Laravel Eloquent Model :: find不起作用

Question

This don't work:

$object = Model::find($id);

This works:

$object = Model::where('id', '=', $id)->first();

It doesn't make sense. Am I missing something? I'm using Laravel 5.2.36.

Answer 1

id needs to be a primary key, see: https://laravel.com/api/5.2/Illuminate/Database/Eloquent/Model.html#method_find