Paginate for a collection, Laravel - laravel

Question

I try to add some new values to each user from foreach, but because I use get, now I can't use paginate on response, but I also need to add that values to each user. Any ideas?
public function statistics()
{
$users = User::select(['id', 'name'])->get();
foreach ($users as $key => $user) {
$history = AnswerHistory::where('user_id', '=', $user->id)->get();
$user->total_votes = count($history);
$user->total_time = gmdate("H:i:s", ($history->sum('answer_time')));
}
return response()->json($users);
}

Answer 1

what you want is not possible in laravel by default, however there are a few things you can do.
Solution one you can return paginator first and then modify the collection.
$users = User::select(['id', 'name'])->paginate(4)->toArray();
$users['data'] = array_map(function ($user) {
$history = AnswerHistory::where('user_id', '=', $user->id)->get();
$user->total_votes = count($history);
$user->total_time = gmdate("H:i:s", ($history->sum('answer_time')));
return $user;
}, $users['data']);
return $users;
Solution two The macro way. If you prefer, add the Collection macro to a Service Provider. That way you can call paginate() on any collection:
See AppServiceProvider.php for a sample implementation.
public function boot()
{
Collection::macro('paginate', function ($perPage, $total = null, $page = null, $pageName = 'page') {
$page = $page ?: LengthAwarePaginator::resolveCurrentPage($pageName);
return new LengthAwarePaginator(
$this->forPage($page, $perPage),
$total ?: $this->count(),
$perPage,
$page,
[
'path' => LengthAwarePaginator::resolveCurrentPath(),
'pageName' => $pageName,
]
);
});
}
and then your code will be like this
$users = User::select(['id', 'name'])->get();
foreach ($users as $key => $user) {
$history = AnswerHistory::where('user_id', '=', $user->id)->get();
$user->total_votes = count($history);
$user->total_time = gmdate("H:i:s", ($history->sum('answer_time')));
}
return response()->json($users->paginate(4));
Solution three The subclass way. Where you want a "pageable" collection that is distinct from the standard Illuminate\Support\Collection, implement a copy of Collection.php in your application and simply replace your use Illuminate\Support\Collection statements at the top of your dependent files with use App\Support\Collection:
<?php
namespace App\Support;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Collection as BaseCollection;
class Collection extends BaseCollection
{
public function paginate($perPage, $total = null, $page = null, $pageName = 'page')
{
$page = $page ?: LengthAwarePaginator::resolveCurrentPage($pageName);
return new LengthAwarePaginator(
$this->forPage($page, $perPage),
$total ?: $this->count(),
$perPage,
$page,
[
'path' => LengthAwarePaginator::resolveCurrentPath(),
'pageName' => $pageName,
]
);
}
}
and your code will be like this
// use Illuminate\Support\Collection
use App\Support\Collection;
$users = User::select(['id', 'name'])->get();
foreach ($users as $key => $user) {
$history = AnswerHistory::where('user_id', '=', $user->id)->get();
$user->total_votes = count($history);
$user->total_time = gmdate("H:i:s", ($history->sum('answer_time')));
}
return response()->json((new Collection($users))->paginate(4);

Answer 2

According to your post, User has many AnswerHistory. You can build relationship between them.
So getting the total_votes and total_time by withCount:
$users = User::withCount('answerHistories AS total_votes')
->withCount(['answerHistories AS total_time' => function($query) {
$query->select(DB::raw("SUM(answer_time)"));
}])->paginate(10);
And you can get the pagination datas by getCollection, and change the datas inside:
$users->getCollection()->transform(function ($data) {
$data->total_time = gmdate('H:i:s', $data->total_time);
return $data;
});

Answer 3

You can create pagination by yourself look to this Laravel doc https://laravel.com/docs/7.x/pagination#manually-creating-a-paginator.
I will suggest to use LengthAwarePaginator
Here is some code example with array
// creating pagination
$offset = max(0, ($page - 1) * $perPage);
$resultArray = array_slice($result, $offset, $perPage);
$paginator = new LengthAwarePaginator($resultArray, count($result), $perPage, $page);
$paginator->setPath(url()->current());
$paginator->appends(['per_page' => $perPage]);
return response()->json([
'message' => 'Success',
'data' => $paginator
]);
But I think your case have better "good" solution, you can load AnswerHistory with hasMany Laravel relation and with function.