Question

For example I have n documents:

{ _id : 1 }
{ _id : 2 }
{ _id : 3 }
...
{ _id : n }

By some logic I got array of m _ids: [1, 30, 500, 1001, …, i ];

Is it possible to make ONE request using array of _ids for retrieving Cursor of these m documents? I do not want to make separate requests like:

db.things.findOne({_id:1});

db.things.findOne({_id:30});

db.things.findOne({_id:500});

db.things.findOne({_id:1001});

…

db.things.findOne({_id:i});

And if it is possible, how do that on JavaScript Shell and with official C# driver?

Thank you!!!

Answer 1

c = db.things.find({_id:{$in:[1,30,500,1001,...,i]}})