enforce exactly-one-set constraint on model fields in class types.Part
#681
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Add a Pydantic V2
@model_validatorto the existinggenai.types.Partmodel to enforce data integrity.This validator ensures that exactly one of the specified optional fields (e.g.,
field_a,field_b,field_c) has a value other than None. If zero or more than one field is set during validation, aValueErroris now raised.This refactoring improves the robustness of the model by explicitly enforcing the intended single-choice rule.