✨ Add support for dataclasses in request bodies and response_model (#3577)

docs_src/dataclasses/tutorial002.py

@@ -0,0 +1,26 @@
+from dataclasses import dataclass, field
+from typing import List, Optional
+
+from fastapi import FastAPI
+
+
+@dataclass
+class Item:
+    name: str
+    price: float
+    tags: List[str] = field(default_factory=list)
+    description: Optional[str] = None
+    tax: Optional[float] = None
+
+
+app = FastAPI()
+
+
+@app.get("/items/next", response_model=Item)
+async def read_next_item():
+    return {
+        "name": "Island In The Moon",
+        "price": 12.99,
+        "description": "A place to be be playin' and havin' fun",
+        "tags": ["breater"],
+    }