进行模型关联操作，
php artisan tinker
执行
$user = App\Models\User::find(1) $user->followings()->attach([2, 3])
报错，模型关联定义都是OK的，google了一番，才发现原来是tinker的bug。直接在控制器中调用就没有报这个错误。如果你用tinker也报这个错了，试一下直接在控制器中操作。by the way，我用的是5.1版本
laravel Tinker报错 BadMethodCallException with message 'Call to undefined method Illuminate\Database\Query\Builder
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