fix: single entry one/any of merging

CHANGELOG.md

@@ -16,8 +16,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - Fixed python generation in scenarios with opening/closing tags for code comments. [#5636](https://github.com/microsoft/kiota/issues/5636)
-- Fixed Python error when a class inherits from a base class and implements an interface. [5637](https://github.com/microsoft/kiota/issues/5637)
-- Fix anyOf/oneOf generation in TypeScript. [5353](https://github.com/microsoft/kiota/issues/5353)
+- Fixed Python error when a class inherits from a base class and implements an interface. [#5637](https://github.com/microsoft/kiota/issues/5637)
+- Fixed a bug where one/any schemas with single schema entries would be missing properties. [#5808](https://github.com/microsoft/kiota/issues/5808)
+- Fixed anyOf/oneOf generation in TypeScript. [5353](https://github.com/microsoft/kiota/issues/5353)
 - Fixed invalid code in Php caused by "*/*/" in property description. [5635](https://github.com/microsoft/kiota/issues/5635)
 - Fixed TypeScript generation error when generating usings from shaken serializers. [#5634](https://github.com/microsoft/kiota/issues/5634)
 

src/Kiota.Builder/Extensions/OpenApiSchemaExtensions.cs

@@ -68,9 +68,9 @@ public static bool HasAnyProperty(this OpenApiSchema? schema)
     {
         return schema?.Properties is { Count: > 0 };
     }
-    public static bool IsInclusiveUnion(this OpenApiSchema? schema)
+    public static bool IsInclusiveUnion(this OpenApiSchema? schema, uint exclusiveMinimumNumberOfEntries = 1)
     {
-        return schema?.AnyOf?.Count(static x => IsSemanticallyMeaningful(x, true)) > 1;
+        return schema?.AnyOf?.Count(static x => IsSemanticallyMeaningful(x, true)) > exclusiveMinimumNumberOfEntries;
         // so we don't consider any of object/nullable as a union type
     }
 
@@ -89,6 +89,36 @@ public static bool IsInherited(this OpenApiSchema? schema)
         return schema.MergeIntersectionSchemaEntries(schemasToExclude, true, filter);
     }
 
+    internal static OpenApiSchema? MergeInclusiveUnionSchemaEntries(this OpenApiSchema? schema)
+    {
+        if (schema is null || !schema.IsInclusiveUnion(0)) return null;
+        var result = new OpenApiSchema(schema);
+        result.AnyOf.Clear();
+        foreach (var subSchema in schema.AnyOf)
+        {
+            foreach (var property in subSchema.Properties)
+            {
+                result.Properties.TryAdd(property.Key, property.Value);
+            }
+        }
+        return result;
+    }
+
+    internal static OpenApiSchema? MergeExclusiveUnionSchemaEntries(this OpenApiSchema? schema)
+    {
+        if (schema is null || !schema.IsExclusiveUnion(0)) return null;
+        var result = new OpenApiSchema(schema);
+        result.OneOf.Clear();
+        foreach (var subSchema in schema.OneOf)
+        {
+            foreach (var property in subSchema.Properties)
+            {
+                result.Properties.TryAdd(property.Key, property.Value);
+            }
+        }
+        return result;
+    }
+
     internal static OpenApiSchema? MergeIntersectionSchemaEntries(this OpenApiSchema? schema, HashSet<OpenApiSchema>? schemasToExclude = default, bool overrideIntersection = false, Func<OpenApiSchema, bool>? filter = default)
     {
         if (schema is null) return null;
@@ -123,9 +153,9 @@ public static bool IsIntersection(this OpenApiSchema? schema)
         return meaningfulSchemas?.Count(static x => !string.IsNullOrEmpty(x.Reference?.Id)) > 1 || meaningfulSchemas?.Count(static x => string.IsNullOrEmpty(x.Reference?.Id)) > 1;
     }
 
-    public static bool IsExclusiveUnion(this OpenApiSchema? schema)
+    public static bool IsExclusiveUnion(this OpenApiSchema? schema, uint exclusiveMinimumNumberOfEntries = 1)
     {
-        return schema?.OneOf?.Count(static x => IsSemanticallyMeaningful(x, true)) > 1;
+        return schema?.OneOf?.Count(static x => IsSemanticallyMeaningful(x, true)) > exclusiveMinimumNumberOfEntries;
         // so we don't consider one of object/nullable as a union type
     }
     private static readonly HashSet<string> oDataTypes = new(StringComparer.OrdinalIgnoreCase) {

src/Kiota.Builder/KiotaBuilder.cs

@@ -1895,6 +1895,16 @@ private CodeElement AddModelDeclarationIfDoesntExist(OpenApiUrlTreeNode currentN
                 // multiple allOf entries that do not translate to inheritance
                 return createdClass;
             }
+            else if (schema.MergeInclusiveUnionSchemaEntries() is { } iUMergedSchema &&
+                AddModelClass(currentNode, iUMergedSchema, declarationName, currentNamespace, currentOperation, inheritsFrom) is CodeClass uICreatedClass)
+            {
+                return uICreatedClass;
+            }
+            else if (schema.MergeExclusiveUnionSchemaEntries() is { } eUMergedSchema &&
+                AddModelClass(currentNode, eUMergedSchema, declarationName, currentNamespace, currentOperation, inheritsFrom) is CodeClass uECreatedClass)
+            {
+                return uECreatedClass;
+            }
             return AddModelClass(currentNode, schema, declarationName, currentNamespace, currentOperation, inheritsFrom);
         }
         return existingDeclaration;

