Formatting a date with a nested key

[jhyland87]

Hello,

I have two dates that I'm trying to format, they're being pulled from a model (called timeline), which is structured like so:

[
    {
        "duration":{
            "begin": "2014-10-01",
            "end": "2015-02-25"
        }
    }
    // Repeat..
]

So, as you can see, the dates are nested inside the duration object. I use Handlebars templating to display the dates:

{{#each model.timeline}}
    <span>{{duration.begin}}</span>
    <span>{{duration.end}}</span>
{{/each}}

The problem I'm having, is the date-formatter doesn't seem to accept a key value of an object item. I've tried the following:

const dateFormatter = require('metalsmith-date-formatter')
const metalsmith = Metalsmith(__dirname)

metalsmith
    // .. cut..
    .use(dateFormatter({
        dates: [{
            key: 'duration.begin',
            format: 'MM YYYY'
        },{
            key: 'begin',
            format: 'MM YYYY'
        },{
            key: 'duration.end',
            format: 'MM YYYY'
        },{
            key: 'end',
            format: 'MM YYYY'
        }]
    }))
    // .. cut..
    .build(function(err, files) {
        if (err) throw err

        console.log('Build Completed')
    })

None of which work. If I move both the duration.begin and duration.end to the top level, and set the key value(s) to begin and end, then it works fine. But I need them to be values inside an object..

Is there a way around this? Am I just doing something wrong? I looked through the unit tests in the repo and I didn't see anything that would help out.

Thanks!