Unsupported lookup 'istartwith' for CharField or join on the field not permitted

This code is incorrect :

Feed.objects.filter(location__areaHash__istartwith='*****')

Try :

Feed.objects.filter(location__areaHash__istartswith='*****')

Another Workaround could be using icontains (keeping case-insensitivity as @shacker noticed) :

Feed.objects.filter(location__areaHash__icontains='*****')

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