Do not duplicate metadata on model rebuild #11902
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Viicos
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CodSpeed Performance ReportMerging #11902 will not alter performanceComparing Summary
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Viicos
commented
May 22, 2025
Comment on lines
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| def _copy(self) -> Self: | ||
| copied = copy(self) | ||
| for attr_name in ('metadata', '_attributes_set', '_qualifiers'): | ||
| # Apply "deep-copy" behavior on collections attributes: | ||
| value = getattr(copied, attr_name).copy() | ||
| setattr(copied, attr_name, value) | ||
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| return copied |
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We can't define a custom __copy__(), because I couldn't find a way to delegate to copy.copy() and then apply the special case for metadata, _attributes_set and _qualifiers.
The following could still be done:
def __copy__(self) -> Self:
cls = type(self)
copied = cls()
for attr_name in cls.__slots__:
value = getattr(self, attr_name)
if attr_name in ('metadata', '_attributes_set', '_qualifiers'):
# Apply "deep-copy" behavior on collections attributes:
value = value.copy()
setattr(copied, attr_name, value)
return copiedBut this blows up on libraries (FastAPI/SQLModel) subclassing FieldInfo (not the first time this is causing issues..) as we don't know which extra attributes are defined on these classes.
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Change Summary
This is a stripped down version of #11898, as a backport to 2.11. In 2.11, a change in the model rebuild logic surfaced an issue with
FieldInfobeing wrongly mutated and copied properly, resulting in a regression.#11898 is a proper refactor, but can't be fully backported as it would be too risky as a patch release.
Fixes (for 2.11) #11870.
Third-party tests output.
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