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Fetch all the ids of MongoDB documents?
To fetch all the ids, simply use find() in MongoDB. Let us create a collection with documents −
> db.demo169.insertOne({"StudentName":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e36975e9e4f06af551997d7")
}
> db.demo169.insertOne({"StudentName":"Bob"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3697629e4f06af551997d8")
}
> db.demo169.insertOne({"StudentName":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3697679e4f06af551997d9")
}Display all documents from a collection with the help of find() method −
> db.demo169.find();
This will produce the following output −
{ "_id" : ObjectId("5e36975e9e4f06af551997d7"), "StudentName" : "Chris" }
{ "_id" : ObjectId("5e3697629e4f06af551997d8"), "StudentName" : "Bob" }
{ "_id" : ObjectId("5e3697679e4f06af551997d9"), "StudentName" : "David" }Following is the query to get document ids of all the MongoDB documents in a collection −
> var iterator=db.demo169.find({},{"StudentName":0});Display all documents from a collection with the help of find() method −
> iterator;
This will produce the following output −
{ "_id" : ObjectId("5e36975e9e4f06af551997d7") }
{ "_id" : ObjectId("5e3697629e4f06af551997d8") }
{ "_id" : ObjectId("5e3697679e4f06af551997d9") }
Updated on: 01-Apr-2020
1K+ Views
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