uranusjr commented on pull request #21815:
URL: https://github.com/apache/airflow/pull/21815#issuecomment-1050548246
This gets me pass the error, but hits another one:
```
Traceback (most recent call last):
File "dags/t.py", line 23, in <module>
target_time=templates_xcomarg
File "/opt/airflow/airflow/models/mappedoperator.py", line 215, in apply
end_date=end_date,
File "<attrs generated init
airflow.models.mappedoperator.MappedOperator>", line 24, in __init__
File "/opt/airflow/airflow/models/mappedoperator.py", line 259, in
__attrs_post_init__
self._validate_argument_count()
File "/opt/airflow/airflow/models/mappedoperator.py", line 300, in
_validate_argument_count
op = self._create_unmapped_operator(mapped_kwargs=mocked_mapped_kwargs,
real=False)
File "/opt/airflow/airflow/models/mappedoperator.py", line 453, in
_create_unmapped_operator
**mapped_kwargs,
File "/opt/airflow/airflow/models/baseoperator.py", line 374, in
apply_defaults
result = func(self, **kwargs, default_args=default_args)
File "/opt/airflow/airflow/sensors/date_time.py", line 69, in __init__
f"Expected str or datetime.datetime type for target_time. Got
{type(target_time)}"
TypeError: Expected str or datetime.datetime type for target_time. Got
<class 'unittest.mock.MagicMock'>
```
I guess we do need a class-level `validate` hook on operators.
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