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Pydantic · Type Alias

Discriminator

Discriminator selects the correct member of a union by using a field name or a callable. A callable discriminator works with Tag values that map returned tags to union cases.

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Syntax

Discriminator(discriminator, custom_error_type=None, custom_error_message=None, custom_error_context=None)

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  • Tag
  • Field
  • Annotated
  • Union
  • Literal
  • BaseModel

Source: Pydantic Types. Checked 2026-11-03.