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How do you test if two external values are equal in a MongoDB criteria object?
To test the values, use $type. Let us create a collection with documents −
> db.demo211.insertOne({id:101,"Name":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3e298203d395bdc21346fa")
}
> db.demo211.insertOne({id:102,"Name":null});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3e2a5403d395bdc21346fb")
}Display all documents from a collection with the help of find() method −
> db.demo211.find();
This will produce the following output −
{ "_id" : ObjectId("5e3e298203d395bdc21346fa"), "id" : 101, "Name" : "Chris" }
{ "_id" : ObjectId("5e3e2a5403d395bdc21346fb"), "id" : 102, "Name" : null }Following is the query to test if two external values are equal in a MongoDB criteria object −
> v1=200;
200
> v2=200;
200
> db.demo211.find({Name : 'Chris', Name : { $type : 1 + (v1 === v2) }});This will produce the following output −
{ "_id" : ObjectId("5e3e298203d395bdc21346fa"), "id" : 101, "Name" : "Chris" }
Updated on: 27-Mar-2020
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