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CakePHP 1.3.4$belongsTo关系表中的问题

cakephp-1.3 models associations cakephp

Harsha M V · 技术社区 · 14 年前

CREATE TABLE `user_relationships` (
  `id` int(11) unsigned NOT NULL auto_increment,
  `status` varchar(255) default 'pending',
  `time` datetime default NULL,
  `user_id` int(11) unsigned NOT NULL,
  `friend_id` int(11) unsigned NOT NULL,
  PRIMARY KEY  (`id`),
  KEY `fk_user_relationships_users1` (`user_id`),
  KEY `fk_user_relationships_users2` (`friend_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

var $belongsTo = array(
    'User' => array(
        'className' => 'User',
        'foreignKey' => 'user_id',
        'conditions' => '',
        'fields' => '',
        'order' => ''
    ),
    'Friend' => array(
        'className' => 'Friend',
        'foreignKey' => 'friend_id',
        'conditions' => '',
        'fields' => '',
        'order' => ''
    )
);

在这部分代码中,我想将friend\u id引用到User表

    'Friend' => array(
        'className' => 'Friend',
        'foreignKey' => 'friend_id',
        'conditions' => '',
        'fields' => '',
        'order' => ''
    )

    'Friend' => array(
        'className' => 'Friend',
        'foreignKey' => 'user_id',
        'conditions' => '',
        'fields' => '',
        'order' => ''
    )

3 回复 | 直到 14 年前

deceze 14 年前

这个怎么样?

class UserRelationship {

    var $belongsTo = array(
        'User' => array(
            'className' => 'User',
            'foreignKey' => 'user_id'
        ),
        'Friend' => array(
            'className' => 'User',
            'foreignKey' => 'friend_id'
        )
    );

}

class User {

    var $hasAndBelongsToMany = array(
        'Friend' => array(
            'className' => 'User',
            'joinTable' => 'user_relationships',
            'foreignKey' => 'user_id',
            'associationForeignKey' => 'friend_id',
            'with' => 'UserRelationship'
         )
    );

}

从不同的角度可以看到关联:

User        <-    Relationship    ->     User
 |                     |                  |
 hasMany           belongsTo              |
 Relationship  <-  User (user_id)        hasMany
 |                 User (friend_id)  ->  Relationship
 |                                        |
 HABTM                                   HABTM
 User       <---------------------->     User

您的“物理”布局(即数据库模式)是 User -> Relationship -> User User -> User User hasAndBelongsToMany User 关联(也称为多对多)。由于它使用三种模型,因此多对多关联可以分解为:

用户有许多关系/属于用户的关系
关系属于用户/用户有许多关系

你不知道 hasAndBelongsToMany协会,但这是你真正想要的。您根本不需要关系模型,因为它只是连接两个用户的助手模型,但是如果您做

Tim Falk 14 年前

你的“朋友”的类名是错误的。因为您没有表“friends”,所以没有模型“friends”,并且您有引用类“User”的权限,因为它们共享同一个表。

'Friend' => array(
    'className' => 'User',
    'foreignKey' => 'friend_id',
    'conditions' => '',
    'fields' => '',
    'order' => ''
)

mmakowski 14 年前

class User extends AppModel {
    var $hasAndBelongsToMany = array(
        'Friends1' => array(
            'className' => 'User',
            'joinTable' => 'friends',
            'foreignKey' => 'user_id',
            'associationForeignKey' => 'friend_id',
            'with' => 'Friend'
         ),
        'Friends2' => array(
            'className' => 'User',
            'joinTable' => 'friends',
            'foreignKey' => 'friend_id',
            'associationForeignKey' => 'user_id',
            'with' => 'Friend'
         )
    );

    function afterFind(array $results) {

        // Merge both sides of the relationship into one alias
        foreach ($results as $key=>$result) {
            if (isset($result["Friends1"]) && isset($result["Friends2"])) {
                $results[$key]["Friends"] = array_merge($result["Friends1"], $result["Friends2"]);
                unset($results[$key]["Friends1"]);
                unset($results[$key]["Friends2"]);
            }
        }

这很混乱,但你得到了这样一个想法:抓住关系的双方,然后在数据库读取后合并它们:)