Sorting Laravel Collection via Array of ID’s

by

You can do this:

$order = $list->item_order;
$list->items->sortBy(function($model) use ($order){
    return array_search($model->getKey(), $order);
}

Also you could add an attribute accessor to your model which does the same

public function getSortedItemsAttribute() 
{
    if ( ! is_null($this->item_order)) {
        $order = $this->item_order;

        $list = $this->items->sortBy(function($model) use ($order){
            return array_search($model->getKey(), $order);
        });
        return $list;
    }
    return $this->items;
}

Usage:

foreach ($list->sortedItems as $item) {
    // More Code Here
}

If you need this sort of functionality in multiple places I suggest you create your own Collection class:

class MyCollection extends Illuminate\Database\Eloquent\Collection {

    public function sortByIds(array $ids){
        return $this->sortBy(function($model) use ($ids){
            return array_search($model->getKey(), $ids);
        }
    }
}

Then, to actually use that class override newCollection() in your model. In this case it would be in the ChecklistItems class:

public function newCollection(array $models = array())
{
    return new MyCollection($models);
}

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