Using multiple keys for route model binding in Laravel

RouteServiceProvider.php

<?php


public function boot()
{
  Route::bind('course', function ($value) {
    return Course::where('slug', $value)->orWhere(function ($query) use ($value) {
      if (is_numeric($value)) {
        $query->where('id', $value);
      }

    })->firstOrFail();
  });


  parent::boot();
}