mongo 数组分页并返回数组中指定的字段

Question

已解决17.37K 浏览2021/06/01数据库

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fcmmy 22 2021/05/24 0条评论

刚接触mongo，希望mongo大佬解惑，感谢。

需求

数据结构中有有个数组`malIps`,这个数组中有个字段`attack`，想对malIps这个数组进行分页，并且不返回`attack`这个数组对象。

mongo中存储的数据结构：

<code class="hljs language-javascript">{
        <span class="hljs-string">"_id"</span> : ObjectId(<span class="hljs-string">"60ab1cd22119d970838a7db8"</span>),
        <span class="hljs-string">"attackTypeAmount"</span> : <span class="hljs-number">7</span>,
        <span class="hljs-string">"logTotal"</span> : <span class="hljs-number">48500</span>,
        <span class="hljs-string">"attackTotal"</span> : <span class="hljs-number">9758</span>,
        <span class="hljs-string">"attackTypeTotal"</span> : {
                <span class="hljs-string">"scanrobots"</span> : <span class="hljs-number">330</span>,
                <span class="hljs-string">"FileInclude"</span> : <span class="hljs-number">4020</span>,
                <span class="hljs-string">"Javaouinstream"</span> : <span class="hljs-number">6</span>,
                <span class="hljs-string">"Sensitivefile"</span> : <span class="hljs-number">4785</span>,
                <span class="hljs-string">"SQLInjection"</span> : <span class="hljs-number">6</span>,
                <span class="hljs-string">"Webshell"</span> : <span class="hljs-number">12</span>,
                <span class="hljs-string">"XSS"</span> : <span class="hljs-number">599</span>
        },
        <span class="hljs-string">"malIpTotal"</span> : <span class="hljs-number">3</span>,
        <span class="hljs-string">"malIps"</span> : [
                {
                        <span class="hljs-string">"attackCounts"</span> : <span class="hljs-number">9758</span>,
                        <span class="hljs-string">"telecomOperator"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"finishTime"</span> : <span class="hljs-string">"2020-12-03 16:05:46"</span>,
                        <span class="hljs-string">"isMalIp"</span> : <span class="hljs-literal">false</span>,
                        <span class="hljs-string">"attackTypeAmount"</span> : <span class="hljs-number">9758</span>,
                        <span class="hljs-string">"ip"</span> : <span class="hljs-string">"192.168.0.112"</span>,
                        <span class="hljs-string">"latitude"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"location"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"startTime"</span> : <span class="hljs-string">"2020-12-02 13:55:59"</span>,
                        <span class="hljs-string">"attackTypeTotal"</span> : {
                                <span class="hljs-string">"scanrobots"</span> : <span class="hljs-number">330</span>,
                                <span class="hljs-string">"FileInclude"</span> : <span class="hljs-number">4020</span>,
                                <span class="hljs-string">"Javaouinstream"</span> : <span class="hljs-number">6</span>,
                                <span class="hljs-string">"Sensitivefile"</span> : <span class="hljs-number">4785</span>,
                                <span class="hljs-string">"SQLInjection"</span> : <span class="hljs-number">6</span>,
                                <span class="hljs-string">"Webshell"</span> : <span class="hljs-number">12</span>,
                                <span class="hljs-string">"XSS"</span> : <span class="hljs-number">599</span>
                        },
                        <span class="hljs-string">"longitude"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"attack"</span> : [
                                {
                                        <span class="hljs-string">"dateTime"</span> : <span class="hljs-string">"2020-12-03 16:05:46"</span>,
                                        <span class="hljs-string">"lineNo"</span> : <span class="hljs-number">48224</span>,
