Laravel query builder for recursive results? E.g. id, parent_id

Question

So I have data structured like this:

id|parent_id|name
1 |null     |foo
2 |1        |bar
3 |2        |baz

So basically foo->bar->ba

Answer 1

I modified ruuter answer to use relationships. If you have a parent() belongsTo relationship on the model you can use that one to remove the where clause, see below:

public function parents()
{
        $parents = $this->parent()->get();

        while ($parents->last() && $parents->last()->parent_id !== null) {
                $parent = $parents->last()->parent()->get();
                $parents = $parents->merge($parent);
        }

        return $parents;
}

And then you can access it:

public function allParents(): Collection 
{
        return $this->parents();
}