mongodb subelement querying

Question

here is the example

> db.test.insert({ name: \'test\', values: [ { check: true }, { check: false } ] })
> db.find({ values.check: true })[0]
         


        

Answer 1

You can use the $ projection operator to include just the first values array element that matched the query:

 db.test.find({ 'values.check': true }, {name: 1, 'values.$': 1})

returns:

{
    "_id": ObjectId("50e22046dc278908f3a38a8e"), 
    "name": "test", 
    "values": [ { "check": true } ] }