Laravel reverse a collection hierarchy - php

Question

Say I have a collection that looks like this:
$subscriptions = collect([
[
"id" => 1,
"event" => "FormCompleted",
"subscriber" => [
"id" => 2929,
"name" => "Adam",
"email" => "adam#dude.com"
]
],
[
"id" => 3,
"event" => "FormCompleted",
"subscriber" => [
"id" => 1928,
"name" => "Pope",
"email" => "pope#dude.com"
],
],
[
"id" => 4,
"event" => "StatusChanged",
"subscriber" => [
"id" => 2929,
"name" => "Adam",
"email" => "adam#dude.com"
]
]
]);
This shows a list of events with its subscriber. What I want is to re-group this to show a list of subscribers with its events. How do I group these results to get a result like this?
[
[
"id" => 2929,
"name" => "Adam",
"email" => "adam#dude.com",
"subscriptions" => [
[
"id" => 1,
"event" => "FormCompleted"
],
[
"id" => 4,
"event" => "StatusChanged"
],
]
],
[
"id" => 1928,
"name" => "Pope",
"email" => "pope#dude.com",
"subscriptions" => [
[
"id" => 3,
"event" => "FormCompleted"
]
]
]
]
Here is my code... which works, but it is very messy and I feel like there is a better way to do it...
$subscribers = $subscriptions->groupBy('subscriber.id')
->map(function($group) {
$subscriber = $group[0]->subscriber;
$subscriber['subscriptions'] = $group->map(function($subscription) {
unset($subscription['subscriber']);
return $subscription;
});
return $subscriber;
})->values();

Answer 1

I think like that this should return you all subscribers who have groups, so guarantees return not empty subscribers with events
More details you can read this in documention
return Subscriber::has('groups')->get()->groupBy('id');