ashb commented on PR #24486:
URL: https://github.com/apache/airflow/pull/24486#issuecomment-1237975398
I've found an easy way to make sure all models are loaded when needed:
```
event.listen(sqlalchemy.orm.mapper, "before_configured",
import_all_models, once=True)
```
This will ensure that on the first time any model class is queried or
instantiated all other models will be loaded, which ensures we don't get the
"class not found in registry" error message, but still means imports are
"quick".
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