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How to find exact Array Match with values in different order using MongoDB?
To find exact array match with values in different order, you can use $all operator. Let us create a collection with documents. Following is the query
>db.exactMatchArrayDemo.insertOne({"StudentName":"David","StudentAge":22,"StudentGameScores":[45,78,98]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9c94702d6669774125246c")
}
>db.exactMatchArrayDemo.insertOne({"StudentName":"Chris","StudentAge":23,"StudentGameScores":[45,78]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9c94a42d6669774125246d")
}Following is the query to display all documents from a collection with the help of find() method
> db.exactMatchArrayDemo.find().pretty();
This will produce the following output
{
"_id" : ObjectId("5c9c94702d6669774125246c"),
"StudentName" : "David",
"StudentAge" : 22,
"StudentGameScores" : [
45,
78,
98
]
}
{
"_id" : ObjectId("5c9c94a42d6669774125246d"),
"StudentName" : "Chris",
"StudentAge" : 23,
"StudentGameScores" : [
45,
78
]
}Following is the query to find exact array match
> db.exactMatchArrayDemo.find({ "StudentGameScores": { "$size" : 2, "$all": [ 78, 45 ] } }).pretty();This will produce the following output
{
"_id" : ObjectId("5c9c94a42d6669774125246d"),
"StudentName" : "Chris",
"StudentAge" : 23,
"StudentGameScores" : [
45,
78
]
}Following is the query to find exact array match but order does not matter. We have set a different size to get the field “StudentGameScores” with 3 values
> db.exactMatchArrayDemo.find({ "StudentGameScores": { "$size" : 3, "$all": [ 78, 45 ] } }).pretty();This will produce the following output
{
"_id" : ObjectId("5c9c94702d6669774125246c"),
"StudentName" : "David",
"StudentAge" : 22,
"StudentGameScores" : [
45,
78,
98
]
}
Updated on: 30-Jul-2019
327 Views
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