Laravel - Commit dynamically created collection to database for a given model

I created a collection in Laravel using:

$collection = new Collection;

Then I proceeded to push multiple items (all of the same model type) into that collection:

$item = $items->first(function($item) {
    return $item->field == "value";
});

$collection->push($item);

And finally, I'm attempting to update all of the records that are now in $collection by using $collection->update() or $collection->save() but I'm receiving the follow error:

"Method Illuminate\Support\Collection::update does not exist."

But since I'm using new Collection (and I've also tried collect()), and I'm calling update() non-statically, I was not expecting this error.

How can I update my database records in $collection all at once? Alternatively, is there a way to "queue" up changes on multiple different child objects that will not sacrifice performance?

Thanks!

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