cakephp：扩展模型类以覆盖分页方法

Question

我花了最近两天的时间寻找解决cakephp中分页问题的方法。

简而言之，我需要针对同一模型使用不同的分页方法。索引操作将使用默认方法，而视图操作将使用该方法和自定义查询。

基于OOP的继承概念，我认为解决方案是扩展我的模型并覆盖扩展模型上的分页方法。因此，我可以从控制器调用索引操作的默认分页方法和视图操作的自定义方法。

问题是：我如何扩展我的模型类？会这个意思吗？

这是我的模特：

<?php
class Communication extends AppModel {

var $name = 'Communication';
var $displayField = 'title';

//The Associations below have been created with all possible keys, those that are not needed can be removed

var $hasMany = array(
    'Interaction' => array(
        'className' => 'Interaction',
        'foreignKey' => 'communication_id',
        'dependent' => false,
        'conditions' => '',
        'fields' => '',
        'order' => '',
        'limit' => '',
        'offset' => '',
        'exclusive' => '',
        'finderQuery' => '',
        'counterQuery' => ''
    ),
    'Star' => array(
        'className' => 'Star',
        'foreignKey' => 'communication_id',
        'dependent' => false,
        'conditions' => '',
        'fields' => '',
        'order' => '',
        'limit' => '',
        'offset' => '',
        'exclusive' => '',
        'finderQuery' => '',
        'counterQuery' => ''
    )
);

var $hasAndBelongsToMany = array(
    'Document' => array(
        'className' => 'Document',
        'joinTable' => 'communications_documents',
        'foreignKey' => 'communication_id',
        'associationForeignKey' => 'document_id',
        'unique' => true,
        'conditions' => '',
        'fields' => '',
        'order' => '',
        'limit' => '',
        'offset' => '',
        'finderQuery' => '',
        'deleteQuery' => '',
        'insertQuery' => ''
    ),
    'Event' => array(
        'className' => 'Event',
        'joinTable' => 'communications_events',
        'foreignKey' => 'communication_id',
        'associationForeignKey' => 'event_id',
        'unique' => true,
        'conditions' => '',
        'fields' => '',
        'order' => '',
        'limit' => '',
        'offset' => '',
        'finderQuery' => '',
        'deleteQuery' => '',
        'insertQuery' => ''
    ),
    'Meeting' => array(
        'className' => 'Meeting',
        'joinTable' => 'communications_meetings',
        'foreignKey' => 'communication_id',
        'associationForeignKey' => 'meeting_id',
        'unique' => true,
        'conditions' => '',
        'fields' => '',
        'order' => 'date_create DESC',
        'limit' => '',
        'offset' => '',
        'finderQuery' => '',
        'deleteQuery' => '',
        'insertQuery' => ''
    ),
    'User' => array(
        'className' => 'User',
        'joinTable' => 'communications_users',
        'foreignKey' => 'communication_id',
        'associationForeignKey' => 'user_id',
        'unique' => true,
        'conditions' => '',
        'fields' => '',
        'order' => 'name',
        'limit' => '',
        'offset' => '',
        'finderQuery' => '',
        'deleteQuery' => '',
        'insertQuery' => ''
    )
);

function getComInfos($id) {

    $this->unbindModel(array('hasAndBelongsToMany'=>array('Document','Event','Meeting')));
    $this->unbindModel(array('hasMany'=>array('Star','Interaction')));
    $communication_infos = $this->read(null, $id);

    //debug($communication_infos);

    return $communication_infos;

}

function getComLinks($id) {

    $communication_links = $this->query("
    SELECT 'documents' AS 'type', 'D' AS 'marker', d.id AS id, d.date_create AS date, du.user_id AS info_aux, d.title AS title, d.desc AS content 
    FROM communications_documents AS cd
    JOIN documents AS d ON d.id = cd.document_id
    JOIN documents_users AS du ON du.document_id = d.id
    WHERE cd.communication_id = ".$id."

    UNION

    SELECT 'events' AS 'type', 'E' AS 'marker', e.id AS id, e.date_create AS date, e.institution AS info_aux, e.title AS title, e.desc AS content
    FROM communications_events AS ce
    JOIN events AS e ON e.id = ce.event_id
    WHERE ce.communication_id =".$id."

