设置客户端模型

class Client extends CActiveRecord
{    
    //...
    /**
     * @return array relational rules.
     */
    public function relations()
    {
            // NOTE: you may need to adjust the relation name and the related
            // class name for the relations automatically generated below.
            return array(
                    'brands' => array(self::HAS_MANY, 'Brand', 'client_id'),
            );
    }
    //...
    public function defaultScope() {
        return array('select'=>'my, columns, to, select, from, client'); //or just comment this to select all "*"
    }

}

设置品牌型号

class Brand extends CActiveRecord
{
    //...
    /**
     * @return array relational rules.
     */
    public function relations()
    {
            // NOTE: you may need to adjust the relation name and the related
            // class name for the relations automatically generated below.
            return array(
                    'client' => array(self::BELONGS_TO, 'Client', 'client_id'),
            );
    }
    //...
    //...
    public function defaultScope() {
        return array('select'=>'my, columns, to, select, from, brand'); //or just comment this to select all "*"
    }

}

在您的行动功能中进行客户/品牌搜索

$clients = Client::model()->with('brands')->findAllByAttributes(array('status'=>1));

$clientsArr = array();
if($clients) {
    foreach($clients as $client) {
        $clientsArr[$client->id]['name'] = $client->name; //assign only some columns not entire $client object.
        $clientsArr[$client->id]['brands'] = array();

        if($client->brands) {
            foreach($client->brands as $brand) {
                $clientsArr[$client->id]['brands'][] = $brand->id;
            }
        }

    }
}

print_r($clientsArr);
/*
Array (
    [1] => Array (
        name => Client_A,
        brands => Array (
            0 => Brand_A,
            1 => Brand_B,
            2 => Brand_C
        )
    )
    ...
)

* /

这是你想要的吗？我意识到，如果你只想选择品牌ID（没有更多的数据），你可以通过SQL和GROUP_CONCAT（MySQL）搜索，并选择所有的品牌ID为客户端在一行中用逗号分隔。1,2,3,4,5,20,45,102。

如果您不想使用CActiveRecord的with()功能，那么您应该编写一个SQL查询来连接brand表。

$rows = Yii::app()->db
    ->createCommand(
        'SELECT c.*, b.id as brand_id 
        FROM client c INNER JOIN brand b 
        WHERE c.status = 1 AND b.client_id = c.id')
    ->queryAll();
$clients = array();
foreach ($rows as row) {
    if (!isset($clients[$row['id']])) {
        $clients[$row['id']] = $row;
        $clients[$row['id']]['brands'] = array();
    }
    $clients[$row['id']]['brands'][] = $row['brand_id'];
}

这比执行一个查询来检索所有客户，然后执行N个查询来获取其品牌（其中N是客户的数量）要高效得多。您还可以连接第三个表projects，并检索每个品牌的所有相关项目。

我知道这是旧的，但我一直在寻找一个解决方案，我自己，我认为这是一个很好的。
在我的基本控制器类（protected/Components/Controller.php）中，我添加了以下函数：

protected function renderJsonDeep($o) {
    header('Content-type: application/json');
        // if it's an array, call getAttributesDeep for each record
    if (is_array($o)) {
        $data = array();
        foreach ($o as $record) {
            array_push($data, $this->getAttributesDeep($record));
        }
        echo CJSON::encode($data);
    } else {
            // otherwise just do it on the passed-in object
        echo CJSON::encode( $this->getAttributesDeep($o) );
    }

        // this just prevents any other Yii code from being output
    foreach (Yii::app()->log->routes as $route) {
        if($route instanceof CWebLogRoute) {
            $route->enabled = false; // disable any weblogroutes
        }
    }
    Yii::app()->end();
}

protected function getAttributesDeep($o) {
        // get the attributes and relations
        $data = $o->attributes;
    $relations = $o->relations();
    foreach (array_keys($relations) as $r) {
            // for each relation, if it has the data and it isn't nul/
        if ($o->hasRelated($r) && $o->getRelated($r) != null) {
                    // add this to the attributes structure, recursively calling
                    // this function to get any of the child's relations
            $data[$r] = $this->getAttributesDeep($o->getRelated($r));
        }
    }
    return $data;
}

现在，在一个对象或对象数组上调用renderJsonDeep，将对JSON中的对象进行编码，包括您拉取的任何关系，就像将它们添加到DbCriteria中的'with'参数一样。
如果子对象有任何关系，也会在JSON中设置这些关系，因为getAttributesDeep是递归调用的。
希望这能帮助到一些人。