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02c9dda9a7
Having maxLimit infer what it should be based on limit was not a very transparent default behavior. The documentation states that maxLimit will default to 100, but the code would default it to 'limit' if set. This created confusing behavior when only one setting was defined. Refs #5973
429 lines
13 KiB
PHP
429 lines
13 KiB
PHP
<?php
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/**
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* Paginator Component
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.Controller.Component
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* @since CakePHP(tm) v 2.0
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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App::uses('Component', 'Controller');
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App::uses('Hash', 'Utility');
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/**
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* This component is used to handle automatic model data pagination. The primary way to use this
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* component is to call the paginate() method. There is a convenience wrapper on Controller as well.
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*
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* ### Configuring pagination
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*
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* You configure pagination using the PaginatorComponent::$settings. This allows you to configure
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* the default pagination behavior in general or for a specific model. General settings are used when there
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* are no specific model configuration, or the model you are paginating does not have specific settings.
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*
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* ```
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* $this->Paginator->settings = array(
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* 'limit' => 20,
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* 'maxLimit' => 100
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* );
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* ```
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*
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* The above settings will be used to paginate any model. You can configure model specific settings by
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* keying the settings with the model name.
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*
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* ```
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* $this->Paginator->settings = array(
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* 'Post' => array(
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* 'limit' => 20,
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* 'maxLimit' => 100
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* ),
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* 'Comment' => array( ... )
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* );
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* ```
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*
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* This would allow you to have different pagination settings for `Comment` and `Post` models.
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*
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* #### Paginating with custom finders
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*
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* You can paginate with any find type defined on your model using the `findType` option.
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*
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* ```
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* $this->Paginator->settings = array(
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* 'Post' => array(
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* 'findType' => 'popular'
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* )
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* );
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* ```
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*
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* Would paginate using the `find('popular')` method.
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*
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* @package Cake.Controller.Component
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* @link http://book.cakephp.org/2.0/en/core-libraries/components/pagination.html
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*/
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class PaginatorComponent extends Component {
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/**
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* Pagination settings. These settings control pagination at a general level.
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* You can also define sub arrays for pagination settings for specific models.
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*
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* - `maxLimit` The maximum limit users can choose to view. Defaults to 100
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* - `limit` The initial number of items per page. Defaults to 20.
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* - `page` The starting page, defaults to 1.
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* - `paramType` What type of parameters you want pagination to use?
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* - `named` Use named parameters / routed parameters.
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* - `querystring` Use query string parameters.
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*
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* @var array
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*/
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public $settings = array(
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'page' => 1,
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'limit' => 20,
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'maxLimit' => 100,
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'paramType' => 'named'
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);
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/**
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* A list of parameters users are allowed to set using request parameters. Modifying
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* this list will allow users to have more influence over pagination,
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* be careful with what you permit.
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*
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* @var array
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*/
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public $whitelist = array(
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'limit', 'sort', 'page', 'direction'
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);
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/**
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* Constructor
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*
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* @param ComponentCollection $collection A ComponentCollection this component can use to lazy load its components
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* @param array $settings Array of configuration settings.
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*/
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public function __construct(ComponentCollection $collection, $settings = array()) {
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$settings = array_merge($this->settings, (array)$settings);
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$this->Controller = $collection->getController();
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parent::__construct($collection, $settings);
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}
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/**
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* Handles automatic pagination of model records.
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*
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* @param Model|string $object Model to paginate (e.g: model instance, or 'Model', or 'Model.InnerModel')
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* @param string|array $scope Additional find conditions to use while paginating
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* @param array $whitelist List of allowed fields for ordering. This allows you to prevent ordering
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* on non-indexed, or undesirable columns. See PaginatorComponent::validateSort() for additional details
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* on how the whitelisting and sort field validation works.
