add useItem to createApi

src/core/createApi.js

@@ -60,6 +60,15 @@ export function createApi({
     });
   }
 
+  function useItem(id, options = {}) {
+    return useQuery({
+      queryKey: id ? getItemKey(key, id) : null,
+      queryFn: () => fetcher(`${url}${id}`),
+      enabled: Boolean(id),
+      ...options,
+    });
+  }
+
   function useAction(actionName, options = {}) {
     const queryClient = useQueryClient();
     const action = actions[actionName];
@@ -116,6 +125,7 @@ export function createApi({
     listKey,
 
     useGet,
+    useItem,
     useAction,
   };
 }