AJAX helper function for storing credit card transaction categories, from my personal finance mini-hackathon http://ollieglass.com/2013/01/30/personal-finance-mini-hackathon

AJAX helper function for storing credit card transaction categories.py

def transaction(request):
    transaction_id = request.REQUEST.get('transactionId')
    category_id = request.REQUEST.get('categoryId')

    t = Transaction.objects.get(pk=transaction_id)
    m = t.merchant
    c = Category.objects.get(pk=category_id)

    m.category = c
    m.save()

    data = {
        'merchant': m.name,
        'category': c.name
    }
    return HttpResponse(json.dumps(data), content_type="application/json")