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* @return array Model query results
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* @throws MissingModelException
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* @throws NotFoundException
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*/
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public function paginate($object = null, $scope = array(), $whitelist = array()) {
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if (is_array($object)) {
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$whitelist = $scope;
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$scope = $object;
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$object = null;
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}
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$object = $this->_getObject($object);
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if (!is_object($object)) {
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throw new MissingModelException($object);
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}
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$options = $this->mergeOptions($object->alias);
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$options = $this->validateSort($object, $options, $whitelist);
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$options = $this->checkLimit($options);
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$conditions = $fields = $order = $limit = $page = $recursive = null;
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if (!isset($options['conditions'])) {
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$options['conditions'] = array();
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}
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$type = 'all';
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if (isset($options[0])) {
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$type = $options[0];
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unset($options[0]);
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}
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extract($options);
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if (is_array($scope) && !empty($scope)) {
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$conditions = array_merge($conditions, $scope);
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} elseif (is_string($scope)) {
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$conditions = array($conditions, $scope);
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}
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if ($recursive === null) {
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$recursive = $object->recursive;
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}
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$extra = array_diff_key($options, compact(
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'conditions', 'fields', 'order', 'limit', 'page', 'recursive'
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));
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if (!empty($extra['findType'])) {
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$type = $extra['findType'];
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unset($extra['findType']);
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}
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if ($type !== 'all') {
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$extra['type'] = $type;
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}
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if ((int)$page < 1) {
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$page = 1;
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}
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$page = $options['page'] = (int)$page;
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if ($object->hasMethod('paginate')) {
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$results = $object->paginate(
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$conditions, $fields, $order, $limit, $page, $recursive, $extra
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);
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} else {
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$parameters = compact('conditions', 'fields', 'order', 'limit', 'page');
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if ($recursive != $object->recursive) {
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$parameters['recursive'] = $recursive;
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}
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$results = $object->find($type, array_merge($parameters, $extra));
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}
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$defaults = $this->getDefaults($object->alias);
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unset($defaults[0]);
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if (!$results) {
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$count = 0;
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} elseif ($object->hasMethod('paginateCount')) {
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$count = $object->paginateCount($conditions, $recursive, $extra);
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} elseif ($page === 1 && count($results) < $limit) {
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$count = count($results);
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} else {
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$parameters = compact('conditions');
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if ($recursive != $object->recursive) {
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$parameters['recursive'] = $recursive;
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}
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$count = $object->find('count', array_merge($parameters, $extra));
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}
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$pageCount = (int)ceil($count / $limit);
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$requestedPage = $page;
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$page = max(min($page, $pageCount), 1);
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$paging = array(
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'page' => $page,
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'current' => count($results),
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'count' => $count,
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'prevPage' => ($page > 1),
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'nextPage' => ($count > ($page * $limit)),
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'pageCount' => $pageCount,
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'order' => $order,
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'limit' => $limit,
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'options' => Hash::diff($options, $defaults),
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'paramType' => $options['paramType']
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);
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if (!isset($this->Controller->request['paging'])) {
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$this->Controller->request['paging'] = array();
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}
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$this->Controller->request['paging'] = array_merge(
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(array)$this->Controller->request['paging'],
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array($object->alias => $paging)
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);
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if ($requestedPage > $page) {
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throw new NotFoundException();
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}
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if (!in_array('Paginator', $this->Controller->helpers) &&
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!array_key_exists('Paginator', $this->Controller->helpers)
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) {
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$this->Controller->helpers[] = 'Paginator';
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}
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return $results;
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}
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/**
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* Get the object pagination will occur on.
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*
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* @param string|Model $object The object you are looking for.
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* @return mixed The model object to paginate on.
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*/
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protected function _getObject($object) {
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if (is_string($object)) {
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$assoc = null;
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if (strpos($object, '.') !== false) {
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list($object, $assoc) = pluginSplit($object);
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}
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if ($assoc && isset($this->Controller->{$object}->{$assoc})) {
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return $this->Controller->{$object}->{$assoc};
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}
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if ($assoc && isset($this->Controller->{$this->Controller->modelClass}->{$assoc})) {
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return $this->Controller->{$this->Controller->modelClass}->{$assoc};
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}
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if (isset($this->Controller->{$object})) {
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return $this->Controller->{$object};
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}
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if (isset($this->Controller->{$this->Controller->modelClass}->{$object})) {
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return $this->Controller->{$this->Controller->modelClass}->{$object};
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}
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}
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if (empty($object) || $object === null) {
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if (isset($this->Controller->{$this->Controller->modelClass})) {
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return $this->Controller->{$this->Controller->modelClass};
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}
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$className = null;
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$name = $this->Controller->uses[0];
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if (strpos($this->Controller->uses[0], '.') !== false) {
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list($name, $className) = explode('.', $this->Controller->uses[0]);
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}
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if ($className) {
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return $this->Controller->{$className};
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}
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return $this->Controller->{$name};
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}
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return $object;
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}
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/**
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* Merges the various options that Pagination uses.
