Sync fastapi docs from b5ca1324 on 2025-12-07

tests/test_duplicate_models_openapi.py

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+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Model(BaseModel):
+    pass
+
+
+class Model2(BaseModel):
+    a: Model
+
+
+class Model3(BaseModel):
+    c: Model
+    d: Model2
+
+
+@app.get("/", response_model=Model3)
+def f():
+    return {"c": {}, "d": {"a": {}}}
+
+
+client = TestClient(app)
+
+
+def test_get_api_route():
+    response = client.get("/")
+    assert response.status_code == 200, response.text
+    assert response.json() == {"c": {}, "d": {"a": {}}}
+
+
+def test_openapi_schema():
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == {
+        "openapi": "3.1.0",
+        "info": {"title": "FastAPI", "version": "0.1.0"},
+        "paths": {
+            "/": {
+                "get": {
+                    "summary": "F",
+                    "operationId": "f__get",
+                    "responses": {
+                        "200": {
+                            "description": "Successful Response",
+                            "content": {
+                                "application/json": {
+                                    "schema": {"$ref": "#/components/schemas/Model3"}
+                                }
+                            },
+                        }
+                    },
+                }
+            }
+        },
+        "components": {
+            "schemas": {
+                "Model": {"title": "Model", "type": "object", "properties": {}},
+                "Model2": {
+                    "title": "Model2",
+                    "required": ["a"],
+                    "type": "object",
+                    "properties": {"a": {"$ref": "#/components/schemas/Model"}},
+                },
+                "Model3": {
+                    "title": "Model3",
+                    "required": ["c", "d"],
+                    "type": "object",
+                    "properties": {
+                        "c": {"$ref": "#/components/schemas/Model"},
+                        "d": {"$ref": "#/components/schemas/Model2"},
+                    },
+                },
+            }
+        },
+    }