                                        <span class="hljs-string">"log"</span> : <span class="hljs-string">"192.168.0.112 - - [03/Dec/2020:16:05:46  0800] \"GET /noindex/common/css//../../../WEB-INF/web.xml\u0000.jsp HTTP/1.1\" 404 242 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.21 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.21\""</span>,
                                        <span class="hljs-string">"filePath"</span> : <span class="hljs-string">"F:\\test\\logs\\apache\\access_log"</span>,
                                        <span class="hljs-string">"type"</span> : <span class="hljs-string">"Sensitivefile"</span>,
                                        <span class="hljs-string">"status"</span> : <span class="hljs-string">"404"</span>
                                },
                                {
                                        <span class="hljs-string">"dateTime"</span> : <span class="hljs-string">"2020-12-03 16:05:46"</span>,
                                        <span class="hljs-string">"lineNo"</span> : <span class="hljs-number">48272</span>,
                                        <span class="hljs-string">"log"</span> : <span class="hljs-string">"192.168.0.112 - - [03/Dec/2020:16:05:46  0800] \"GET /noindex/common/fonts/documents HTTP/1.1\" 404 228 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.21 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.21\""</span>,
                                        <span class="hljs-string">"filePath"</span> : <span class="hljs-string">"F:\\test\\logs\\apache\\access_log"</span>,
                                        <span class="hljs-string">"type"</span> : <span class="hljs-string">"XSS"</span>,
                                        <span class="hljs-string">"status"</span> : <span class="hljs-string">"404"</span>
                                }
                        ]
                },
                {
                        <span class="hljs-string">"attackCounts"</span> : <span class="hljs-number">9758</span>,
                        <span class="hljs-string">"telecomOperator"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"finishTime"</span> : <span class="hljs-string">"2020-12-03 16:05:46"</span>,
                        <span class="hljs-string">"isMalIp"</span> : <span class="hljs-literal">false</span>,
                        <span class="hljs-string">"attackTypeAmount"</span> : <span class="hljs-number">9758</span>,
                        <span class="hljs-string">"ip"</span> : <span class="hljs-string">"192.168.0.113"</span>,
                        <span class="hljs-string">"latitude"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"location"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"startTime"</span> : <span class="hljs-string">"2020-12-02 13:55:59"</span>,
                        <span class="hljs-string">"attackTypeTotal"</span> : {
                                <span class="hljs-string">"scanrobots"</span> : <span class="hljs-number">330</span>,
                                <span class="hljs-string">"FileInclude"</span> : <span class="hljs-number">4020</span>,
                                <span class="hljs-string">"Javaouinstream"</span> : <span class="hljs-number">6</span>,
                                <span class="hljs-string">"Sensitivefile"</span> : <span class="hljs-number">4785</span>,
                                <span class="hljs-string">"SQLInjection"</span> : <span class="hljs-number">6</span>,
                                <span class="hljs-string">"Webshell"</span> : <span class="hljs-number">12</span>,
                                <span class="hljs-string">"XSS"</span> : <span class="hljs-number">599</span>
                        },
                        <span class="hljs-string">"longitude"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"attack"</span> : [
                                {
                                        <span class="hljs-string">"dateTime"</span> : <span class="hljs-string">"2020-12-03 16:05:46"</span>,
