Add sub-app to generate open api spec

demo/model.py

@@ -0,0 +1,43 @@
+from pydantic import BaseModel
+
+
+class Pet(BaseModel):
+    id: int
+    name: str
+
+
+class Model:
+    """
+    To keep simple this demo, we use a simple dict as database to
+    store the models.
+    """
+
+    class NotFound(KeyError):
+        """
+        Raised when a pet is not found.
+        """
+
+    def __init__(self):
+        self.storage = {}
+
+    def add_pet(self, pet: Pet):
+        self.storage[pet.id] = pet
+
+    def remove_pet(self, id: int):
+        try:
+            del self.storage[id]
+        except KeyError as error:
+            raise self.NotFound(str(error))
+
+    def update_pet(self, id: int, pet: Pet):
+        self.remove_pet(id)
+        self.add_pet(pet)
+
+    def find_pet(self, id: int):
+        try:
+            return self.storage[id]
+        except KeyError as error:
+            raise self.NotFound(str(error))
+
+    def list_pets(self):
+        return list(self.storage.values())