Sub-document to new document along with existing main document

Working with Data
3

Hi, @slava I got your point. But, i have a parent child relationship in a same collection. So, to fetch the child objects, i’m using lookup but it returns child objects in an array.

Result like this:

{
    _id: 1,
    name: "Parent product",
    is_child: false,
    is_parent: true,
    children: [
        {
            _id: 1,
            name: "Child 1",
            is_child: true,
            is_parent: false,
            children : []
        },
        {
            _id: 2,
            name: "Child 2",
            is_child: true,
            is_parent: false,
            children : []
        }
    ] 
}

This is my exact structure. Parent & child record should be in different objects.

Output like this:

{
    _id: 1,
    name: "Parent product",
    is_child: false,
    is_parent: true,
},
 {
    _id: 1,
    name: "Child 1",
    is_child: true,
    is_parent: false,
    children : []
},
{
    _id: 2,
    name: "Child 2",
    is_child: true,
    is_parent: false,
    children : []
}

@slava So can you help me out to get the exact structure of output.