Unable to bind select

I have bind in select but options are not showing.
Using the same binding in div its work fine.

<div is="dmx-repeat" dmx-bind:repeat="jsonTransactions.data.groupBy(`category_name`)">
        <div>{{$key}}</div><span>{{$value[0].category_id}}</span>
</div>
<select class="form-control" dmx-bind:options="jsonTransactions.data.groupBy(`category_name`)" optiontext="$key" optionvalue="$value[0].category_id" id="categories"></select>
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