Knockout Mapping toJSON - cannot ignore nested child

Question

Assume I have a viewModel like below.

var data = {
        a: { a1: "a1", a2: "a2" },
        b: "b"
    };

I would like to ignore a.a1 and b. So my expected JSON is

{"a":{a2:"a2"}}

However, on doing this

var result = ko.mapping.toJSON(data, { ignore: ["a.a1", "b"] })

I am getting result=

{"a":{"a1":"a1","a2":"a2"}}

Knockout mapping is not ignoring a.a1. Is this a bug in the plugin? It correctly ignored 'b' but why not 'a.a1'?

Answer 1

The names found in the ignore array should be the name of the property, regardless of what level it is in the object. You have to use:

{ ignore: [ "a1", "b" ] }