python flask model 序列化

class DictSerializable(object):

    def as_dict(self,*args):

        result = OrderedDict()

        keys=args or self.__mapper__.c.keys()

        for key in keys:

            if hasattr(self,key):

                obj=getattr(self, key)

                if isinstance(obj,basestring):

                    value=obj

                elif isinstance(obj,int) or isinstance(obj,long) or isinstance(obj,float):

                    value=obj

                elif isinstance(obj,Decimal):

                    value=str(obj)

                elif isinstance(obj,types.choice.Choice):

                    value=obj.code

                elif isinstance(obj,datetime):

                    value=obj.strftime('%Y-%m-%d %M:%H:%S')

                elif isinstance(obj,date):

                    value=obj.strftime('%Y-%m-%d')

                else:

                    raise Exception('不支持系列化[%s]类型!' % type(obj))

                result[key] = value



        return result



    def as_json(self,*args):

        d=self.as_dict(*args)

return json.dumps(d)

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result1=pagination(page,rows1)

    for credit in result1:

        rows.append(credit.as_dict('id','title','week_rule','latefee_rate','extra_cost_rate','due_days','remark'))

      

return json.dumps(credit_result)