                                        <span class="hljs-string">"lineNo"</span> : <span class="hljs-number">48224</span>,
                                        <span class="hljs-string">"log"</span> : <span class="hljs-string">"192.168.0.113 - - [03/Dec/2020:16:05:46  0800] \"GET /noindex/common/css//../../../WEB-INF/web.xml\u0000.jsp HTTP/1.1\" 404 242 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.21 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.21\""</span>,
                                        <span class="hljs-string">"filePath"</span> : <span class="hljs-string">"F:\\test\\logs\\apache\\access_log"</span>,
                                        <span class="hljs-string">"type"</span> : <span class="hljs-string">"Sensitivefile"</span>,
                                        <span class="hljs-string">"status"</span> : <span class="hljs-string">"404"</span>
                                },
                                {
                                        <span class="hljs-string">"dateTime"</span> : <span class="hljs-string">"2020-12-03 16:05:46"</span>,
                                        <span class="hljs-string">"lineNo"</span> : <span class="hljs-number">48300</span>,
                                        <span class="hljs-string">"log"</span> : <span class="hljs-string">"192.168.0.113 - - [03/Dec/2020:16:05:46  0800] \"GET /noindex/common/images/documents HTTP/1.1\" 404 229 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.21 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.21\""</span>,
                                        <span class="hljs-string">"filePath"</span> : <span class="hljs-string">"F:\\test\\logs\\apache\\access_log"</span>,
                                        <span class="hljs-string">"type"</span> : <span class="hljs-string">"XSS"</span>,
                                        <span class="hljs-string">"status"</span> : <span class="hljs-string">"404"</span>
                                }
                        ]
                },
                {
                        <span class="hljs-string">"attackCounts"</span> : <span class="hljs-number">9758</span>,
                        <span class="hljs-string">"telecomOperator"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"finishTime"</span> : <span class="hljs-string">"2020-12-03 16:05:46"</span>,
                        <span class="hljs-string">"isMalIp"</span> : <span class="hljs-literal">false</span>,
                        <span class="hljs-string">"attackTypeAmount"</span> : <span class="hljs-number">9758</span>,
                        <span class="hljs-string">"ip"</span> : <span class="hljs-string">"192.168.0.114"</span>,
                        <span class="hljs-string">"latitude"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"location"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"startTime"</span> : <span class="hljs-string">"2020-12-02 13:55:59"</span>,
                        <span class="hljs-string">"attackTypeTotal"</span> : {
                                <span class="hljs-string">"scanrobots"</span> : <span class="hljs-number">330</span>,
                                <span class="hljs-string">"FileInclude"</span> : <span class="hljs-number">4020</span>,
                                <span class="hljs-string">"Javaouinstream"</span> : <span class="hljs-number">6</span>,
                                <span class="hljs-string">"Sensitivefile"</span> : <span class="hljs-number">4785</span>,
                                <span class="hljs-string">"SQLInjection"</span> : <span class="hljs-number">6</span>,
                                <span class="hljs-string">"Webshell"</span> : <span class="hljs-number">12</span>,
                                <span class="hljs-string">"XSS"</span> : <span class="hljs-number">599</span>
                        },
                        <span class="hljs-string">"longitude"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"attack"</span> : [ ]
                }
        ]
}</code>

