访问pynamodb模型属性

Question

我有以下pynamodb模型：

from dynamo_to_AT.product import save as save_product_to_AT
from dynamo_to_AT.product import delete as delete_product_to_AT

class MasterList(Model):
    class Meta:
        region = 'us-east-1'
        table_name = 'MasterList'
        #host = "http://localhost:8000"

    pk = UnicodeAttribute(hash_key=True)
    asin = UnicodeAttribute(null=True)
    country = UnicodeAttribute(null=True)
    account = UnicodeAttribute(null=True)  
    seller_id = UnicodeAttribute(null=True)
    market_id = UnicodeAttribute(null=True)
    sku = UnicodeAttribute(null=True)
    cogl = NumberAttribute(null=True)
    cogs = NumberAttribute(null=True)
    marketplace = UnicodeAttribute(null=True)
    selling_price = NumberAttribute(null=True)
    status = UnicodeAttribute(null=True)
    launch_date = UnicodeAttribute(null=True)
    rating = NumberAttribute(null=True)
    review_count = NumberAttribute(null=True)
    expected_fulfillment_fee_per_unit = NumberAttribute(null=True)
    picture_count = NumberAttribute(null=True)
    item_volume = NumberAttribute(null=True)
    volume_rate = NumberAttribute(null=True)
    item_package_weight = NumberAttribute(null=True)
    unit_of_weight = UnicodeAttribute(null=True)
    manager = UnicodeAttribute(null=True)
    sub_category = UnicodeAttribute(null=True)
    liquidating = UnicodeAttribute(null=True)

    @staticmethod
    def column_list():
        return [
            "asin", "country", "account", "seller_id", "market_id", "sku",
            "cogl", "cogs", "marketplace", "selling_price", "status", "launch_date", "rating",
            "review_count", "expected_fulfillment_fee_per_unit", "picture_count", "item_volume",
            "volume_rate", "item_package_weight", "unit_of_weight", "manager", "sub_category", "liquidating",
        ]

    def update(self, attributes=None, actions=None, condition=None, conditional_operator=None, **expected_values):
        """
        Updates an item using the UpdateItem operation.

        :param attributes: A dictionary of attributes to update in the following format
                            {
                                attr_name: {'value': 10, 'action': 'ADD'},
                                next_attr: {'value': True, 'action': 'PUT'},
                            }
        """
        #print(attributes)
        out={
            'status':'success',
            'dynamodb':'success',
            'airtable':'success',
            'msg':''
        }
        try:
            super(MasterList, self).update(attributes, actions, condition, conditional_operator, **expected_values)
        except Exception as ex:
            out['status']='error'
            out['dynamodb']='error'
            out['msg']="Dynamodb: "+str(ex)+" \n "
        try:
            save_product_to_AT(self)
        except Exception as ex:
            out['status']='error'
            out['airtable']='error'
            out['msg']+= "Airtable: "+str(ex)+"\n"

        return out


    def delete(self, condition=None, conditional_operator=None, **expected_values):
        """
        Deletes this object from dynamodb
        """
        #print(attributes)
        out={
            'status':'success',
            'dynamodb':'success'    ,
            'airtable':'success',
            'msg':''
        }
        try:
            super(MasterList, self).delete(condition, conditional_operator, **expected_values)
        except Exception as ex:
            out['status']='error'
            out['dynamodb']='error'
            out['msg']="Dynamodb: "+str(ex)+" \n "
        try:
            delete_product_to_AT(self)
        except Exception as ex:
            out['status']='error'
            out['airtable']='error'
            out['msg']+= "Airtable: "+str(ex)+"\n"

        return out

更新方法有效，但是删除方法不允许我传递“自我” 在函数delete_prodcut_to_AT（）上 当我在函数上打印它时，它=“ None”

我在更新时使用了非常相似的功能：save_product_to_AT（self）

我可以引用“自我”

dynamo_to_AT / product.py：

def save(ddb_product):
    if ddb_product.country in US:
        #update us tables
        _save(ddb_product, AT_SETTINGS['embedded_weekly_usa'])
        # add more bases as needed
        pass
    elif ddb_product.country in CA:
        _save(ddb_product, AT_SETTINGS['embedded_weekly_can'])
        #update ca tables
        pass

def _save(ddb_product, settings):
    product_AT=Product_AT(settings['base_key'], table_name=settings['product_tbl'])

    product_AT.account=ddb_product.account
    product_AT.sku=ddb_product.sku
    product_AT.asin=ddb_product.asin



def delete(ddb_produc):
    send_error_message(ddb_produc)
    send_error_message('delete function object')
    if ddb_product.country in US:
        send_error_message('delete function us')
        #update us tables
        _delete(ddb_product, AT_SETTINGS['embedded_weekly_usa'])
        # add more bases as needed
        pass
    elif ddb_product.country in CA:
        send_error_message('delete function ca')
        _delete(ddb_product, AT_SETTINGS['embedded_weekly_can'])
        #update ca tables
        pass
def _delete(ddb_product, settings):
    try:
        product_AT=Product_AT(settings['base_key'], table_name=settings['product_tbl'])
        product_AT.account=ddb_product.account
        product_AT.sku=ddb_product.sku
        send_error_message( product_AT.delete_by_acct_sku())

如何将模型中的属性传递给'delete_prodcut_to_AT（self）'，以便self具有模型的属性，就像save（ddb_product）在ddb_product中具有它们一样，来自：save_product_to_AT（self）