Eloquent - Fetch, merge and paginate data from multiple models - php

Question

I'm working on an application where users have different types of events. Each event type has its own database table/Laravel model. Right now I'm performing multiple database queries to fetch the events from the tables. After that I merge them manually by using for-each loops and creating a uniform structure.
Because the code is really long, I give you guys an example code here:
$output = [];
$events1 = EventType1::where('user',$user_id)->get();
foreach ($events1 as $ev1) {
$output[] = [
"id" => $ev1->id,
"date" => $ev1->id,
"attribute3" => $ev1->attributeA
];
}
$events2 = EventType2::where('user',$user_id)->get();
foreach ($events2 as $ev2) {
$output[] = [
"id" => $ev2->id,
"date" => $ev2->id,
"attribute3" => $ev2->someOtherAttribute
];
}
// More fetches here....
// ...
// ...
usort($output, function ($a, $b) {
return strcmp($a["date"], $b["date"]);
});
return $output;
So right now I want to improve the performance by using Pagination. But the way I fetch the data, I don't think it will work?!
Can someone help me how to fetch, merge and paginate all the events the proper way?
Is there a way to union all the data using Eloquent?
Thanks

Answer 1

If you want with pagination you can follow this. I have used one of my projects for merging different model data as well as including pagination. If you don't need pagination just ignore pagination method calling part.
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Pagination\Paginator;
use Illuminate\Support\Collection;
public function events(){
$events1 = EventType1::where('user',$user_id)->get();
$events2 = EventType2::where('user',$user_id)->get();
$collection = new Collection();
$collection = $collection->merge($events1);
$collection = $collection->merge($events2);
$merge = $this->paginate($collection, $limit);
return $merge;
}
public function paginate($items, $perPage = 10, $page = null, $options = [])
{
$page = $page ?: (Paginator::resolveCurrentPage() ?: 1);
$items = $items instanceof Collection ? $items : Collection::make($items);
return new LengthAwarePaginator($items->forPage($page, $perPage), $items->count(), $perPage, $page, $options);
}