[GitHub] [airflow] turbaszek edited a comment on issue #11983: airflow.contrib.operators.pubsub_operator.PubSubPublishOperator can't handle multiple messages in a template

[GitBox <gi...@apache.org>]

turbaszek edited a comment on issue #11983:
URL: https://github.com/apache/airflow/issues/11983#issuecomment-759269669


   It seems that in 2.0 you can use `output` attribute to do what you want:
   ```py
   class CustomOp(BaseOperator):
       @apply_defaults
       def __init__(self, **kwargs):
           super().__init__(**kwargs)
   
       def execute(self, context: Any):
           return [{"a": 1, "b": 2} for _ in range(5)]
   
   
   class CustomOp2(BaseOperator):
       template_fields = ["xs"]
   
       @apply_defaults
       def __init__(self, xs, **kwargs):
           super().__init__(**kwargs)
           self.xs = xs
   
       def execute(self, context: Any):
           self.log.info(self.xs)
           for x in self.xs:
               self.log.info(x)
   
   
   with DAG(
       'test_xcom_native',
       default_args=default_args
   ) as dag2:
       op = CustomOp(task_id="generate")
       CustomOp2(task_id="print", xs=op.output)
   ```
   
   and you get:
   ```
   [2021-01-13 07:44:12,266] {xcom.py:52} INFO - [{'a': 1, 'b': 2}, {'a': 1, 'b': 2}, {'a': 1, 'b': 2}, {'a': 1, 'b': 2}, {'a': 1, 'b': 2}]
   [2021-01-13 07:44:12,267] {xcom.py:54} INFO - {'a': 1, 'b': 2}
   [2021-01-13 07:44:12,269] {xcom.py:54} INFO - {'a': 1, 'b': 2}
   [2021-01-13 07:44:12,270] {xcom.py:54} INFO - {'a': 1, 'b': 2}
   [2021-01-13 07:44:12,271] {xcom.py:54} INFO - {'a': 1, 'b': 2}
   [2021-01-13 07:44:12,272] {xcom.py:54} INFO - {'a': 1, 'b': 2}
   ```
   
   To learn more see:
   https://airflow.apache.org/docs/apache-airflow/stable/tutorial_taskflow_api.html
   https://www.polidea.com/blog/airflow-2-0-dag-authoring-redesigned/


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