CakePHP -如何将这些模型链接在一起(这需要使用关系表) - CakePHP - How do I link these models together (that requires use of a relation table)?

我目前使用CakePHP 2.0-RC1。虽然我很聪明，但我只遇到过一个让我无法思考的挑战。我已经阅读了将模型链接在一起的文档(http://www.cakedocs.com/models/associations-linking-models-together.html)，但是我如何告诉CakePHP通过关系表搜索并找到我要的值?让我解释一下。

我有一个类似于下面的数据库结构(它已经简化了问题。PK =主键。FK =外键)

游戏

 - INT(11) id (PK)
 - VARCHAR(100) name
 - VARCHAR(40) year
 - VARCHAR(10) age

 - INT(11) id (PK)
 - VARCHAR(50) name

game_category

 - INT(11) game_id (FK)
 - INT(11) category_id (FK)

对两者关系的解释:

游戏可以有一个或多个类别。这种关系在"game_category"表中定义。我希望CakePHP不仅能找到游戏的类别id，当我做$this-> game ->find('first')时，我也想要类别名称。我猜CakePHP需要被告知"继续通过game_category表和类别表"，并找到每个类别的名称实际上是什么。

我有这些模型

Game.php

<?php
class Game extends AppModel {
    var $useTable = 'game';
    var $hasMany = array(
    'GameCategory' => array(
        'fields' => '*',
        'className' => 'GameCategory',
        )
    );
    var $hasOne = 'Review';  
}
?>

GameCategory.php

<?php
class GameCategory extends AppModel {
    var $useTable = 'game_category';
    var $belongsTo = 'category';
    var $hasMany = array(
    'Category' => array(
        'fields' => '*',
        'foreignKey' => 'category_id',
        'className' => 'Category',
        'conditions' => array('GameCategory.game_id' => 'Game.id', 'GameCategory.category_id' => 'Category.id'),
    )
    );
}
?>

Category.php

<?php
class Category extends AppModel {
    var $useTable = 'category';   
    var $belongsTo = 'GameCategory';
}
?>

根据上面定义的关系，我得到这样的结果:

Array
(
    [Game] => Array
        (
            [id] => 2
            [name] => Colonization
            [year] => 1995
            [age] => 7
        )
    [GameCategory] => Array
        (
            [0] => Array
                (
                    [game_id] => 2
                    [category_id] => 19
                )
            [1] => Array
                (
                    [game_id] => 2
                    [category_id] => 16
                )
        )
)

剩下的唯一事情就是获取每个类别的实际名称。我希望这些对你有意义。

您应该在book online中看到hasAndBelongsToMany (HABTM)，并且应该将表名称game_category更改为games_categories以正确约定。

Game.php

<?php
class Game extends AppModel {
    var $name = 'Game';
    var $hasAndBelongsToMany = array(
    'Category' =>
        array(
            'className'              => 'Category',
            'joinTable'              => 'game_category',
            'foreignKey'             => 'game_id',
            'associationForeignKey'  => 'category_id',
        )
);

}div ?>

所有表名必须为复数(游戏，类别)
类别关联错误，必须使用andbelongstomany
使用蛋糕控制台(./cake bake)来防止将来出现这样的错误

<?php
class Category extends AppModel {
    var $name = 'Category';
    var $displayField = 'name';
    //The Associations below have been created with all possible keys, those that are not needed can be removed
    var $hasAndBelongsToMany = array(
        'Game' => array(
            'className' => 'Game',
            'joinTable' => 'game_categories',
            'foreignKey' => 'category_id',
            'associationForeignKey' => 'game_id',
            'unique' => true,
            'conditions' => '',
            'fields' => '',
            'order' => '',
            'limit' => '',
            'offset' => '',
            'finderQuery' => '',
            'deleteQuery' => '',
            'insertQuery' => ''
        )
    );
} 
<?php
class Game extends AppModel {
    var $name = 'Game';
    var $displayField = 'name';
    //The Associations below have been created with all possible keys, those that are not needed can be removed
    var $hasMany = array(
        'GameCategory' => array(
            'className' => 'GameCategory',
            'foreignKey' => 'game_id',
            'dependent' => false,
            'conditions' => '',
            'fields' => '',
            'order' => '',
            'limit' => '',
            'offset' => '',
            'exclusive' => '',
            'finderQuery' => '',
            'counterQuery' => ''
        )
    );
}
#games
$games = $this->Game->Category->find('all');