Cannot call method indexOf undefined

I'm getting the error, cannotcall method indexOf 'undefined' when using the ko utils array Filter . . .

View Model:

viewModel.People = ko.mapping.fromJS(people);

self.Filter1 = ko.observable();    

self.FilteredSystem = ko.computed(function () {

    var Filter1 = self.Filter1();

        return ko.utils.arrayFilter(viewModel.People(), function (People) {

            return ((People.Name.indexOf(Filter1) !== -1));


}, self);


Because you used the mapping plugin, the Name property is going to be an observable and you have to unwrap it (People.Name().indexOf...) to get its value.

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