generic class for resources controllers on Laravel

APIController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Database\QueryException;
use Illuminate\Http\Request;

class APIController extends Controller
{
    public static function index($model, $relation = null)
    {
        if($relation)
            $obj = $model::all()->load($relation);
        else
            $obj = $model::all();

        $data = array(
            'status' => 'success',
            'data' => $obj
        );

        return response()->json($data, 200);
    }

    public static function store($model, Request $request)
    {
        try {
            $obj = new $model($request->all());
            $obj->save();

            $data = DataResponse::getDataSuccess($obj);
        } catch (QueryException $exception) {
            $data = DataResponse::getDataFail($exception->errorInfo[2]);
        }

        return response()->json($data, 200);
    }

    public static function destroy($id, $model)
    {
        $model::destroy($id);

        $data = array(
            'status' => 'success',
            'message' => 'object destroyed'
        );

        return response()->json($data, 200);
    }

    public static function update($id, Request $request, $model)
    {
        $obj = $model::findOrFail($id);
        $obj->update($request->all());

        $data = array(
            'status' => 'success',
            'message' => 'object modified',
            'data' => $obj
        );

        return response()->json($data, 200);
    }

    public static function show($id, $model)
    {
        $obj = $model::find($id);

        $data = array(
            'status' => 'success',
            'data' => $obj
        );

        return response()->json($data, 200);
    }
}