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* Pulls settings together from the following places:
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*
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* - General pagination settings
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* - Model specific settings.
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* - Request parameters
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*
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* The result of this method is the aggregate of all the option sets combined together. You can change
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* PaginatorComponent::$whitelist to modify which options/values can be set using request parameters.
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*
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* @param string $alias Model alias being paginated, if the general settings has a key with this value
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* that key's settings will be used for pagination instead of the general ones.
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* @return array Array of merged options.
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*/
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public function mergeOptions($alias) {
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$defaults = $this->getDefaults($alias);
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switch ($defaults['paramType']) {
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case 'named':
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$request = $this->Controller->request->params['named'];
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break;
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case 'querystring':
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$request = $this->Controller->request->query;
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break;
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}
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$request = array_intersect_key($request, array_flip($this->whitelist));
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return array_merge($defaults, $request);
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}
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/**
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* Get the default settings for a $model. If there are no settings for a specific model, the general settings
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* will be used.
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*
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* @param string $alias Model name to get default settings for.
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* @return array An array of pagination defaults for a model, or the general settings.
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*/
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public function getDefaults($alias) {
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$defaults = $this->settings;
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if (isset($this->settings[$alias])) {
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$defaults = $this->settings[$alias];
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}
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$defaults += array(
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'page' => 1,
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'limit' => 20,
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'maxLimit' => 100,
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'paramType' => 'named'
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);
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return $defaults;
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}
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/**
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* Validate that the desired sorting can be performed on the $object. Only fields or
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* virtualFields can be sorted on. The direction param will also be sanitized. Lastly
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* sort + direction keys will be converted into the model friendly order key.
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*
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* You can use the whitelist parameter to control which columns/fields are available for sorting.
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* This helps prevent users from ordering large result sets on un-indexed values.
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*
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* Any columns listed in the sort whitelist will be implicitly trusted. You can use this to sort
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* on synthetic columns, or columns added in custom find operations that may not exist in the schema.
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*
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* @param Model $object The model being paginated.
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* @param array $options The pagination options being used for this request.
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* @param array $whitelist The list of columns that can be used for sorting. If empty all keys are allowed.
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* @return array An array of options with sort + direction removed and replaced with order if possible.
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*/
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public function validateSort(Model $object, array $options, array $whitelist = array()) {
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if (empty($options['order']) && is_array($object->order)) {
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$options['order'] = $object->order;
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}
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if (isset($options['sort'])) {
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$direction = null;
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if (isset($options['direction'])) {
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$direction = strtolower($options['direction']);
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}
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if (!in_array($direction, array('asc', 'desc'))) {
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$direction = 'asc';
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}
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$options['order'] = array($options['sort'] => $direction);
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}
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if (!empty($whitelist) && isset($options['order']) && is_array($options['order'])) {
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$field = key($options['order']);
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$inWhitelist = in_array($field, $whitelist, true);
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if (!$inWhitelist) {
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$options['order'] = null;
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}
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return $options;
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}
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if (!empty($options['order']) && is_array($options['order'])) {
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$order = array();
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foreach ($options['order'] as $key => $value) {
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if (is_int($key)) {
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$key = $value;
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$value = 'asc';
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}
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$field = $key;
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$alias = $object->alias;
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if (strpos($key, '.') !== false) {
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list($alias, $field) = explode('.', $key);
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}
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$correctAlias = ($object->alias === $alias);
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if ($correctAlias && $object->hasField($field)) {
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$order[$object->alias . '.' . $field] = $value;
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} elseif ($correctAlias && $object->hasField($key, true)) {
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$order[$field] = $value;
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} elseif (isset($object->{$alias}) && $object->{$alias}->hasField($field, true)) {
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$order[$alias . '.' . $field] = $value;
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}
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}
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$options['order'] = $order;
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}
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return $options;
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}
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/**
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* Check the limit parameter and ensure its within the maxLimit bounds.
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*
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* @param array $options An array of options with a limit key to be checked.
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* @return array An array of options for pagination
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*/
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public function checkLimit(array $options) {
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$options['limit'] = (int)$options['limit'];
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if (empty($options['limit']) || $options['limit'] < 1) {
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$options['limit'] = 1;
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}
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$options['limit'] = min($options['limit'], $options['maxLimit']);
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return $options;
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}
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}
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