This decorator messes up pydantics BaseModel

app/main.py

@@ -1,11 +1,12 @@
 '''
 Simple Geolocation with FastAPI
 '''
+import dataclasses
 from ipaddress import IPv4Address, IPv4Network, IPv6Address, IPv6Network
 from typing import Annotated, Optional, Union
 
 import geoip2.database
-from fastapi import FastAPI, Path, Body
+from fastapi import FastAPI, Path
 from pydantic import BaseModel
 
 app = FastAPI()
@@ -13,9 +14,6 @@ app = FastAPI()
 GEOLITE2_ASN_DB = '/usr/local/share/GeoIP/GeoLite2-ASN.mmdb'
 GEOLITE2_CITY_DB = '/usr/local/share/GeoIP/GeoLite2-City.mmdb'
 
-class IPAddressParam(BaseModel):
-    ip: Union[IPv6Address,IPv4Address]
-
 class Locality(BaseModel):
     '''
     Locality data
@@ -35,18 +33,20 @@ class GeoLocation(BaseModel):
     network: Union[IPv6Network,IPv4Network,None]
     locality: Locality
 
-@app.post("/")
+@app.get("/{ipaddress}")
-async def root_post(ipaddresses: Annotated[list[IPAddressParam],
+async def root(ipaddress: Annotated[Union[IPv4Address,IPv6Address],
-                                    Body(title="The IPAddresses to geolocate")]
+                                    Path(title="The IPAddress to geolocate")]
-               ) -> list[GeoLocation]:
+               ) -> GeoLocation:
-    geolocations = []
+    '''
+    Look up geolocation for ip in path parameter
+    '''
     with (geoip2.database.Reader(GEOLITE2_ASN_DB) as reader_asn,
             geoip2.database.Reader(GEOLITE2_CITY_DB) as reader_city):
-        for ipaddress in ipaddresses:
+        asn_data = reader_asn.asn(ipaddress)
-            asn_data = reader_asn.asn(ipaddress.ip)
+        city_data = reader_city.city(ipaddress)
-            city_data = reader_city.city(ipaddress.ip)
+
-            geolocations.append(GeoLocation(
+        return GeoLocation(
-                ip=ipaddress.ip,
+            ip=ipaddress,
             asn=asn_data.autonomous_system_number,
             asn_org=asn_data.autonomous_system_organization,
             network=asn_data.network,
@@ -56,15 +56,4 @@ async def root_post(ipaddresses: Annotated[list[IPAddressParam],
                 continent=city_data.continent.code,
                 is_eu=city_data.country.is_in_european_union
             )
-            ))
+        )
-    return geolocations
-
-
-@app.get("/{ipaddress}")
-async def root_get(ipaddress: Annotated[Union[IPv4Address,IPv6Address],
-                                    Path(title="The IPAddress to geolocate")]
-               ) -> GeoLocation:
-    '''
-    Look up geolocation for ip in path parameter
-    '''
-    return (await root_post([IPAddressParam(ip=ipaddress)])).pop()