KushagraB424 opened a new pull request, #71016:
URL: https://github.com/apache/airflow/pull/71016
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This PR adds support for importing nested classes using the `import_string`
utility, resolving an existing `TODO`.
Currently, `import_string` strictly splits at the last dot and attempts to
import the first part as a module. This immediately throws an `ImportError` if
the dotted path points to a nested class inside another class (e.g.,
`my_module.TopLevelClass.NestedClass`).
The updated logic introduces a safe fallback mechanism. If the original
split throws an `ImportError`, it iteratively searches backwards to find the
longest valid base module path. Once the module is successfully imported, it
recursively resolves the rest of the path using `getattr()`.
This introduces no breaking changes to the default behavior. Unit tests have
been added to verify that nested classes load properly.
closes: #71014
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