feat: add support for definition in query param

tests/test_validation_query_string.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from enum import Enum
 from typing import Optional, List
 from pydantic import Field
 from aiohttp import web
@@ -54,6 +55,20 @@ class ArticleViewWithPaginationGroup(PydanticView):
         )
 
 
+class Lang(str, Enum):
+    EN = 'en'
+    FR = 'fr'
+
+
+class ArticleViewWithEnumInQuery(PydanticView):
+    async def get(self, lang: Lang):
+        return web.json_response(
+            {
+                "lang": lang
+            }
+        )
+
+
 async def test_get_article_without_required_qs_should_return_an_error_message(
     aiohttp_client, event_loop
 ):
@@ -236,6 +251,20 @@ async def test_get_article_with_page_and_page_size(aiohttp_client, event_loop):
     assert resp.content_type == "application/json"
 
 
+async def test_get_article_with_enum_in_query(aiohttp_client, event_loop):
+    app = web.Application()
+    app.router.add_view("/article", ArticleViewWithEnumInQuery)
+
+    client = await aiohttp_client(app)
+
+    resp = await client.get(
+        "/article", params={"lang": Lang.EN.value}
+    )
+    assert await resp.json() == {'lang': Lang.EN}
+    assert resp.status == 200
+    assert resp.content_type == "application/json"
+
+
 async def test_get_article_with_page_and_wrong_page_size(aiohttp_client, event_loop):
     app = web.Application()
     app.router.add_view("/article", ArticleViewWithPaginationGroup)