How to use underscorejs _.where on an knockoutjs observable array?

Question

I need to find a report among the reports observable array by Id. How am I supposed to write the underscore statement?

I am using:

_.where(reports(), {id:data.ReportId})

and

_.where(reports(), {id:ko.observable(data.ReportId)})

It always return an empty array.

Then I find out some underscoreKO.js, but it still won't work. Can someone help me? Thanks.

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There is another similar post here, but they are not exactly the same. ko.utils.arrayFirst can locate the item, but won't help me update it.

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The correct answer came from Daniel A. White, with a little change. Thank you.

One correction:

var record = _.filter(reports(), function (item) { return item.id() == data.ReportId; })
if (record.length > 0) {
    _.first(record).reportStatus("Approved");
}

I find it has to be item.id() instead of just id(). But a million thanks to Daniel!

Answer 1

I don't think that will work since id in your reports is an observable.

You should use filter.

_.filter(reports(), function(item) {return id() == data.ReportId; })

Answer 2

If the id in your reports is observable, you might need to just use filter:

var filteredReports = _.filter(reports(), function (report) {
    return report.id() === data.ReportId;
});