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POMongoDb Aggregate function issue with php
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  1. POMongoDb Aggregate function issue with php
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    copied!<p>I am new to mongoDb and facing issue in using aggregate function. I am trying to get sum of the fields "expectations" and "overall" but it returns 0. I also want to take the total count of the comments which are not empty or null in the same query. </p> <pre><code>$out = $collection-&gt;aggregate ( array( array( '$match' =&gt; array( 'id' =&gt; 6200 )), array ('$unwind' =&gt; '$reviews'), array( '$group' =&gt; array( '_id' =&gt; '$id', 'exptotal' =&gt; array( '$sum' =&gt; array('reviews' =&gt; '$expectations') ), 'total' =&gt; array( '$sum' =&gt; array('reviews' =&gt; '$overall' ) ), 'count' =&gt; array( '$sum' =&gt; 1 ) ) ) ) ); </code></pre> <p>Here is the json</p> <pre><code>{ "_id": "528c62406a542f7c6a6bf522", "id": 6200, "categories": [ { "id": 6, "name": "Artificial Intelligence" }, { "id": 5, "name": "Statistics and Data Analysis" } ], "courseId": "COURSE_16", "institute": { "id": 5693, "name": "YZ University" }, "instructors": [ " A Morris" ], "language": "en", "reviews": [ { "username": "kalis", "expectations": 3, "content": 2, "overall": 3, "comments": "This is really good course for improvement", "datecreated": "2013-11-02T17:04:11.102Z" }, { "username": "julia", "expectations": 4, "content": 2, "overall": 2, "comments": "This improves my skill a lot", "datecreated": "2013-11-03T17:04:11.102Z" }, { "username": "john", "expectations": 2, "content": 4, "overall": 4, "comments": "", "datecreated": "2013-11-04T17:04:11.102Z" } ], "shortName": "ml", "title": "Machine Learning" </code></pre> <p>}</p>
 

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