',
                'id_user' => 'numeric',
                'title' => 'max:255',
                'min_amount' => 'numeric|min:0',
                'max_amount' => 'numeric|min:0',
                'type' => 'in:cr,db',
                'status' => 'in:0,1',
                'start_date' => 'date_format:Y-m-d',
                'end_date' => 'date_format:Y-m-d'
            ]);

            if ($validator->fails()) {
                return $this->getResponse(406, $validator->errors()->first());
            }

            $query = Transactions::query();
            if (isset($param['id'])) $query->where('id', $param['id']);
            if (isset($param['id_user'])) $query->where('id_user', $param['id_user']);
            if (isset($param['title'])) $query->where('title', 'like', '%'.$param['title'].'%');
            if (isset($param['type'])) $query->where('type', $param['type']);
            if (isset($param['status'])) $query->where('status', $param['status']);
            if (isset($param['min_amount'])) $query->where('amount', '>=', $param['min_amount']);
            if (isset($param['max_amount'])) $query->where('amount', '<=', $param['max_amount']);
            if (isset($param['start_date'])) $query->where('date', '>=', $param['start_date']);
            if (isset($param['end_date'])) $query->where('date', '<=', $param['end_date']);
            $transactions = $query->get();

            return $this->getResponse(200, false, $transactions);
        }
        else {
            $transactions = Transactions::all();
            return $this->getResponse(200, false, $transactions);
        }
    } catch (\Throwable $th) {
        //throw $th;
        // dd($th);
        return $this->getResponse(500, $th);
    }
}