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Search for documents matching first item in an array with MongoDB?
Let us first create a collection with documents −
> db.matchingFirstItemInTheArrayDemo.insertOne(
{
"ClientDetails": [
{
"ClientName": "Larry",
"ClientAge":28
}
]
}
);
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd7a5d26d78f205348bc636")
}
> db.matchingFirstItemInTheArrayDemo.insertOne(
{
"ClientDetails": [
{
"ClientName": "Chris",
"ClientAge":56,
}
]
}
);
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd7a5f56d78f205348bc637")
}
> db.matchingFirstItemInTheArrayDemo.insertOne(
{
"ClientDetails": [
{
"ClientName": "Robert",
"ClientAge":46,
}
]
}
);
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd7a6076d78f205348bc638")
}Following is the query to display all documents from a collection with the help of find() method −
> db.matchingFirstItemInTheArrayDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd7a5d26d78f205348bc636"),
"ClientDetails" : [
{
"ClientName" : "Larry",
"ClientAge" : 28
}
]
}
{
"_id" : ObjectId("5cd7a5f56d78f205348bc637"),
"ClientDetails" : [
{
"ClientName" : "Chris",
"ClientAge" : 56
}
]
}
{
"_id" : ObjectId("5cd7a6076d78f205348bc638"),
"ClientDetails" : [
{
"ClientName" : "Robert",
"ClientAge" : 46
}
]
}Following is the query to search for documents matching first item in array −
> db.matchingFirstItemInTheArrayDemo.find({"ClientDetails.0.ClientName":"Chris"});This will produce the following output −
{ "_id" : ObjectId("5cd7a5f56d78f205348bc637"), "ClientDetails" : [ { "ClientName" : "Chris", "ClientAge" : 56 } ] }
Updated on: 30-Jul-2019
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