向Eloquent集合添加新属性

正在尝试将新属性添加到现有集合并访问该集合。

我需要的是:

$text = Text::find(1);  //Text model has properties- id,title,body,timestamps
$text->user = $user;

并通过访问用户, $text->user .

探索文档,我发现 put , prepend , setAttribute 方法。

$collection = collect();
$collection->put('a',1);
$collection->put('c',2);
echo $collection->c; //Error: Undefined property: Illuminate\Support\Collection::$c

$collection = collect();
$collection->prepend(1,'t');
echo $collection->t = 5; //Error: Undefined property: Illuminate\Support\Collection::$t

和

$collection = collect();
$collection->setAttribute('c',99); // Error: undefined method setAttribute
echo $collection->c;

有什么帮助吗?