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Find document that matches same array elements in MongoDB?
To find a document that matches the same array elements, use find() and within that, 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.demo543.insertOne({id:101, subject:["MySQL", "Java" ,"C","Python"]});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8e1b2f9e5f92834d7f05c9")
}
> db.demo543.insertOne({id:102, subject:["MySQL", "MongoDB" ,"SQL Server"]});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8e1b2f9e5f92834d7f05ca")
}Display all documents from a collection with the help of find() method −
> db.demo543.find();
This will produce the following output −
{ "_id" : ObjectId("5e8e1b2f9e5f92834d7f05c9"), "id" : 101, "subject" : [ "MySQL", "Java", "C", "Python" ] }
{ "_id" : ObjectId("5e8e1b2f9e5f92834d7f05ca"), "id" : 102, "subject" : [ "MySQL", "MongoDB", "SQL Server" ] }Following is the query to find a document that matches the same array elements in MongoDB −
> db.demo543.find({
... "subject": { $all: [ "MySQL", "MongoDB", "SQL Server"], $size: 3 }
... })This will produce the following output −
{ "_id" : ObjectId("5e8e1b2f9e5f92834d7f05ca"), "id" : 102, "subject" : [ "MySQL", "MongoDB", "SQL Server" ] }
Updated on: 14-May-2020
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