Airflow 元组索引在XCom中超出范围

我正在使用Airflow和XCOM，希望从函数返回多个值，但是，我面临着这个问题。以下是我的代码：

def authenticate_api():
    #Define the global variables
    # API authentication
    url = 'odoo'
    db = 'db'
    username = 'admin'
    password = 'user'
    logging.info("Variables assigned")

    common = xmlrpclib.ServerProxy('{}/xmlrpc/2/common'.format(url))
    uid = common.authenticate(db, username, password, {})
    models = xmlrpclib.ServerProxy('{}/xmlrpc/2/object'.format(url))

    return db, models, uid, password

def get_max_date_from_odoo(**context):
    # Variables
    list = []
    list2 = []
    db = context['task_instance'].xcom_pull(key=None, task_ids='authenticate_api')
    models = context['task_instance'].xcom_pull(key=None, task_ids='authenticate_api')
    uid = context['task_instance'].xcom_pull(key=None, task_ids='authenticate_api')
    password = context['task_instance'].xcom_pull(key=None, task_ids='authenticate_api')

    #Get the customer id and date to use in the query
    datesandids = models.execute_kw(db, uid, password,
        'res.partner', 'search_read',
        [[['is_company', '=', False]]],
        {'fields': ['x_customer_register_date', 'x_customer_id']})

它返回：

('database', <ServerProxy for odoo069/xmlrpc/2/object>, 1, '1234')

---

您将返回包含所有值的元组，并将其分配给所有变量，而不是获取单个值

试试这个：

def get_max_date_from_odoo(**context):
    # Variables
    list = []
    list2 = []
    db, models, uid, password = context['task_instance'].xcom_pull(key=None, task_ids='authenticate_api')
   ...

这应该可以节省您点击数据库4次以获得相同的值

或者，因为我们不确定从XCOM返回的类型（预期的元组，可以是json编码的）

---

我看到了索引器，但您不能调用

int（params[1]）

，因为

params[1]=

def get_max_date_from_odoo(**context):
    # Variables
    list = []
    list2 = []
    db, models, uid, password = context['task_instance'].xcom_pull(key=None, task_ids='authenticate_api')
   ...

def get_max_date_from_odoo(**context):
    # Variables
    list = []
    list2 = []
    values = context['task_instance'].xcom_pull(key=None, task_ids='authenticate_api')
    if isinstance(values, tuple):
        db, models, uid, password = values
    elif isinstance(values, str):
        import json
        values = json.loads(values)
        db, models, uid, password = values