- fixes a bug where the conversion would ommit the schema type

Author: baywet

src/Microsoft.OpenApi.Readers/V2/OpenApiOperationDeserializer.cs

@@ -3,6 +3,7 @@
 
 using System.Collections.Generic;
 using System.Linq;
+using System.Security.Cryptography.X509Certificates;
 using Microsoft.OpenApi.Any;
 using Microsoft.OpenApi.Extensions;
 using Microsoft.OpenApi.Models;
@@ -171,6 +172,8 @@ private static OpenApiRequestBody CreateFormBody(ParsingContext context, List<Op
                     k => k,
                     _ => mediaType)
             };
+            foreach(var value in formBody.Content.Values.Where(static x => x.Schema is not null && x.Schema.Properties.Any() && string.IsNullOrEmpty(x.Schema.Type)))
+                value.Schema.Type = "object";
 
             return formBody;
         }

src/Microsoft.OpenApi/Models/OpenApiParameter.cs

@@ -336,7 +336,7 @@ public void SerializeAsV2WithoutReference(IOpenApiWriter writer)
             // In V2 parameter's type can't be a reference to a custom object schema or can't be of type object
             // So in that case map the type as string.
             else
-            if (Schema?.UnresolvedReference == true || Schema?.Type == "object")
+            if (Schema?.UnresolvedReference == true || "object".Equals(Schema?.Type, StringComparison.OrdinalIgnoreCase))
             {
                 writer.WriteProperty(OpenApiConstants.Type, "string");
             }

test/Microsoft.OpenApi.Readers.Tests/V2Tests/OpenApiOperationTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Text;
@@ -80,6 +81,7 @@ public class OpenApiOperationTests
                         {
                             Schema = new()
                             {
+                                Type = "object",
                                 Properties =
                                 {
                                     ["name"] = new()
@@ -103,6 +105,7 @@ public class OpenApiOperationTests
                         {
                             Schema = new()
                             {
+                                Type = "object",
                                 Properties =
                                 {
                                     ["name"] = new()

test/Microsoft.OpenApi.Readers.Tests/V2Tests/OpenApiPathItemTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -67,6 +68,7 @@ public class OpenApiPathItemTests
                             {
                                 Schema = new()
                                 {
+                                    Type = "object",
                                     Properties =
                                     {
                                         ["name"] = new()
@@ -90,6 +92,7 @@ public class OpenApiPathItemTests
                             {
                                 Schema = new()
                                 {
+                                    Type = "object",
                                     Properties =
                                     {
                                         ["name"] = new()
@@ -171,6 +174,7 @@ public class OpenApiPathItemTests
                             {
                                 Schema = new()
                                 {
+                                    Type = "object",
                                     Properties =
                                     {
                                         ["name"] = new()
@@ -199,6 +203,7 @@ public class OpenApiPathItemTests
                             {
                                 Schema = new()
                                 {
+                                    Type = "object",
                                     Properties =
                                     {
                                         ["name"] = new()