mirror of https://github.com/tiangolo/fastapi.git
✅ Add test for union with discriminator
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Sebastián Ramírez
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1fcec88ad2
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# Ref: https://github.com/fastapi/fastapi/discussions/14495
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from typing import Union
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import pytest
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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
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from typing_extensions import Annotated
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from .utils import needs_pydanticv2
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@pytest.fixture(name="client")
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def client_fixture() -> TestClient:
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from fastapi import Body
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from pydantic import Discriminator, Tag
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class Cat(BaseModel):
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pet_type: str = "cat"
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meows: int
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class Dog(BaseModel):
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pet_type: str = "dog"
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barks: float
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def get_pet_type(v):
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if isinstance(v, dict):
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return v.get("pet_type", "")
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return getattr(v, "pet_type", "")
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Pet = Annotated[
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Union[Annotated[Cat, Tag("cat")], Annotated[Dog, Tag("dog")]],
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Discriminator(get_pet_type),
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]
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app = FastAPI()
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@app.post("/pet/assignment")
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async def create_pet_assignment(pet: Pet = Body()):
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return pet
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@app.post("/pet/annotated")
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async def create_pet_annotated(pet: Annotated[Pet, Body()]):
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return pet
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client = TestClient(app)
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return client
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@needs_pydanticv2
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def test_union_body_discriminator_assignment(client: TestClient) -> None:
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response = client.post("/pet/assignment", json={"pet_type": "cat", "meows": 5})
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assert response.status_code == 200, response.text
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assert response.json() == {"pet_type": "cat", "meows": 5}
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@needs_pydanticv2
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def test_union_body_discriminator_annotated(client: TestClient) -> None:
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response = client.post("/pet/annotated", json={"pet_type": "dog", "barks": 3.5})
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assert response.status_code == 200, response.text
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assert response.json() == {"pet_type": "dog", "barks": 3.5}
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@needs_pydanticv2
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def test_openapi_schema(client: TestClient) -> None:
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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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"/pet/assignment": {
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"post": {
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"summary": "Create Pet Assignment",
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"operationId": "create_pet_assignment_pet_assignment_post",
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"requestBody": {
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"content": {
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"application/json": {
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"schema": {
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"anyOf": [
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{"$ref": "#/components/schemas/Cat"},
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{"$ref": "#/components/schemas/Dog"},
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],
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"title": "Pet",
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}
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}
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},
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"required": True,
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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": {"application/json": {"schema": {}}},
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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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"$ref": "#/components/schemas/HTTPValidationError"
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}
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}
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},
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},
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},
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}
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},
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"/pet/annotated": {
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"post": {
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"summary": "Create Pet Annotated",
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"operationId": "create_pet_annotated_pet_annotated_post",
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"requestBody": {
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"content": {
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"application/json": {
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"schema": {
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"oneOf": [
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{"$ref": "#/components/schemas/Cat"},
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{"$ref": "#/components/schemas/Dog"},
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],
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"title": "Pet",
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}
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}
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},
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"required": True,
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},
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"responses": {
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"200": {
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"description": "Successful Response",
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"content": {"application/json": {"schema": {}}},
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},
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"422": {
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"description": "Validation Error",
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"content": {
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"application/json": {
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"schema": {
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"$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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"Cat": {
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"properties": {
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"pet_type": {
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"type": "string",
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"title": "Pet Type",
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"default": "cat",
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},
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"meows": {"type": "integer", "title": "Meows"},
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},
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"type": "object",
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"required": ["meows"],
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"title": "Cat",
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},
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"Dog": {
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"properties": {
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"pet_type": {
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"type": "string",
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"title": "Pet Type",
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"default": "dog",
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},
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"barks": {"type": "number", "title": "Barks"},
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},
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"type": "object",
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"required": ["barks"],
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"title": "Dog",
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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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"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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