Count from hasManyThrough relationship with eager loading (need only Count) - laravel

Question

I only need the count, don't want to retrive the results or perform query each time for each row. This is why I want eager loading.
I have 3 tables like the following:
Admins
id
Posts
id
admin_id
Comments
id
user_id //nullable (null if comment from admin)
admin_id //nullable (null if comment from user)
news_id
Now I want to retrieve all the posts from a single admin and all the comments count from those posts, without retrieving all the comments for posts, ONLY COUNT of comments,
With eager loading to avoid n+1 query issue;
Here I think we should make a relation to be used with eager loading like the following:
//admin model
public function commentsCountRelation()
{
return $this->hasManyThrough(Comment::class, News::class, 'admin_id', 'news_id')
->selectRaw('news_id, count(*) as count')
->groupBy('news_id');
}
--Look Here I used hasManyThrough relation because, news_id is not in Admins table.
Then I should make an attribute, to access the count easyly, like:
public function getCommentsCountAttribute()
{
return $this->commentsCountRelation->first()->count ?? 0;
}
Then access it like:
$admin = Admin::with('commentsCountRelation')->findOrFail($id);
$admin->commentsCount;
But it always returns null, why is that?
The following works for hasMany & belongsTo, I've used it on my other models like:
//relation
public function ordersCountRelation()
{
return $this->hasOne(Order::class)->selectRaw('user_id, count(*) as count')
->groupBy('user_id');
}
//attribute
public function getOrdersCountAttribute()
{
return $this->ordersCountRelation->count ?? 0;
}
//Then accessed like:
$user = User::with('ordersCountRelation')->find($id);
$user->ordersCount; //return only count
Any help will be highly appreciated

Answer 1

there is no need for using hasManyThrough.
just use some relations and withCount method:
$admin->posts->withCount('comments')->get();
then you can access it with: $comments_count