Nested properties

[kaderiho]

I faced problem that I can't set id in set.props.id if id is nested property. The next case describes this issue:

const Attachment = DefineMap.extend({
    attachmentTO: {
        attachmentType: 'string',
        resourceType: 'string',
        contentType: 'string',
        entityType: 'string',
        entityId: 'string',
        fileSize: 'number',
        urlName: 'string',
        clientId: 'number',
        status: 'string',
        id: 'string'
    },
    downloadUrl: null,
    uploadUrl: null
});

const attachmentsAlgebra = new set.Algebra(
    set.props.id('attachmentTO.id')
);

As a result of this that set.props.id doesn't see the property attachmentTO.id