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How do I work with array fields in MongoDB to match all?
To match all in MongoDB, use $all. The $all operator selects the documents where the value of a field is an array that contains all the specified elements. Let us create a collection with documents −
> db.demo695.insertOne({"ListOfValues":[100,200,500,800]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea6d4c4551299a9f98c938f")
}
> db.demo695.insertOne({"ListOfValues":[1000,200,4000]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea6d4cf551299a9f98c9390")
}Display all documents from a collection with the help of find() method −
> db.demo695.find();
This will produce the following output −
{ "_id" : ObjectId("5ea6d4c4551299a9f98c938f"), "ListOfValues" : [ 100, 200, 500, 800 ] }
{ "_id" : ObjectId("5ea6d4cf551299a9f98c9390"), "ListOfValues" : [ 1000, 200, 4000 ] }Following is the query to work with array field and match all −
> db.demo695.find({"ListOfValues":{$all:[1000,200,4000]}});This will produce the following output −
{ "_id" : ObjectId("5ea6d4cf551299a9f98c9390"), "ListOfValues" : [ 1000, 200, 4000 ] }
Updated on: 14-May-2020
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