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fix(spectral): catch oneOf without discriminator at all schema depths #521

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pengying merged 1 commit into from
May 29, 2026
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fix(spectral): catch oneOf without discriminator at all schema depths #521

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11 changes: 7 additions & 4 deletions .spectral.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -61,12 +61,15 @@ rules:
# Discriminators and Polymorphism (README: OpenAPI Best Practices)
# ============================================================

# oneOf must include a discriminator
# oneOf must include a discriminator (anywhere it appears — top-level
# schemas, properties, request/response bodies). oneOf implies a tagged
# union; for nullable values use anyOf instead.
oneOf-must-have-discriminator:
description: oneOf schemas must include a discriminator
message: "oneOf without a discriminator. See openapi/README.md#discriminators-and-polymorphism"
severity: warn
given: "$.components.schemas[?(@.oneOf)]"
message: "oneOf without a discriminator. Use anyOf for non-tagged unions (e.g. nullable values). See openapi/README.md#discriminators-and-polymorphism"
severity: error
resolved: false
given: "$..*[?(@ && @.oneOf)]"
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then:
field: discriminator
function: truthy
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