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<?php
/**
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP(tm) Project
* @since 2.0.0
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Controller\Component;
use Cake\Controller\Component;
use Cake\Controller\ComponentRegistry;
use Cake\Datasource\Exception\PageOutOfBoundsException;
use Cake\Datasource\Paginator;
use Cake\Http\Exception\NotFoundException;
use InvalidArgumentException;
/**
* This component is used to handle automatic model data pagination. The primary way to use this
* component is to call the paginate() method. There is a convenience wrapper on Controller as well.
*
* ### Configuring pagination
*
* You configure pagination when calling paginate(). See that method for more details.
*
* @link https://book.cakephp.org/3.0/en/controllers/components/pagination.html
*/
class PaginatorComponent extends Component
{
/**
* Default pagination settings.
*
* When calling paginate() these settings will be merged with the configuration
* you provide.
*
* - `maxLimit` - The maximum limit users can choose to view. Defaults to 100
* - `limit` - The initial number of items per page. Defaults to 20.
* - `page` - The starting page, defaults to 1.
* - `whitelist` - A list of parameters users are allowed to set using request
* parameters. Modifying this list will allow users to have more influence
* over pagination, be careful with what you permit.
*
* @var array
*/
protected $_defaultConfig = [
'page' => 1,
'limit' => 20,
'maxLimit' => 100,
'whitelist' => ['limit', 'sort', 'page', 'direction']
];
/**
* Datasource paginator instance.
*
* @var \Cake\Datasource\Paginator
*/
protected $_paginator;
/**
* {@inheritDoc}
*/
public function __construct(ComponentRegistry $registry, array $config = [])
{
if (isset($config['paginator'])) {
if (!$config['paginator'] instanceof Paginator) {
throw new InvalidArgumentException('Paginator must be an instance of ' . Paginator::class);
}
$this->_paginator = $config['paginator'];
unset($config['paginator']);
} else {
$this->_paginator = new Paginator();
}
parent::__construct($registry, $config);
}
/**
* Events supported by this component.
*
* @return array
*/
public function implementedEvents()
{
return [];
}
/**
* Handles automatic pagination of model records.
*
* ### Configuring pagination
*
* When calling `paginate()` you can use the $settings parameter to pass in pagination settings.
* These settings are used to build the queries made and control other pagination settings.
*
* If your settings contain a key with the current table's alias. The data inside that key will be used.
* Otherwise the top level configuration will be used.
*
* ```
* $settings = [
* 'limit' => 20,
* 'maxLimit' => 100
* ];
* $results = $paginator->paginate($table, $settings);
* ```
*
* The above settings will be used to paginate any Table. You can configure Table specific settings by
* keying the settings with the Table alias.
*
* ```
* $settings = [
* 'Articles' => [
* 'limit' => 20,
* 'maxLimit' => 100
* ],
* 'Comments' => [ ... ]
* ];
* $results = $paginator->paginate($table, $settings);
* ```
*
* This would allow you to have different pagination settings for `Articles` and `Comments` tables.
*
* ### Controlling sort fields
*
* By default CakePHP will automatically allow sorting on any column on the table object being
* paginated. Often times you will want to allow sorting on either associated columns or calculated
* fields. In these cases you will need to define a whitelist of all the columns you wish to allow
* sorting on. You can define the whitelist in the `$settings` parameter:
*
* ```
* $settings = [
* 'Articles' => [
* 'finder' => 'custom',
* 'sortWhitelist' => ['title', 'author_id', 'comment_count'],
* ]
* ];
* ```
*
* Passing an empty array as whitelist disallows sorting altogether.
*
* ### Paginating with custom finders
*
* You can paginate with any find type defined on your table using the `finder` option.
*
* ```
* $settings = [
* 'Articles' => [
* 'finder' => 'popular'
* ]
* ];
* $results = $paginator->paginate($table, $settings);
* ```
*
* Would paginate using the `find('popular')` method.
