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Query Array for 'true' value at index n in MongoDB?
You can use dot(.) notation for this. Let us first create a collection with documents −
>db.containsTrueValueDemo.insertOne({"IsMarried":[true,false,true,true,true,true,false,true,false,false,true]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd5039c2cba06f46efe9ef5")
}Following is the query to display all documents from a collection with the help of find() method −
> db.containsTrueValueDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd5039c2cba06f46efe9ef5"),
"IsMarried" : [
true,
false,
true,
true,
true,
true,
false,
true,
false,
false,
true
]
}Query Array for 'true' value at index n -
> db.containsTrueValueDemo.find({'IsMarried.2' : true});This will produce the following output −
{ "_id" : ObjectId("5cd5039c2cba06f46efe9ef5"), "IsMarried" : [ true, false, true, true, true, true, false, true, false, false, true ] }Query to Array for 'true' value at index n −
> db.containsTrueValueDemo.find({$and : [ {'IsMarried.0' : true}, {'IsMarried.2' : true} ] } );This will produce the following output −
{ "_id" : ObjectId("5cd5039c2cba06f46efe9ef5"), "IsMarried" : [ true, false, true, true, true, true, false, true, false, false, true ] }
Updated on: 30-Jul-2019
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