generate empty responses in openapi when res is missing

Author: WojtekKarwacki

src/lib/open_api/operation.rs

@@ -10,6 +10,7 @@ use crate::lib::{
 use http::Method;
 use indexmap::IndexMap;
 use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
 use typetag::serde;
 
 #[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
@@ -50,18 +51,31 @@ impl Operation {
                         .req
                         .as_ref()
                         .map(|req| RefOr::Item(RequestBody::of(req, context))),
-                    responses: op
-                        .res
-                        .as_ref()
-                        .iter()
-                        .map(|res| {
+                    responses: {
+                        if let Some(res) = op.res.as_ref() {
                             let status_code = StatusCode::of(method.clone());
-                            (
+                            let mut map = IndexMap::new();
+
+                            map.insert(
                                 status_code.clone(),
                                 RefOr::Item(Response::of(res, status_code, context)),
-                            )
-                        })
-                        .collect(),
+                            );
+
+                            map
+                        } else {
+                            let status_code = StatusCode { val: http::StatusCode::NO_CONTENT };
+                            let response = Response {
+                                description: "No Content".into(),
+                                content: None,
+                                headers: HashMap::new(),
+                            };
+
+                            let mut map = IndexMap::new();
+                            map.insert(status_code, RefOr::Item(response));
+
+                            map
+                        }
+                    },
                 }
             })
     }

src/lib/test/op-params-open-api.yml

@@ -64,6 +64,9 @@ paths:
               $ref: '#/components/schemas/SomeEnum'
             default: [first-val]
       operationId: op0Gett
+      responses:
+        "204":
+          description: No Content
     post:
       tags:
         - op-params-trust
@@ -88,6 +91,9 @@ paths:
             type: string
           required: true
       operationId: op1Postt
+      responses:
+        "204":
+          description: No Content
     parameters:
       - in: cookie
         name: commonCookieParam0