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How to select MongoDB document that does not consist a specific field?
<p>Check for a specific field using MongoDB <span>$</span>exists. If that field does not exist in a document, then you need to display the same document with find().</p><p>Let us create a collection with documents −</p><pre class="prettyprint notranslate">> db.demo612.insertOne({id:1,"Info":[{Name:"Chris",Age:21},{Name:"David"}]});{ "acknowledged" : true, "insertedId" : ObjectId("5e987372f6b89257f5584d87") }</pre><p>Display all documents from a collection with the help of find() method −</p><pre class="prettyprint notranslate">> db.demo612.find().pretty();</pre><p>This will produce the following output −</p><pre class="result notranslate">{ "_id" : ObjectId("5e987372f6b89257f5584d87"), "id" : 1, "Info" : [ { "Name" : "Chris", "Age" : 21 }, { "Name" : "David" } ] }</pre><p>Following is the query to fetch a MongoDB document that does not consist of a specific field −</p><pre class="result notranslate">> db.demo612.aggregate({$unwind: "$Info"}, ... {$match: {"Info.Age":{$exists: false}}}, ... {$project: {"Info.Name": 1}})</pre><p>This will produce the following output −</p><pre class="result notranslate">{ "_id" : ObjectId("5e987372f6b89257f5584d87"), "Info" : { "Name" : "David" } }</pre>
Updated on 15-May-2020 08:09:00
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