from accounting.models import Amount, Transaction, Posting, Account

class AccountingEncoder(json.JSONEncoder):

    def default(self, o):

        if isinstance(o, Account):

        elif isinstance(o, Transaction):

            return dict(

                __type__=o.__class__.__name__,

                date=o.date.strftime('%Y-%m-%d'),

                payee=o.payee,

                postings=o.postings,

        return json.JSONEncoder.default(self, o)

class AccountingDecoder(json.JSONDecoder):

    def __init__(self):

        json.JSONDecoder.__init__(self, object_hook=self.dict_to_object)

        if '__type__' not in d:

            return d

        _type = d.pop('__type__')