Laravel 5.7 Database Design Layout / Average from Collection - laravel

Question

I have a situation where each Order can have Feedback. In case the product is physical, the Feedback can have many packaging_feedbacks. The packaging_feedbacks are supposed to be a relation to the packaging_feedback_details.
Feedback Model
public function packagingFeedbacks()
{
return $this->hasManyThrough('App\PackagingFeedbackDetail', 'App\PackagingFeedback',
'feedback_id', 'id', 'id', 'user_selection');
}
packaging_feedback_details
id|type_id(used to group the "names" for each feedback option)|name
1 0 well packed
2 0 bad packaging
3 1 fast shipping
4 1 express delivery
packaging_feedbacks
id|feedback_id|user_selection (pointing to the ID of packaging_feedback_details)
1 1 2
2 1 6
3 1 7
4 1 12
5 1 15
6 1 17
7 2 1
8 2 6
9 2 7
10 2 12
11 2 15
12 2 17
13 3 1
14 3 6
15 3 7
16 3 12
17 3 15
18 3 17
Now I would like to be able to get the average selection of the users for a physical product. I started by using:
$result = Product::with('userFeedbacks.packagingFeedbacks')->where('id', 1)->first();
$collection = collect();
foreach ($result->userFeedbacks as $key) {
foreach ($key->packagingFeedbacks as $skey) {
$collection->push($skey);
}
}
foreach ($collection->groupBy('type_id') as $key) {
echo($key->average('type_id'));
}
But it returns not the average id since it will calculate the average not the way I need it to calculate. Is there some better way, because I think it's not the cleverest way to do so. Is my database design, in general, the "best" way to handle this?

Answer 1

The type of average you're looking for here is mode. Laravel's collection instances have a mode() method which was introduced in 5.2 which when provide a key returns an array containing the highest occurring value for that key.
If I have understood your question correctly this should give you what you're after:
$result->userFeedbacks
->flatMap->packagingFeedbacks
->groupBy('type_id')
->map->mode('id');
The above is taking advantage of flatMap() and higher order messages() on collections.