想得到的数据结构，得到`malIps`的前两条数据，不要`attack`字段，如下：

<code class="hljs language-javascript">{
        <span class="hljs-string">"_id"</span> : ObjectId(<span class="hljs-string">"60ab1cd22119d970838a7db8"</span>),
        <span class="hljs-string">"attackTypeAmount"</span> : <span class="hljs-number">7</span>,
        <span class="hljs-string">"logTotal"</span> : <span class="hljs-number">48500</span>,
        <span class="hljs-string">"attackTotal"</span> : <span class="hljs-number">9758</span>,
        <span class="hljs-string">"attackTypeTotal"</span> : {
                <span class="hljs-string">"scanrobots"</span> : <span class="hljs-number">330</span>,
                <span class="hljs-string">"FileInclude"</span> : <span class="hljs-number">4020</span>,
                <span class="hljs-string">"Javaouinstream"</span> : <span class="hljs-number">6</span>,
                <span class="hljs-string">"Sensitivefile"</span> : <span class="hljs-number">4785</span>,
                <span class="hljs-string">"SQLInjection"</span> : <span class="hljs-number">6</span>,
                <span class="hljs-string">"Webshell"</span> : <span class="hljs-number">12</span>,
                <span class="hljs-string">"XSS"</span> : <span class="hljs-number">599</span>
        },
        <span class="hljs-string">"malIpTotal"</span> : <span class="hljs-number">3</span>,
        <span class="hljs-string">"malIps"</span> : [
                {
                        <span class="hljs-string">"attackCounts"</span> : <span class="hljs-number">9758</span>,
                        <span class="hljs-string">"telecomOperator"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"finishTime"</span> : <span class="hljs-string">"2020-12-03 16:05:46"</span>,
                        <span class="hljs-string">"isMalIp"</span> : <span class="hljs-literal">false</span>,
                        <span class="hljs-string">"attackTypeAmount"</span> : <span class="hljs-number">9758</span>,
                        <span class="hljs-string">"ip"</span> : <span class="hljs-string">"192.168.0.112"</span>,
                        <span class="hljs-string">"latitude"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"location"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"startTime"</span> : <span class="hljs-string">"2020-12-02 13:55:59"</span>,
                        <span class="hljs-string">"attackTypeTotal"</span> : {
                                <span class="hljs-string">"scanrobots"</span> : <span class="hljs-number">330</span>,
                                <span class="hljs-string">"FileInclude"</span> : <span class="hljs-number">4020</span>,
                                <span class="hljs-string">"Javaouinstream"</span> : <span class="hljs-number">6</span>,
                                <span class="hljs-string">"Sensitivefile"</span> : <span class="hljs-number">4785</span>,
                                <span class="hljs-string">"SQLInjection"</span> : <span class="hljs-number">6</span>,
                                <span class="hljs-string">"Webshell"</span> : <span class="hljs-number">12</span>,
                                <span class="hljs-string">"XSS"</span> : <span class="hljs-number">599</span>
                        },
                        <span class="hljs-string">"longitude"</span> : <span class="hljs-string">""</span>
                },
                {
                        <span class="hljs-string">"attackCounts"</span> : <span class="hljs-number">9758</span>,
                        <span class="hljs-string">"telecomOperator"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"finishTime"</span> : <span class="hljs-string">"2020-12-03 16:05:46"</span>,
                        <span class="hljs-string">"isMalIp"</span> : <span class="hljs-literal">false</span>,
                        <span class="hljs-string">"attackTypeAmount"</span> : <span class="hljs-number">9758</span>,
                        <span class="hljs-string">"ip"</span> : <span class="hljs-string">"192.168.0.113"</span>,
                        <span class="hljs-string">"latitude"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"location"</span> : <span class="hljs-string">""</span>,
                        <span class="hljs-string">"startTime"</span> : <span class="hljs-string">"2020-12-02 13:55:59"</span>,
                        <span class="hljs-string">"attackTypeTotal"</span> : {
                                <span class="hljs-string">"scanrobots"</span> : <span class="hljs-number">330</span>,
                                <span class="hljs-string">"FileInclude"</span> : <span class="hljs-number">4020</span>,
                                <span class="hljs-string">"Javaouinstream"</span> : <span class="hljs-number">6</span>,
                                <span class="hljs-string">"Sensitivefile"</span> : <span class="hljs-number">4785</span>,
                                <span class="hljs-string">"SQLInjection"</span> : <span class="hljs-number">6</span>,
                                <span class="hljs-string">"Webshell"</span> : <span class="hljs-number">12</span>,
                                <span class="hljs-string">"XSS"</span> : <span class="hljs-number">599</span>
                        },
                        <span class="hljs-string">"longitude"</span> : <span class="hljs-string">""</span>
                }
        ]
}</code>

