mirror of https://github.com/tiangolo/fastapi.git
🐛 Fix tagged discriminated union not recognized as body field (#12942)
Co-authored-by: Motov Yurii <109919500+YuriiMotov@users.noreply.github.com> Co-authored-by: Patrick Arminio <patrick.arminio@gmail.com> Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
This commit is contained in:
François Voron
GitHub
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@ -590,6 +590,9 @@ def field_annotation_is_complex(annotation: Union[Type[Any], None]) -> bool:
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if origin is Union or origin is UnionType:
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return any(field_annotation_is_complex(arg) for arg in get_args(annotation))
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if origin is Annotated:
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return field_annotation_is_complex(get_args(annotation)[0])
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return (
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_annotation_is_complex(annotation)
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or _annotation_is_complex(origin)
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@ -0,0 +1,188 @@
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from typing import Any, Dict, Union
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from dirty_equals import IsDict
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from fastapi import FastAPI
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from fastapi.testclient import TestClient
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from inline_snapshot import snapshot
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from pydantic import BaseModel, Field
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from typing_extensions import Annotated, Literal
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from .utils import needs_pydanticv2
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@needs_pydanticv2
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def test_discriminator_pydantic_v2() -> None:
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from pydantic import Tag
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app = FastAPI()
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class FirstItem(BaseModel):
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value: Literal["first"]
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price: int
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class OtherItem(BaseModel):
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value: Literal["other"]
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price: float
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Item = Annotated[
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Union[Annotated[FirstItem, Tag("first")], Annotated[OtherItem, Tag("other")]],
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Field(discriminator="value"),
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]
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@app.post("/items/")
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def save_union_body_discriminator(
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item: Item, q: Annotated[str, Field(description="Query string")]
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) -> Dict[str, Any]:
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return {"item": item}
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client = TestClient(app)
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response = client.post("/items/?q=first", json={"value": "first", "price": 100})
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assert response.status_code == 200, response.text
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assert response.json() == {"item": {"value": "first", "price": 100}}
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response = client.post("/items/?q=other", json={"value": "other", "price": 100.5})
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assert response.status_code == 200, response.text
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assert response.json() == {"item": {"value": "other", "price": 100.5}}
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response = client.get("/openapi.json")
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assert response.status_code == 200, response.text
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assert response.json() == snapshot(
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{
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"openapi": "3.1.0",
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"info": {"title": "FastAPI", "version": "0.1.0"},
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"paths": {
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"/items/": {
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"post": {
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"summary": "Save Union Body Discriminator",
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"operationId": "save_union_body_discriminator_items__post",
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"parameters": [
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{
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"name": "q",
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"in": "query",
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"required": True,
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"schema": {
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"type": "string",
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"description": "Query string",
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"title": "Q",
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},
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}
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],
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"requestBody": {
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"required": True,
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"content": {
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"application/json": {
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"schema": {
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"oneOf": [
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{"$ref": "#/components/schemas/FirstItem"},
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{"$ref": "#/components/schemas/OtherItem"},
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],
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"discriminator": {
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"propertyName": "value",
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"mapping": {
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"first": "#/components/schemas/FirstItem",
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"other": "#/components/schemas/OtherItem",
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},
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},
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"title": "Item",
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}
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}
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},
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},
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"responses": {
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"200": {
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"description": "Successful Response",
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"content": {
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"application/json": {
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"schema": IsDict(
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{
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# Pydantic 2.10, in Python 3.8
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# TODO: remove when dropping support for Python 3.8
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"type": "object",
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"title": "Response Save Union Body Discriminator Items Post",
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}
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)
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| IsDict(
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{
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"type": "object",
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"additionalProperties": True,
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"title": "Response Save Union Body Discriminator Items Post",
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}
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)
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}
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},
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},
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"422": {
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"description": "Validation Error",
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"content": {
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"application/json": {
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"schema": {
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"$ref": "#/components/schemas/HTTPValidationError"
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}
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}
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},
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},
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},
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}
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}
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},
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"components": {
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"schemas": {
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"FirstItem": {
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"properties": {
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"value": {
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"type": "string",
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"const": "first",
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"title": "Value",
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},
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"price": {"type": "integer", "title": "Price"},
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},
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"type": "object",
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"required": ["value", "price"],
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"title": "FirstItem",
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},
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"HTTPValidationError": {
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"properties": {
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"detail": {
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"items": {
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"$ref": "#/components/schemas/ValidationError"
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},
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"type": "array",
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"title": "Detail",
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}
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},
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"type": "object",
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"title": "HTTPValidationError",
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},
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"OtherItem": {
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"properties": {
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"value": {
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"type": "string",
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"const": "other",
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"title": "Value",
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},
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"price": {"type": "number", "title": "Price"},
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},
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"type": "object",
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"required": ["value", "price"],
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"title": "OtherItem",
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},
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"ValidationError": {
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"properties": {
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"loc": {
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"items": {
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"anyOf": [{"type": "string"}, {"type": "integer"}]
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},
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"type": "array",
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"title": "Location",
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},
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"msg": {"type": "string", "title": "Message"},
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"type": {"type": "string", "title": "Error Type"},
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},
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"type": "object",
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"required": ["loc", "msg", "type"],
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"title": "ValidationError",
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},
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}
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},
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}
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)
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