fix: resolve artifact refs in flattened multi-image items#51
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…items
`_flatten_grouped_image_items` produces a flat list whose elements can
still be artifact refs (``{"path": ...}`` shapes) when the upstream
result expression returned grouped lists. The downstream image-fetch
loop expects either a PIL image or a URL/path string and raises when
it sees a dict, so multi-image rows fail with an opaque validation
error.
Hoist the upstream context/root-node bindings out of the ``expr``
branch and re-run ``maybe_resolve_artifact_ref`` over the flattened
items before the fetch loop. When ``items`` came from a literal list
the bindings stay ``None`` and ``maybe_resolve_artifact_ref`` is a
no-op, so non-vision callers are unaffected.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Signed-off-by: Zhengyuan Su <su.zhengyuan@u.nus.edu>
timzsu
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timzsu
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Signed-off-by: Zhengyuan Su <su.zhengyuan@u.nus.edu>
kaiitunnz
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May 16, 2026
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Overall looks good. I only have a small question.
| if fetch_images: | ||
| items, image_group_sizes = self._flatten_grouped_image_items(items) | ||
| items = [ | ||
| maybe_resolve_artifact_ref(item, context, root_node) |
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If we call maybe_resolve_artifact_ref here, is the call on line 422 still needed?
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Purpose
Fix multi-image vision inputs when grouped upstream artifact refs are flattened before image loading.
Changes
src/worker/executors/mixins/data.py— re-resolve flattened{path: ...}image artifact refs before fetching images.tests/worker/test_data_mixin_lineage.py— add a regression test for grouped image artifact refs from an upstream expression.Design
Keep the existing image fetch path unchanged. The fix only converts flattened artifact refs into the local path or URL shape that path already expects.
Test Plan
uv run pytest tests/worker/test_data_mixin_lineage.pyuv run ruff check tests/worker/test_data_mixin_lineage.pyuv run mypy tests/worker/test_data_mixin_lineage.pyTest Result
All targeted checks passed. Pre-commit hooks also passed when committing.
Pre-submission Checklist
pre-commit run --all-filesand fixed any issues.uv run pytest tests/passes locally.uv sync --all-packages --group ci --frozen).[BREAKING]and described migration steps above.