gwax commented on issue #3720: [AIRFLOW-2870] Use abstract TaskInstance for
migration
URL:
https://github.com/apache/incubator-airflow/pull/3720#issuecomment-411461955
Clever approach; thanks for taking this on @bolkedebruin
On attempting `upgradedb`, I run into the following error with this branch:
```
File
"/Users/georgelesliewaksman/.pyenv/versions/2.7.15/envs/temp2/lib/python2.7/site-packages/airflow/migrations/versions/cc1e65623dc7_add_max_tries_column_to_task_instance.py",
line 98, in upgrade
ti.max_tries = ti.try_number
AttributeError: 'TaskInstance' object has no attribute 'try_number'
```
Looks like we also need the "try_number" column on the migration version of
the model:
```
try_number = Column(Integer, default=0)
```
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