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Graph/42657bbb-8acc-430b-ae09-3576a683fc94

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FastAPI does not know about Lizard, Dog and Cat schemas in OpenAPI

42657bbb-8acc-430b-ae09-3576a683fc94

FastAPI does not know about Lizard, Dog and Cat schemas in OpenAPI

Node Details

Public graph metadata

Updated4/30/2026

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12 linked nodes

DESCRIBESQuestion

CAUSED_BYRootCause

Pydantic v2 uses model_json_schema(), while schema() no longer generates the needed schema for RootModel unions with discriminators

FIXED_BYSolution

Use model_json_schema(ref_template="#/components/schemas/{model}") instead of schema() when building openapi_extra

ESCALATES_TOProblem

I need to upload it to an app, which does not support schemas that have been defined using `anyOf`, `allOf` or `OneOf`. — openapi.json, which has been automatically created by FastAPI (version 0.109.0). Outcome: It looks like the error is coming from the third `parameter` definition and the use of `allOf`.

PERTAIN_TODomain

PERTAIN_TODomain

Swagger UI Null Semantics

FastAPI Dependency Currying

DTO Mapping Mismatch

DTO Mapping for Nested Models

DTO Mapping for Nested Lists

FastAPI Dependency 422 Failures

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