Removing items from a collection.
// get your main collection with all the attributes...
$activities = Activity::all();
// build your second collection with a subset of attributes. this new
// collection will be a collection of plain arrays, not Users models.
$activities = $activities->map(function ($activity) {
return collect($activity->toArray())
->only(['id', 'log_name', 'description'])
->all();
});