evgenyshulman commented on a change in pull request #8805:
URL: https://github.com/apache/airflow/pull/8805#discussion_r422632621
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File path: airflow/models/baseoperator.py
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@@ -60,9 +60,25 @@
ScheduleInterval = Union[str, timedelta, relativedelta]
+class BaseOperatorMeta(type):
+ """
+ Base metaclass of BaseOperator.
+ """
+ def __call__(cls, *args, **kwargs):
+ """
+ Called when you call BaseOperator(). In this way we are able to
perform an action
+ after initializing an operator no matter where the
``super().__init__`` is called
+ (before or after assign of new attributes in a custom operator).
+ """
+ obj = type.__call__(cls, *args, **kwargs)
+ # Set upstream task defined by XComArgs passed to template fields of
an operator
+ obj._set_xcomargs_dependencies() # pylint: disable=protected-access
Review comment:
meta_class introduce backward compatibility problems for users who
already have metaclass defined for their operator ( they will have to inherit
from BaseOperatorMeta)
what happens when user creates operator without DAG?
1. we can fix set_upstream we can just finalize Operator implementation
when we add it to dag ( thus no metaclass is required)
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