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Get all embedded documents with “isMarried” status in a MongoDB collection
To get all embedded documents, use $project in MongoDB. Let us create a collection with documents −
> db.demo220.insertOne({
... "id":101,
... "FullName" : "John Doe",
... "EmailId" : "john12@gmail.com",
... "ShippingDate" : new ISODate(),
... "details" : { "_id" :1001, "isMarried" :true }
...}
...);
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3eaf5b03d395bdc213471d")
}
> db.demo220.insertOne(
...{
... "id":102,
... "FullName" : "John Smith",
... "EmailId" : "johnsmith@gmail.com",
... "ShippingDate" : new ISODate(),
... "details" : { "_id" :1002, "isMarried" :false }
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3eaf5c03d395bdc213471e")
}Display all documents from a collection with the help of find() method −
> db.demo220.find();
This will produce the following output −
{ "_id" : ObjectId("5e3eaf5b03d395bdc213471d"), "id" : 101, "FullName" : "John Doe", "EmailId" : "john12@gmail.com", "ShippingDate" : ISODate("2020-02-08T12:53:47.876Z"), "details" : { "_id" : 1001, "isMarried" : true } }
{ "_id" : ObjectId("5e3eaf5c03d395bdc213471e"), "id" : 102, "FullName" : "John Smith", "EmailId" : "johnsmith@gmail.com", "ShippingDate" : ISODate("2020-02-08T12:53:48.991Z"), "details" : { "_id" : 1002, "isMarried" : false } }Following is the query to get all embedded documents −
> db.demo220.aggregate({ $project : {
... "isMarried" : "$details.isMarried",
... "detailsId" : "$details_id", } });This will produce the following output −
{ "_id" : ObjectId("5e3eaf5b03d395bdc213471d"), "isMarried" : true }
{ "_id" : ObjectId("5e3eaf5c03d395bdc213471e"), "isMarried" : false }
Updated on: 30-Mar-2020
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