php - Yii:在 AR 的两边关联 n:m

Question

为了更好的用户体验，我不想只是做一个随便的PM系统，而是把它实际分组到对话中。作为一项附加功能，能够同时向多人发送消息。多次请求的东西。所以我创建了这个:

/*
    User conversations

        ONE Conversation
        HAS MANY Conversation Members
            HAS MANY Users
        HAS MANY Private Messages

        ONE Private Message
        HAS ONE Conversation

        ONE User
        HAS MANY Conversation Member
            HAS ONE Conversation
*/
CREATE TABLE IF NOT EXISTS `tbl_user_pm_conv_members` (
    `user_id` int(11),
    `conv_id` int(11)
);
CREATE TABLE IF NOT EXISTS `tbl_user_pm_conv` (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `owner_id` int(11) NOT NULL,
    `subject` varchar(255) NOT NULL,
    PRIMARY KEY (`id`)
);
CREATE TABLE IF NOT EXISTS `tbl_user_pm_msg` (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `conv_id` int(11) NOT NULL,
    `from_id` int(11) NOT NULL,
    `body` text NOT NULL,
    `sent` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (`id`)
);

我希望这真的有意义......

现在，我想在 Yii(当前为 1.1.16)中设置 n:m 关系。但是无论我做什么，它都不想解决。

在 User.php 中:

public function relations() {
    return array(
        'profile'=>array(self::HAS_ONE, 'UserProfile', 'uID'),
        'updates'=>array(self::HAS_MANY, "UserUpdate", "tID"),
        'permissions'=>array(self::HAS_MANY, "UserPermissions", "uID"),
        'settings'=>array(self::HAS_ONE, "UserSettings", "id"),
        'convos'=>array(
            self::MANY_MANY, "PrivateConversation",
            "tbl_user_pm_conv_members(id,id)",
        )
    );
}

根据 Yii 的逻辑，我的 FK 可能应该是 user_id 和 convo_id，结果是 tbl_user_pm_conv_members(user_id, convo_id)。我也没有设置 MySQL 约束，因为我还不了解它们。

当我尝试 print_r($user->convos) 时，我得到了这个:

2015/04/28 23:49:01 [error] [system.db.CDbCommand] CDbCommand::fetchAll() failed: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'convos_convos.id' in 'on clause'. The SQL statement executed was: SELECT `convos`.`id` AS `t1_c0`, `convos`.`owner_id` AS `t1_c1`, `convos`.`subject` AS `t1_c2` FROM `tbl_user_pm_conv` `convos`  INNER JOIN `tbl_user_pm_conv_members` `convos_convos` ON (`convos_convos`.`id`=:ypl0) AND (`convos`.`id`=`convos_convos`.`id`).
2015/04/28 23:49:01 [error] [exception.CDbException] exception 'CDbException' with message 'CDbCommand failed to execute the SQL statement: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'convos_convos.id' in 'on clause'' in /Users/Ingwie/Work/BIRD3/php_modules/yiisoft/yii/framework/db/CDbCommand.php:543

我迷路了。建立 n:m 关系的正确方法是什么？

Answer 1

你有一个错误:

"tbl_user_pm_conv_members(id,id)",

应该是:

"tbl_user_pm_conv_members(user_id,conv_id)",