Sections

Paginación


Overview

The process of pagination takes place when we need to present big groups of arbitrary data gradually. Phalcon\Paginator offers a fast and convenient way to split these sets of data into browsable pages.

Data Adapters

This component makes use of adapters to encapsulate different sources of data:

Adaptador Descripción
Phalcon\Paginator\Adapter\NativeArray Usa un array PHP como origen de datos
Phalcon\Paginator\Adapter\Model Use a Phalcon\Mvc\Model\Resultset object as source data. Como PDO no admite cursores desplazables, este adaptador no se debe usar para paginar una gran cantidad de registros
Phalcon\Paginator\Adapter\QueryBuilder Use a Phalcon\Mvc\Model\Query\Builder object as source data

Factory

New Instance

You can use the Pagination Factory class to instantiate a new paginator object:

<?php

use Phalcon\Paginator\PaginatorFactory;

$builder = $this
    ->modelsManager
    ->createBuilder()
    ->columns('id, name')
    ->from(Users::class)
    ->orderBy('name')
;

$options = [
    'builder' => $builder,
    'limit'   => 20,
    'page'    => 1,
];

$factory   = new PaginatorFactory();
$paginator = $factory->newInstance('queryBuilder');

Load

Loads Paginator Adapter class using adapter option. The configuration passed can be an array or a Phalcon\Config object with the necessary entries for the class to be instantiated.

<?php

use Phalcon\Paginator\PaginatorFactory;

$builder = $this
    ->modelsManager
    ->createBuilder()
    ->columns('id, lastName, firstName')
    ->from(Users::class)
    ->orderBy('name')
;

$options = [
    'builder' => $builder,
    'limit'   => 20,
    'page'    => 1,
    'adapter' => 'queryBuilder',
];

$paginator = (new PaginatorFactory())->load($options);

Ejemplos

In the example below, the paginator will use the result of a query from a model as its source data, and limit the displayed data to 10 records per page:

<?php

use Phalcon\Paginator\Adapter\Model as PaginatorModel;

// Current page to show
// In a controller/component this can be:
// $this->request->getQuery('page', 'int'); // GET
// $this->request->getPost('page', 'int'); // POST
$currentPage = (int) $_GET['page'];

// The data set to paginate
$robots = Users::find();

// Create a Model paginator, show 10 rows by page starting from $currentPage
$paginator = new PaginatorModel(
    [
        'data'  => $robots,
        'limit' => 10,
        'page'  => $currentPage,
    ]
);

// Get the paginated results
$page = $paginator->paginate();

The $currentPage variable controls the page to be displayed. The $paginator->paginate() returns a $page object that contains the paginated data. It can be used for generating the pagination:

<table>
    <tr>
        <th>Id</th>
        <th>Active</th>
        <th>Last Name</th>
        <th>First Name</th>
    </tr>
    <?php foreach ($page->items as $item) { ?>
    <tr>
        <td><?php echo $item->id; ?></td>
        <td><?php echo ($item->active) ? 'Y' : 'N'; ?></td>
        <td><?php echo $item->lastName; ?></td>
        <td><?php echo $item->firstName; ?></td>
    </tr>
    <?php } ?>
</table>

The $page object also contains navigation data:

<a href="/users/list">First</a>
<a href="/users/list?page=<?= $page->previous; ?>">Previous</a>
<a href="/users/list?page=<?= $page->next; ?>">Next</a>
<a href="/users/list?page=<?= $page->last; ?>">Last</a>

<?php echo "You are in page {$page->current}  of {$page->total_pages}"; ?>

Using Adapters

Factory

You can instantiate a Paginator class using the AdapterFactory.

<?php

use Phalcon\Paginator\AdapterFactory;

$factory = new AdapterFactory();

// Passing a resultset as data
$options = [
   'data'  => Products::find(),
   'limit' => 10,
   'page'  => $currentPage,
];

$paginator = $factory->newInstance('model', $options);

// Passing an array as data
$options = [
    'data'  => [
        ['id' => 1, 'name' => 'Artichoke'],
        ['id' => 2, 'name' => 'Carrots'],
        ['id' => 3, 'name' => 'Beet'],
        ['id' => 4, 'name' => 'Lettuce'],
        ['id' => 5, 'name' => ''],
    ],
    'limit' => 2,
    'page'  => $currentPage,
];
$paginator = $factory->newInstance('nativeArray', $options);

// Passing a QueryBuilder as data

$builder = $this
    ->modelsManager
    ->createBuilder()
    ->columns('id, name')
    ->from('Robots')
    ->orderBy('name');
$options = [
    'builder' => $builder,
    'limit'   => 20,
    'page'    => 1,
];

$paginator = $factory->newInstance('queryBuilder', $options);

Individual classes

An example of the source data that must be used for each adapter:

<?php

use Phalcon\Paginator\Adapter\Model as PaginatorModel;
use Phalcon\Paginator\Adapter\NativeArray as PaginatorArray;
use Phalcon\Paginator\Adapter\QueryBuilder as PaginatorQueryBuilder;

// Passing a resultset as data
$paginator = new PaginatorModel(
    [
        'data'  => Products::find(),
        'limit' => 10,
        'page'  => $currentPage,
    ]
);

// Passing an array as data
$paginator = new PaginatorArray(
    [
        'data'  => [
            ['id' => 1, 'name' => 'Artichoke'],
            ['id' => 2, 'name' => 'Carrots'],
            ['id' => 3, 'name' => 'Beet'],
            ['id' => 4, 'name' => 'Lettuce'],
            ['id' => 5, 'name' => ''],
        ],
        'limit' => 2,
        'page'  => $currentPage,
    ]
);

// Passing a QueryBuilder as data

$builder = $this->modelsManager->createBuilder()
    ->columns('id, name')
    ->from('Robots')
    ->orderBy('name');

$paginator = new PaginatorQueryBuilder(
    [
        'builder' => $builder,
        'limit'   => 20,
        'page'    => 1,
    ]
);

Page Attributes

The $page object has the following attributes:

Atributos Descripción
items El conjunto de registros o elementos a mostrar en la página actual
current Número de página actual
previous Número de página anterior a la actual
next Número de página siguiente a la actual
last Número de la última página
total_items The number of items in the source data

Implementando sus propios adaptadores

The Phalcon\Paginator\AdapterInterface interface must be implemented in order to create your own paginator adapters or extend the existing ones:

<?php

use Phalcon\Paginator\AdapterInterface as PaginatorInterface;
use Phalcon\Paginator\RepositoryInterface;

class MyPaginator implements PaginatorInterface
{
    /**
     * Get current rows limit
     */
    public function getLimit(): int;

    /**
     * Returns a slice of the resultset to show in the pagination
     */
    public function paginate(): RepositoryInterface;

    /**
     * Set the current page number
     */
    public function setCurrentPage(int $page);

    /**
     * Set current rows limit
     */
    public function setLimit(int $limit);
}