    UNION

    SELECT 'meetings' AS 'type', 'R' AS 'marker', m.id AS id, m.date_create AS date, m.site AS info_aux, m.title AS title, m.desc AS content
    FROM communications_meetings AS cm
    JOIN meetings AS m ON m.id = cm.meeting_id
    WHERE cm.communication_id =".$id."

    UNION

    SELECT 'interactions' AS 'type', 'C' AS 'marker', i.id AS id, i.date_create AS date, i.user_id AS info_aux, i.title AS title, i.content AS content
    FROM interactions AS i
    WHERE i.communication_id =".$id."

    ORDER BY date DESC
    ");

    //debug($communication_links);

    return $communication_links;

}

}

这是我的两个自定义分页方法，我只需要使用视图操作：

function paginate($conditions, $fields, $order, $limit, $page = 1, $recursive = null, $extra = array()) {

    $recursive = -1;
    return $this->query("
    SELECT 'documents' AS 'type', 'D' AS 'marker', d.id AS id, d.date_create AS date, du.user_id AS info_aux, d.title AS title, d.desc AS content 
    FROM communications_documents AS cd
    JOIN documents AS d ON d.id = cd.document_id
    JOIN documents_users AS du ON du.document_id = d.id
    WHERE cd.communication_id = 137

    UNION

    SELECT 'events' AS 'type', 'E' AS 'marker', e.id AS id, e.date_create AS date, e.institution AS info_aux, e.title AS title, e.desc AS content
    FROM communications_events AS ce
    JOIN events AS e ON e.id = ce.event_id
    WHERE ce.communication_id =137

    UNION

    SELECT 'meetings' AS 'type', 'R' AS 'marker', m.id AS id, m.date_create AS date, m.site AS info_aux, m.title AS title, m.desc AS content
    FROM communications_meetings AS cm
    JOIN meetings AS m ON m.id = cm.meeting_id
    WHERE cm.communication_id = 137

    UNION

    SELECT 'interactions' AS 'type', 'C' AS 'marker', i.id AS id, i.date_create AS date, i.user_id AS info_aux, i.title AS title, i.content AS content
    FROM interactions AS i
    WHERE i.communication_id = 137

    ORDER BY date DESC
    LIMIT ".(($page-1)*$limit).", ".$limit);

}

function paginateCount($conditions = null, $recursive = 0, $extra = array()) {
    $sql = "
    SELECT 'documents' AS 'type', 'D' AS 'marker', d.id AS id, d.date_create AS date, du.user_id AS info_aux, d.title AS title, d.desc AS content 
    FROM communications_documents AS cd
    JOIN documents AS d ON d.id = cd.document_id
    JOIN documents_users AS du ON du.document_id = d.id
    WHERE cd.communication_id = 137

    UNION

    SELECT 'events' AS 'type', 'E' AS 'marker', e.id AS id, e.date_create AS date, e.institution AS info_aux, e.title AS title, e.desc AS content
    FROM communications_events AS ce
    JOIN events AS e ON e.id = ce.event_id
    WHERE ce.communication_id = 137

    UNION

    SELECT 'meetings' AS 'type', 'R' AS 'marker', m.id AS id, m.date_create AS date, m.site AS info_aux, m.title AS title, m.desc AS content
    FROM communications_meetings AS cm
    JOIN meetings AS m ON m.id = cm.meeting_id
    WHERE cm.communication_id = 137

    UNION

    SELECT 'interactions' AS 'type', 'C' AS 'marker', i.id AS id, i.date_create AS date, i.user_id AS info_aux, i.title AS title, i.content AS content
    FROM interactions AS i
    WHERE i.communication_id = 137

    ORDER BY date DESC
    ";
    $this->recursive = $recursive;
    $results = $this->query($sql);
    return count($results);
}`

Answer 1

在控制器中，我会为每个模型设置一些非常通用的选项，如下所示：

    class SampleController extends AppController {
        ...
        var $paginate = array(
            'ModelName' => array( ...general options... )
        );
        ...
    }

然后在每个动作中，您可以自定义它：

    ...
    function index(){
        $this->paginate = array(
            ... specific pagination options for index action ...
        );
        $this->paginate('ModelName');
    }
    ...
    function view(){
        $this->paginate = array(
            ... specific pagination options for view action ...
        );
        $this->paginate('ModelName');
    }

通过这种方式，您可以为每个操作设置自定义分页结果。

希望有所帮助。