Fix for Reusable request bodies are not handled correctly #2747

src/NSwag.Core.Tests/Serialization/ExternalReferenceTests.cs

@@ -28,8 +28,9 @@ public async Task When_file_contains_requestBody_reference_to_another_file_it_is
             var document = await OpenApiDocument.FromFileAsync("TestFiles/requestBody-reference.json");
 
             Assert.NotNull(document);
-            Assert.Equal("External request body", document.Paths.First().Value.Values.First().RequestBody.ActualRequestBody.Description);
-        }
+			Assert.Equal("External request body", document.Paths.First().Value.Values.First().RequestBody.ActualRequestBody.Description);
+			Assert.Equal("External request body", document.Paths.First().Value.Values.First().ActualParameters[0].Description);
+		}
 
         [Fact]
         public async Task When_file_contains_response_reference_to_another_file_it_is_loaded()

src/NSwag.Core/OpenApiOperation.cs

@@ -384,12 +384,12 @@ private OpenApiParameter CreateBodyParameter()
         private void UpdateBodyParameter(OpenApiParameter parameter)
         {
             parameter.Kind = OpenApiParameterKind.Body;
-            parameter.Name = RequestBody.ActualName;
-            parameter.Position = RequestBody.Position;
-            parameter.Description = RequestBody.Description;
-            parameter.IsRequired = RequestBody.IsRequired;
-            parameter.Example = RequestBody._content.FirstOrDefault().Value?.Example;
-            parameter.Schema = RequestBody._content.FirstOrDefault().Value?.Schema;
+            parameter.Name = ActualRequestBody.ActualName;
+            parameter.Position = ActualRequestBody.Position;
+            parameter.Description = ActualRequestBody.Description;
+            parameter.IsRequired = ActualRequestBody.IsRequired;
+            parameter.Example = ActualRequestBody.Content.FirstOrDefault().Value?.Example;
+            parameter.Schema = ActualRequestBody.Content.FirstOrDefault().Value?.Schema;
         }
 
         private void UpdateRequestBody(NotifyCollectionChangedEventArgs args)

src/NSwag.Core/OpenApiRequestBody.cs

@@ -41,9 +41,22 @@ public OpenApiRequestBody()
 
                 ParentOperation?.UpdateBodyParameter();
             };
+
             _content = content;
         }
 
+        /// <summary>Gets or sets the referenced object.</summary>
+        [JsonIgnore]
+        public override OpenApiRequestBody Reference
+        {
+            get => base.Reference;
+            set
+            {
+                base.Reference = value;
+                ParentOperation?.UpdateBodyParameter();
+            }
+        }
+
         [JsonIgnore]
         internal object Parent { get; set; }