[somiljain2006]

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• Have you followed the guidelines stated in [CONTRIBUTING.md](https://github.com/reflex-dev/reflex/blob/main/CONTRIBUTING.md) file?
• Have you checked to ensure there aren't any other open [Pull Requests](https://github.com/reflex-dev/reflex/pulls) for the desired change?

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

New Feature Submission:

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Changes To Core Features:

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Description

This change prevents plain Python properties on Pydantic models and dataclasses from being treated as accessible Reflex Vars when those properties are not included in the serialized output. Accessing such properties could generate a frontend reference to a value that does not exist in the serialized object, resulting in undefined at runtime.

The change provides a clear error for unsupported properties while preserving access to declared fields and Pydantic computed_field values. Regression tests cover both Pydantic models and dataclasses.

Closes #7633

[greptile-apps]

Confidence Score: 5/5

[Medium impact] The latest change appears safe to merge; it preserves the explicit typing.Union regression test.

Summary

The PR rejects plain properties omitted from serialized Pydantic models and dataclasses while preserving computed fields and custom model serializers.

• State-variable access rejects properties missing from serialized objects.

_{Reviews (4) · Last reviewed commit: "Update tests/units/vars/test_object.py" · Reviewed by Greptile}

[cubic-dev-ai]

All reported issues were addressed across 3 files

<sub>Reply to a comment to ask cubic a question or push back. It learns from your replies.

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[cubic-dev-ai]

All reported issues were addressed across 3 files (changes from recent commits).

<sub>Reply with feedback, questions, or to request a fix.

View guided diff | Re-trigger cubic</sub>