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MongoDB query check if value in array property?
You can use $in operator to check if a value is in an array or not. Let us first create a collection with documents −
> db.valueInArrayDemo.insertOne({"UserName":"John","UserMessage":["Hi","Hello","Bye"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd684cf7924bb85b3f48959") } > db.valueInArrayDemo.insertOne({"UserName":"Larry","UserMessage":["Thank You","Amazing","Nice"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd684d27924bb85b3f4895a") } >db.valueInArrayDemo.insertOne({"UserName":"Carol","UserMessage":["Awesome","Bye","Cool"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd684d87924bb85b3f4895b") }
Following is the query to display all documents from a collection with the help of find() method −
> db.valueInArrayDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd684cf7924bb85b3f48959"),
"UserName" : "John",
"UserMessage" : [
"Hi",
"Hello",
"Bye"
]
}
{
"_id" : ObjectId("5cd684d27924bb85b3f4895a"),
"UserName" : "Larry",
"UserMessage" : [
"Thank You",
"Amazing",
"Nice"
]
}
{
"_id" : ObjectId("5cd684d87924bb85b3f4895b"),
"UserName" : "Carol",
"UserMessage" : [
"Awesome",
"Bye",
"Cool"
]
}Following is the query to check if a specific value is in an array with $in −
> db.valueInArrayDemo.find({UserMessage:{$in:["Bye"]}});
This will produce the following output −
{ "_id" : ObjectId("5cd684cf7924bb85b3f48959"), "UserName" : "John", "UserMessage" : [ "Hi", "Hello", "Bye" ] }
{ "_id" : ObjectId("5cd684d87924bb85b3f4895b"), "UserName" : "Carol", "UserMessage" : [ "Awesome", "Bye", "Cool" ] }
Updated on: 30-Jul-2019
2K+ Views
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