*
* You can also pass an already created instance of a query to this method:
*
* ```
* $query = $this->Articles->find('popular')->matching('Tags', function ($q) {
* return $q->where(['name' => 'CakePHP'])
* });
* $results = $paginator->paginate($query);
* ```
*
* ### Scoping Request parameters
*
* By using request parameter scopes you can paginate multiple queries in the same controller action:
*
* ```
* $articles = $paginator->paginate($articlesQuery, ['scope' => 'articles']);
* $tags = $paginator->paginate($tagsQuery, ['scope' => 'tags']);
* ```
*
* Each of the above queries will use different query string parameter sets
* for pagination data. An example URL paginating both results would be:
*
* ```
* /dashboard?articles[page]=1&tags[page]=2
* ```
*
* @param \Cake\Datasource\RepositoryInterface|\Cake\Datasource\QueryInterface $object The table or query to paginate.
* @param array $settings The settings/configuration used for pagination.
* @return \Cake\Datasource\ResultSetInterface Query results
* @throws \Cake\Http\Exception\NotFoundException
*/
public function paginate($object, array $settings = [])
{
$request = $this->_registry->getController()->request;
try {
$results = $this->_paginator->paginate(
$object,
$request->getQueryParams(),
$settings
);
$this->_setPagingParams();
} catch (PageOutOfBoundsException $e) {
$this->_setPagingParams();
throw new NotFoundException(null, null, $e);
}
return $results;
}
/**
* Merges the various options that Pagination uses.
* Pulls settings together from the following places:
*
* - General pagination settings
* - Model specific settings.
* - Request parameters
*
* The result of this method is the aggregate of all the option sets combined together. You can change
* config value `whitelist` to modify which options/values can be set using request parameters.
*
* @param string $alias Model alias being paginated, if the general settings has a key with this value
* that key's settings will be used for pagination instead of the general ones.
* @param array $settings The settings to merge with the request data.
* @return array Array of merged options.
*/
public function mergeOptions($alias, $settings)
{
$request = $this->_registry->getController()->request;
return $this->_paginator->mergeOptions(
$request->getQueryParams(),
$this->_paginator->getDefaults($alias, $settings)
);
}
/**
* Set paginator instance.
*
* @param \Cake\Datasource\Paginator $paginator Paginator instance.
* @return self
*/
public function setPaginator(Paginator $paginator)
{
$this->_paginator = $paginator;
return $this;
}
/**
* Get paginator instance.
*
* @return \Cake\Datasource\Paginator
*/
public function getPaginator()
{
return $this->_paginator;
}
/**
* Set paging params to request instance.
*
* @return void
*/
protected function _setPagingParams()
{
$controller = $this->getController();
$request = $controller->getRequest();
$paging = $this->_paginator->getPagingParams() + (array)$request->getParam('paging', []);
$controller->setRequest($request->withParam('paging', $paging));
}
/**
* Proxy getting/setting config options to Paginator.
*
* @deprecated 3.5.0 use setConfig()/getConfig() instead.
* @param string|array|null $key The key to get/set, or a complete array of configs.
* @param mixed|null $value The value to set.
* @param bool $merge Whether to recursively merge or overwrite existing config, defaults to true.
* @return mixed Config value being read, or the object itself on write operations.
*/
public function config($key = null, $value = null, $merge = true)
{
deprecationWarning('PaginatorComponent::config() is deprecated. Use getConfig()/setConfig() instead.');
$return = $this->_paginator->config($key, $value, $merge);
if ($return instanceof Paginator) {
$return = $this;
}
return $return;
}
/**
* Proxy setting config options to Paginator.
*
* @param string|array $key The key to set, or a complete array of configs.
* @param mixed|null $value The value to set.
* @param bool $merge Whether to recursively merge or overwrite existing config, defaults to true.
* @return $this
*/
public function setConfig($key, $value = null, $merge = true)
{
$this->_paginator->setConfig($key, $value, $merge);
return $this;
}
/**
* Proxy getting config options to Paginator.
*
* @param string|null $key The key to get or null for the whole config.
* @param mixed $default The return value when the key does not exist.
* @return mixed Config value being read.
*/
public function getConfig($key = null, $default = null)
{
return $this->_paginator->getConfig($key, $default);
}
/**
* Proxy setting config options to Paginator.
*
* @param string|array $key The key to set, or a complete array of configs.
* @param mixed|null $value The value to set.
* @return $this
*/
public function configShallow($key, $value = null)
{
$this->_paginator->configShallow($key, $value = null);
return $this;
}
/**
* Proxy method calls to Paginator.
*
* @param string $method Method name.
* @param array $args Method arguments.
* @return mixed
*/
public function __call($method, $args)
{
return call_user_func_array([$this->_paginator, $method], $args);
}
}