CakePHP 3中同一模型的多个关联

Question

我正在使用cakePHP版本3.x.

当我查询MessagesTable时,我想获取发送者和消息接收者的用户数据.我已经在cakePHP 2中多次这样做但我无法弄清楚为什么它不能在3.x版本中运行.

我有一个UsersTable和一个MessagesTable.

UsersTable

$this->hasMany('Messages');

MessagesTable

$this->belongsTo('Users', [
    'foreignKey' => 'sender_id',
    'propertyName' => 'Sender',
]);
$this->belongsTo('Users', [
    'foreignKey' => 'user_id',
    'propertyName' => 'Receiver'
]);

这是我正在使用的查询

$messages = $this->Messages->find()
        ->where(['Messages.user_id' => $this->Auth->user('id')])
        ->orwhere(['Messages.sender_id' => $this->Auth->user('id')])
        ->order(['Messages.created' => 'DESC'])
        ->contain([
            'Users.Pictures',
        ]);

我收回了Receiver数据,但也没有收到Sender数据.任何帮助将非常感激

Answer 1

你的关联是错的.如果对多个关联使用相同的模型,则需要使用不同的别名和className属性(就像在CakePHP 2中一样): -

$this->belongsTo('Sender', [
    'className' => 'Users',
    'foreignKey' => 'sender_id',
    'propertyName' => 'sender',
]);
$this->belongsTo('Receiver', [
    'className' => 'Users',
    'foreignKey' => 'user_id',
    'propertyName' => 'receiver'
]);

这在文档中描述.

在您的示例中,代码Receiver会覆盖关联,User因此您只能Receiver在结果中看到模型.

您的查询需要是这样的: -

$messages = $this->Messages->find()
    ->where(['Messages.user_id' => $this->Auth->user('id')])
    ->orwhere(['Messages.sender_id' => $this->Auth->user('id')])
    ->order(['Messages.created' => 'DESC'])
    ->contain([
        'Receivers' => ['Pictures'],
        'Senders' => ['Pictures']
    ]);