Laravel - latest record from relationship in whereHas() - laravel

Question

This is my first post in here, so please forgive any mistakes :)
I'm currently working on the project of stock management application (Laravel). I came to the point where anything I do doesn't work, so now I beg for help with it.
I have a table with products, of which some are in the relationship with the others. Everything happens in one table. If the product has a child, the child overrides the parent.
products table view
Then, all the queries I run on them use the following logic:
If the item doesn't have any child, use it.
If the item has children, use the latest child (highest id)
Now I have the relationships created in model file:
public function childItems(){
return $this->hasMany('\App\OrderItem','parent_id');
}
public function parentItem(){
return $this->belongsTo('\App\OrderItem','parent_id');
}
public function latestChild(){
return $this->hasOne('\App\OrderItem','parent_id')->orderBy('id','desc')->limit(1);
}
The problem with latestChild() relationship is, that when you run this query:
\App\OrderItem::find(7)->latestChild()->get()
It works fine and returns only one (latest)(id 6) record in relationship - to do it I had to add orderBy and limit to hasOne().
But when I want to use this relationship in scopes, so in whereHas method, it doesn't work properly, as takes any of the children instead of the latest one.
public function scopeDue($query){
return $query->where(function($q){
$q->has('childItems','==',0)->has('parentItem','==',0)->whereDate('due_date','=', Carbon::today()->toDateString())->whereNull('return_date');
})->orWhere(function($q2){
$q2->has('childItems')->has('parentItem','==',0)->whereHas('childItems',function($q3) use($q2){
$q3->whereDate('due_date','=', Carbon::today()->toDateString())->whereNull('return_date');
});
})->with('latestChild');
}
However, with() at the end returns the right record.
I think, the reason it works so is because my relationship latestChild() returns all the children (despite hasOne()) and when i use it in whereHas it ignores the filtering functions I applied.
I know it's a little bit complex from what I describe, but to explain it better I will use an example. Executing the following in tinker
\App\OrderItem::due()->get();
Should return only record id 2, as the number seven has children, where of course id 5 is due, but the latest child is id 6 which is not due.
I hope I've explained it enough to let you help me, as I'm already going crazy with it.
If you have any ideas on how I could achieve what I need by changing exisiting one or changing the whole logic of it, please help!
Thanks,
Darek

Answer 1

Try this one:
->with(
[
'latestChild' => function (HasOne $query) {
return $query->latest('id')->limit(1);
}
]
);

Answer 2

I think the problem is in your latestChild() method where you do a limit(1). Why don't you try the last() method instead?
So:
public function latestChild(){
return $this->hasOne('\App\OrderItem','parent_id')->last();
}
EDIT:
What about returning the value like this:
public function latestChild(){
$item = App\OrderItem::all()->last();
return $item;
}