test/app/Http/Models/Business.php

<?php

namespace App\Http\Models;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasOne;
use Illuminate\Database\Eloquent\SoftDeletes;

class Business extends Model
{
    use SoftDeletes;
    protected $table = 'business';

    public function templateLibrary()
    {
        return $this->hasMany(TemplateLibrary::class, 'business_id', 'id');
    }
}