测试用数据插入：

<code class="hljs">insert({"attackTypeAmount":7,"logTotal":48500,"attackTotal":9758,"attackTypeTotal":{"scanrobots":330,"FileInclude":4020,"Javaouinstream":6,"Sensitivefile":4785,"SQLInjection":6,"Webshell":12,"XSS":599},"malIpTotal":3,"malIps":[{"attackCounts":9758,"telecomOperator":"","finishTime":"2020-12-03 16:05:46","isMalIp":false,"attackTypeAmount":9758,"ip":"192.168.0.112","latitude":"","location":"","startTime":"2020-12-02 13:55:59","attackTypeTotal":{"scanrobots":330,"FileInclude":4020,"Javaouinstream":6,"Sensitivefile":4785,"SQLInjection":6,"Webshell":12,"XSS":599},"longitude":"","attack":[{"dateTime":"2020-12-03 16:05:46","lineNo":48224,"log":"192.168.0.112 - - [03/Dec/2020:16:05:46  0800] \"GET /noindex/common/css//../../../WEB-INF/web.xml\u0000.jsp HTTP/1.1\" 404 242 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.21 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.21\"","filePath":"F:\\test\\logs\\apache\\access_log","type":"Sensitivefile","status":"404"},{"dateTime":"2020-12-03 16:05:46","lineNo":48272,"log":"192.168.0.112 - - [03/Dec/2020:16:05:46  0800] \"GET /noindex/common/fonts/documents HTTP/1.1\" 404 228 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.21 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.21\"","filePath":"F:\\test\\logs\\apache\\access_log","type":"XSS","status":"404"}]},{"attackCounts":9758,"telecomOperator":"","finishTime":"2020-12-03 16:05:46","isMalIp":false,"attackTypeAmount":9758,"ip":"192.168.0.113","latitude":"","location":"","startTime":"2020-12-02 13:55:59","attackTypeTotal":{"scanrobots":330,"FileInclude":4020,"Javaouinstream":6,"Sensitivefile":4785,"SQLInjection":6,"Webshell":12,"XSS":599},"longitude":"","attack":[{"dateTime":"2020-12-03 16:05:46","lineNo":48224,"log":"192.168.0.113 - - [03/Dec/2020:16:05:46  0800] \"GET /noindex/common/css//../../../WEB-INF/web.xml\u0000.jsp HTTP/1.1\" 404 242 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.21 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.21\"","filePath":"F:\\test\\logs\\apache\\access_log","type":"Sensitivefile","status":"404"},{"dateTime":"2020-12-03 16:05:46","lineNo":48300,"log":"192.168.0.113 - - [03/Dec/2020:16:05:46  0800] \"GET /noindex/common/images/documents HTTP/1.1\" 404 229 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.21 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.21\"","filePath":"F:\\test\\logs\\apache\\access_log","type":"XSS","status":"404"}]},{"attackCounts":9758,"telecomOperator":"","finishTime":"2020-12-03 16:05:46","isMalIp":false,"attackTypeAmount":9758,"ip":"192.168.0.114","latitude":"","location":"","startTime":"2020-12-02 13:55:59","attackTypeTotal":{"scanrobots":330,"FileInclude":4020,"Javaouinstream":6,"Sensitivefile":4785,"SQLInjection":6,"Webshell":12,"XSS":599},"longitude":"","attack":[]}]});</code>

查了官方文档，find 和 slice好像实现不了，需要用aggregate() 并使用两个单独的$project可是官方没有对应的例子，咋都凑不出来。

https://docs.mongodb.com/manual/reference/operator/projection/slice/#examples

fcmmy 选择最佳答案 2021/06/01

3 答案

0

xiaoxu 1.13K 发布 2021/05/25 3 条评论

> db.aa.aggregate([{$project:{attackTypeAmount:1,logTotal:1,attackTotal:1,malIps: { $slice: [ “$malIps”, 2 ] }}},{$project:{“malIps.attack”:0}}]).pretty();
{
“_id” : ObjectId(“60ac678fe50c691e5e89e7ca”),
“attackTypeAmount” : 7,
“logTotal” : 48500,
“attackTotal” : 9758,
“malIps” : [
{
“attackCounts” : 9758,
“telecomOperator” : “”,
“finishTime” : “2020-12-03 16:05:46”,
“isMalIp” : false,
“attackTypeAmount” : 9758,
“ip” : “192.168.0.112”,
“latitude” : “”,
“location” : “”,
“startTime” : “2020-12-02 13:55:59”,
“attackTypeTotal” : {
“scanrobots” : 330,
“FileInclude” : 4020,
“Javaouinstream” : 6,
“Sensitivefile” : 4785,
“SQLInjection” : 6,
“Webshell” : 12,
“XSS” : 599
},
“longitude” : “”
},
{
“attackCounts” : 9758,
“telecomOperator” : “”,
“finishTime” : “2020-12-03 16:05:46”,
“isMalIp” : false,
“attackTypeAmount” : 9758,
“ip” : “192.168.0.113”,
“latitude” : “”,
“location” : “”,
“startTime” : “2020-12-02 13:55:59”,
“attackTypeTotal” : {
“scanrobots” : 330,
“FileInclude” : 4020,
“Javaouinstream” : 6,
“Sensitivefile” : 4785,
“SQLInjection” : 6,
“Webshell” : 12,
“XSS” : 599
},
“longitude” : “”
}
]
}

