進行模型關聯操作，
php artisan tinker
執行
$user = App\Models\User::find(1) $user->followings()->attach([2, 3])
報錯，模型關聯定義都是OK的，google了一番，才發現原來是tinker的bug。直接在控制器中調用就沒有報這個錯誤。如果你用tinker也報這個錯了，試一下直接在控制器中操作。by the way，我用的是5.1版本
laravel Tinker報錯 BadMethodCallException with message 'Call to undefined method Illuminate\Database\Query\Builder
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