How can I paginate an array of objects in Laravel? - laravel-4

Question

I'm building an application using Laravel 4.2. I have a model for units and another for users and pivot table user_units. Every user in this application can select a unit and add it to his favorite list then he can publish this unit with his information as an ad.
I want to select all units published by all users
The user_units (pivot) table has the following columns:
id
user_id
unit_id
publish
adtype
addinfo
created_at
updated_at
With relations methods on models
public function users() {
return $this->belongsToMany('User', 'user_units')
->withPivot('id','publish', 'adtype', 'addinfo');
}
public function units() {
return $this->belongsToMany('Unit', 'user_units')
->withPivot('id','publish', 'adtype', 'addinfo');
}
My query to select all published units by all users
// Get all published units by users for sale.
$users = User::all();
$publishedSaleUnits = [];
foreach($users as $user){
$userUnits = $user->units()->orderBy('adtype', 'desc')->get();
if(count($userUnits)){
foreach($userUnits as $unit){
if($unit->pivot->publish == 1 && $unit->unit_purpose_id == 1){
if( $unit->pivot->adtype ){
//push all featured ads onto the beginning of array
array_unshift($publishedSaleUnits, $unit);
}else{
//push all normal ads onto the end of array
array_push($publishedSaleUnits, $unit);
}
}
}
}
}
Now I got the result but I can't use pagination with results because it's an array of objects.
So is there any better solution to get all published units by user with pagination?

Answer 1

according to this article
https://www.itsolutionstuff.com/post/how-to-create-pagination-from-array-in-laravelexample.html
you can paginate your array by creating a custom method and using LengthAwarePaginator
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Illuminate\Pagination\Paginator;
use Illuminate\Support\Collection;
use Illuminate\Pagination\LengthAwarePaginator;
class PaginationController extends Controller
{
public function index()
{
$myArray = [
['id'=>1, 'title'=>'Laravel CRUD'],
['id'=>2, 'title'=>'Laravel Ajax CRUD'],
['id'=>3, 'title'=>'Laravel CORS Middleware'],
];
$data = $this->paginate($myArray);
return view('paginate', compact('data'));
}
public function paginate($items, $perPage = 5, $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);
}
}

Answer 2

Your approach to query the data is extremely inefficient. Fetch your data in one query. Nested traversing is not only hard to read but also a performance killer.
To the pagination problem:
Laravel provides a Pagignator Factory. With it you will be able to build your own Paginator with your own data.
It's as easy as
$units = Paginator::make($unit, count($unit), 10);
if you're using the Facade. Otherwise Illuminate\Pagination\Factory is the class you are looking for.

Answer 3

You can try my code with your own array,
$page = isset($request->page) ? $request->page : 1; // Get the page=1 from the url
$perPage = $pagination_num; // Number of items per page
$offset = ($page * $perPage) - $perPage;
$entries = new LengthAwarePaginator(
array_slice($contact_list, $offset, $perPage, true),
count($contact_list), // Total items
$perPage, // Items per page
$page, // Current page
['path' => $request->url(), 'query' => $request->query()] // We
need this so we can keep all old query parameters from the url
);

Answer 4

I got a better solution to paginate array result and I found the answer here
Paginator::make function we need to pass only the required values instead of all values. Because paginator::make function simply displays the data send to it. To send the correct offset paginated data to the paginator::make, the following method should be followed
$perPage = 5;
$page = Input::get('page', 1);
if ($page > count($publishedSaleUnits) or $page < 1) { $page = 1; }
$offset = ($page * $perPage) - $perPage;
$perPageUnits = array_slice($publishedSaleUnits,$offset,$perPage);
$pagination = Paginator::make($perPageUnits, count($publishedSaleUnits), $perPage);

Answer 5

this code work for me on laravel 8
use Illuminate\Pagination\Paginator;
use Illuminate\Support\Collection;
public function paginate($items, $perPage = 5, $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);
}
according to this refrence https://www.itsolutionstuff.com/post/how-to-create-pagination-from-array-in-laravelexample.html