KnockoutJS with MVC Partialview - asp.net-mvc

Question

I am having problems persisting data from KO observableArray in a MVC Partialview...
I have a side navigation menu where one of the nodes is dynamically built using KOjs 'foreach', and this navigation menu should persist across the site. The menu is rendered ok on the first View page but when I navigate on other page (clicking on menu option or any way) the dynamic node is empty, although the observableArrays were fetched and loaded with the correct data.
It seems like the navigaition menu (which is a partial view) is not refreshing/reloading to render the menu nodes/options again.
Any help si much appreciated. TIA!
self.reports = ko.observableArray([]);
self.reportCategories = ko.observableArray([]);
self.getReports = function () {
App.Server.get("/.../reports/")
.then(function (vm) {
self.reports(vm.reports);
self.reportCategories(vm.categories);
});
};
self.init = function () {
self.getReports();
};
self.init();
<li>
<a class="level1" data-toggle="collapse" href="#report-submenu" aria-expanded="false" aria-controls="collapseExample">Reports</a>
<ul class="level1 collapse" id="report-submenu" data-bind="foreach: reportCategories">
<li>
<a class="level2 collapse" data-toggle="collapse" data-bind="text: label, attr: { href: '#' + value }"
aria-expanded="false" aria-controls="collapseExample"></a>
<ul class="level2 collapse" data-bind="foreach: reports, attr: { id: value }">
<li data-bind="if: category == $parent.categoryId">
<a class="level3" data-bind="text: menuName, attr: { href: reportName }"></a>
</li>
</ul>
</li>
Here's the other part of the code (a Nancy GET method):
Get["/"] = _ =>
{
var reportModel = new ReportModel();
var reports = reportService.GetList();
if (reports != null)
{
// Categories
reportModel.Categories = reports.Select(s => s.Category).Distinct().Select(c => new ReportCategoryModel()
{
CategoryId = c,
Label = c.TrimStart("Reports/".ToCharArray()),
Value = c.ToLower().Replace('/', '-')
}).ToList();
// Reports
reportModel.Reports = reports.Select(r => new ReportRecord()
{
MenuName = r.MenuName,
ReportName = r.ReportName,
Category = r.Category,
}).ToList();
}
return Response.AsJson(reportModel);
};