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One potential way around this is to construct your own dictionary object based on the returns of a queryset. You’d do something like this:
queryset = MyModel.objects.all()
list = [] #create list
for row in queryset: #populate list
list.append({'celular':row.celular, 'logo': row.logo, 'tipo': row.tipo.id})
list_json = json.dumps(list) #dump list as JSON
return HttpResponse(list_json, 'application/javascript')
Source:stackexchange.com