query and querystring are mutually exclusive

Author: karenetheridge

src/schemas/validation/schema.yaml

@@ -298,6 +298,18 @@ $defs:
         type: array
         items:
           $ref: '#/$defs/parameter-or-reference'
+        not:
+          allOf:
+            - contains:
+                type: object
+                properties:
+                  in:
+                    const: query
+            - contains:
+                type: object
+                properties:
+                  in:
+                    const: querystring
       requestBody:
         $ref: '#/$defs/request-body-or-reference'
       responses:

tests/schema/fail/parameter-object-query-with-querystring.yaml

@@ -0,0 +1,20 @@
+openapi: 3.2.0
+info:
+  title: API
+  version: 1.0.0
+components:
+  pathItems:
+    my-path-item:
+      get:
+        description: a query parameter cannot be used together with a querystring parameter
+        parameters:
+          - name: myquerystring
+            in: querystring
+            content:
+              application/json:
+                schema:
+                  type: string
+          - name: myquery
+            in: query
+            schema:
+              type: string