cakephp：擴展模型類以覆蓋分頁方法

Question

我花了最近2天在cakephp中尋找分頁問題的解決方案。

總之，我需要不同的分頁方法爲同一模型。索引操作將使用默認方法，視圖操作將使用具有自定義查詢的方法。

基於OOP的繼承概念，我認爲解決方案是擴展我的模型並覆蓋擴展模型上的分頁方法。所以，我可以從控制器調用索引操作的默認分頁方法和視圖操作的自定義方法。

問題是：如何擴展我的模型類？將工作這個ideia？

這是我的模型：

<?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; 

} 

} 

這是我的兩個自定義分頁方法，我需要使用剛剛視圖操作：

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，我會成立每個模型的一些非常普通的選項，比如：

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

，然後將每個動作裏，你可以自定義我t：

... 
    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'); 
    } 

這樣您就可以爲每個操作定製自定義分頁結果。

希望有所幫助。