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MongoDB query for Partial Object in an array
Let us first create a collection with documents −
> db.queryForPartialObjectDemo.insertOne({_id:new ObjectId(), "StudentDetails": [{"StudentId":1, "StudentName":"Chris"}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cdfcf55bf3115999ed51206")
}
> db.queryForPartialObjectDemo.insertOne({_id:new ObjectId(), "StudentDetails": [{"StudentId":2, "StudentName":"David"}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cdfcf55bf3115999ed51207")
}Following is the query to display all documents from a collection with the help of find() method −
> db.queryForPartialObjectDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cdfcf55bf3115999ed51206"),
"StudentDetails" : [
{
"StudentId" : 1,
"StudentName" : "Chris"
}
]
}
{
"_id" : ObjectId("5cdfcf55bf3115999ed51207"),
"StudentDetails" : [
{
"StudentId" : 2,
"StudentName" : "David"
}
]
}First Approach
Following is the query for partial object in array with MongoDB −
> db.queryForPartialObjectDemo.find({StudentDetails: {StudentId: 1, "StudentName" : "Chris"}});This will produce the following output −
{ "_id" : ObjectId("5cdfcf55bf3115999ed51206"), "StudentDetails" : [ { "StudentId" : 1, "StudentName" : "Chris" } ] }Second Approach
Following is the query for partial object in an array with dot notation −
> db.queryForPartialObjectDemo.find({"StudentDetails.StudentName":"Chris"});This will produce the following output −
{ "_id" : ObjectId("5cdfcf55bf3115999ed51206"), "StudentDetails" : [ { "StudentId" : 1, "StudentName" : "Chris" } ] }
Updated on: 30-Jul-2019
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