xiaoxu 发表新评论 2021/06/01

fcmmy 已评论 2021/06/01

确实需要使用aggregate，结合两次project投影
aggregate([{$project:{“malIps”:{$slice:[“$malIps”,0,1]}}},{$project:{“malIps.attack”:0}}]).pretty();

fcmmy 已评论 2021/06/01

非常感谢回答

xiaoxu 已评论 2021/06/01

不客气的,以后可以多交流。

确实需要使用aggregate，结合两次project投影
aggregate([{$project:{“malIps”:{$slice:[“$malIps”,0,1]}}},{$project:{“malIps.attack”:0}}]).pretty();

xiaoxu · Answer 1 · 2021-05-25T05:43:36+00:00

find语法4.4中就不支持数组和数组嵌套同时出现，建议aggregate里面通过$projection2次来实现相同功能。

fcmmy · Answer 2 · 2021-06-01T14:20:06+00:00

使用find语法更简单些

> db.aa.find({},{malIps:{$slice:2},”malIps.attack”:0}).pretty();
{
“_id” : ObjectId(“60ac678fe50c691e5e89e7ca”),
“attackTypeAmount” : 7,
“logTotal” : 48500,
“attackTotal” : 9758,
“attackTypeTotal” : {
“scanrobots” : 330,
“FileInclude” : 4020,
“Javaouinstream” : 6,
“Sensitivefile” : 4785,
“SQLInjection” : 6,
“Webshell” : 12,
“XSS” : 599
},
“malIpTotal” : 3,
“malIps” : [
{
“attackCounts” : 9758,
“telecomOperator” : “”,
“finishTime” : “2020-12-03 16:05:46”,
“isMalIp” : false,
“attackTypeAmount” : 9758,
“ip” : “192.168.0.112”,
“latitude” : “”,
“location” : “”,
“startTime” : “2020-12-02 13:55:59”,
“attackTypeTotal” : {
“scanrobots” : 330,
“FileInclude” : 4020,
“Javaouinstream” : 6,
“Sensitivefile” : 4785,
“SQLInjection” : 6,
“Webshell” : 12,
“XSS” : 599
},
“longitude” : “”
},
{
“attackCounts” : 9758,
“telecomOperator” : “”,
“finishTime” : “2020-12-03 16:05:46”,
“isMalIp” : false,
“attackTypeAmount” : 9758,
“ip” : “192.168.0.113”,
“latitude” : “”,
“location” : “”,
“startTime” : “2020-12-02 13:55:59”,
“attackTypeTotal” : {
“scanrobots” : 330,
“FileInclude” : 4020,
“Javaouinstream” : 6,
“Sensitivefile” : 4785,
“SQLInjection” : 6,
“Webshell” : 12,
“XSS” : 599
},
“longitude” : “”
}
]
}

确实需要使用aggregate并且结合两次project：结合您的答案，可以通过如下方式获取：
aggregate([{$project:{“malIps”:{$slice:[“$malIps”,0,1]}}},{$project:{“malIps.attack”:0}}]).pretty();

mongo 数组分页并返回数组中指定的字段

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