[GitHub] [airflow] Guilherme-B commented on issue #18116: Methods `TaskInstance.get_previous_execution_date()` & `TaskInstance.get_previous_ti()` are lying !

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

Guilherme-B commented on issue #18116:
URL: https://github.com/apache/airflow/issues/18116#issuecomment-1183384880

   Should anyone require, I was experiencing the same problem and this is how I approached it:
   
   ```
   @provide_session
   def get_previous_ti_by_state(task_instance: TaskInstance, task_state: TaskInstanceState, session: Session = NEW_SESSION) -> TaskInstance:
       # retrieve the latest Task Instance model whose TaskInstanceState corresponds to the specified task instance state
       return session.query(TaskInstance).filter_by(state=task_state, task_id=task_instance.task_id).order_by(TaskInstance.start_date.desc()).first()
   
   @provide_session
   def get_previous_ti_success(task_instance: TaskInstance, session: Session = NEW_SESSION) -> TaskInstance:
       return get_previous_ti_by_state(task_instance=task_instance, task_state=TaskInstanceState.SUCCESS, session=session)
   ```


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