Create Object in Knockout

object.js

function Attachment(data) {
	this.id = ko.observable(data.AttachmentId);
	this.name = ko.observable(data.AttachmentName);
	this.size = ko.observable(data.AttachmentSizeText);
	this.isEmail = ko.observable(data.IsEmail);
}

// map data object from server to Knockout object
var mappedAttachments = $.map(data.detail.Attachments, function (item) { return new Attachment(item); });
		self.attachments(mappedAttachments);