如何从 mongodb 聚合结果中删除 waitedMS 和 ok？答案

【问题标题】：How to remove waitedMS and ok from mongo db aggregation result?如何从 mongodb 聚合结果中删除 waitedMS 和 ok？
【发布时间】：2017-04-06 05:32:13
【问题描述】：

我正在 mongodb php 应用程序中执行聚合命令，如下面的代码行。

<?php

 $query =  array('$or' => array(
    array('employeeList'=>array('$exists' => false)),
    array('employeeList'=>array('$eq' => null)),
    array('employeeList'=>array('$eq' => ",")),
    array('employeeList'=>array('$eq' => ""))
));

$pipeline = array(
    array(
        '$match' => $query
    ),
    array(
        '$lookup' => array(
            'from' => 'userTbl',
            'localField' => 'user_id',
            'foreignField' => 'uid',
            'as' => 'userdetails'
        )
    ),
);

$output = $this->db->broadcastTbl->aggregate($pipeline);
$result =array();
array_push($result, $output);

现在输出显示为

[{"waitedMS":0,"result":[{"_id":{"$id":"58d7a6561d78597411000029"},"broadcast_id":35,"studentList":"","employeeList":"999","mailTitle":"hello","broadcastMessage":"how","emailSent":"0","userdetails":[]},{"_id":....
...
"ok":1}]

我想删除“waitedMS”：0。来自 json 的“结果”：和“确定”：1。输出应该是这样的

[{"_id":{"$id":"58d7a6561d78597411000029"},"broadcast_id":35,"studentList":"","employeeList":"999","mailTitle":"hello","broadcastMessage":"how","emailSent":"0","userdetails":[]}, ...
]

请帮帮我！！！

【问题讨论】：

我在这里看不到任何输出，但那不就是$output["result"]吗？
你是绝对正确的，但它现在显示为 [[ .... ]] 我想要 [...]
How do I extract data from JSON with PHP?的可能重复

标签： php json mongodb mongodb-php

【解决方案1】：

您需要做的就是访问“结果”项。不要把它推到另一个数组上。

<?php

 $query =  array('$or' => array(
    array('employeeList'=>array('$exists' => false)),
    array('employeeList'=>array('$eq' => null)),
    array('employeeList'=>array('$eq' => ",")),
    array('employeeList'=>array('$eq' => ""))
));

$pipeline = array(
    array(
        '$match' => $query
    ),
    array(
        '$lookup' => array(
            'from' => 'userTbl',
            'localField' => 'user_id',
            'foreignField' => 'uid',
            'as' => 'userdetails'
        )
    ),
);

$output = $this->db->broadcastTbl->aggregate($pipeline);

$result = $output["result"];

【讨论】：