src/Kiota.Builder/Writers/CSharp/CodeMethodWriter.cs

@@ -140,7 +140,7 @@ private void WriteFactoryMethodBodyForUnionModel(CodeMethod codeElement, CodeCla
                 }
                 else if (propertyType.TypeDefinition is CodeClass && propertyType.IsCollection || propertyType.TypeDefinition is null || propertyType.TypeDefinition is CodeEnum)
                 {
-                    var typeName = conventions.GetTypeString(propertyType, codeElement, true, false);
+                    var typeName = conventions.GetTypeString(propertyType, codeElement, true, propertyType.TypeDefinition is CodeEnum && propertyType.CollectionKind is not CodeTypeBase.CodeTypeCollectionKind.None);
                     var valueVarName = $"{property.Name.ToFirstCharacterLowerCase()}Value";
                     writer.WriteLine($"{(includeElse ? "else " : string.Empty)}if({parseNodeParameter.Name.ToFirstCharacterLowerCase()}.{GetDeserializationMethodName(propertyType, codeElement)} is {typeName} {valueVarName})");
                     writer.WriteBlock(lines: $"{ResultVarName}.{property.Name.ToFirstCharacterUpperCase()} = {valueVarName};");
@@ -161,7 +161,7 @@ private void WriteFactoryMethodBodyForIntersectionModel(CodeMethod codeElement,
         {
             if (property.Type is CodeType propertyType)
             {
-                var typeName = conventions.GetTypeString(propertyType, codeElement, true, false);
+                var typeName = conventions.GetTypeString(propertyType, codeElement, true, propertyType.TypeDefinition is CodeEnum && propertyType.CollectionKind is not CodeTypeBase.CodeTypeCollectionKind.None);
                 var valueVarName = $"{property.Name.ToFirstCharacterLowerCase()}Value";
                 writer.WriteLine($"{(includeElse ? "else " : string.Empty)}if({parseNodeParameter.Name.ToFirstCharacterLowerCase()}.{GetDeserializationMethodName(propertyType, codeElement)} is {typeName} {valueVarName})");
                 writer.WriteBlock(lines: $"{ResultVarName}.{property.Name.ToFirstCharacterUpperCase()} = {valueVarName};");

src/Kiota.Builder/Writers/Go/CodeMethodWriter.cs

@@ -195,13 +195,13 @@ private void WriteFactoryMethodBodyForIntersectionModel(CodeMethod codeElement,
                     WriteCollectionCast(propertyTypeImportName, valueVarName, "cast", writer, isInterfaceType ? string.Empty : "*", !isInterfaceType);
                     valueVarName = "cast";
                 }
-                else if (propertyType.TypeDefinition is CodeClass || propertyType.TypeDefinition is CodeInterface)
+                else if (propertyType.TypeDefinition is CodeClass || propertyType.TypeDefinition is CodeInterface || propertyType.TypeDefinition is CodeEnum)
                 {
                     writer.StartBlock($"if {GetTypeAssertion(valueVarName, propertyTypeImportName, "cast", "ok")}; ok {{");
                     valueVarName = "cast";
                 }
                 writer.WriteLine($"{ResultVarName}.{property.Setter!.Name.ToFirstCharacterUpperCase()}({valueVarName})");
-                if (!propertyType.IsCollection && (propertyType.TypeDefinition is CodeClass || propertyType.TypeDefinition is CodeInterface))
+                if (!propertyType.IsCollection && (propertyType.TypeDefinition is CodeClass || propertyType.TypeDefinition is CodeInterface || propertyType.TypeDefinition is CodeEnum))
                     writer.CloseBlock();
                 writer.DecreaseIndent();
             }

tests/Kiota.Builder.Tests/KiotaBuilderTests.cs

@@ -8536,6 +8536,182 @@ public async Task InheritanceWithAllOfBaseClassNoAdditionalPropertiesAsync()
         Assert.Equal("baseDirectoryObject", link.StartBlock.Inherits.Name);
     }
 
+    [Fact]
+    public async Task ExclusiveUnionSingleEntriesMergingAsync()
+    {
+        var tempFilePath = Path.Combine(Path.GetTempPath(), Path.GetTempFileName());
+        await using var fs = await GetDocumentStreamAsync(
+"""
+openapi: 3.0.0
+info:
+  title: "Generator not generating oneOf if the containing schema has type: object"
+  version: "1.0.0"
+servers:
+  - url: https://mytodos.doesnotexist/
+paths:
+  /uses-components:
+    post:
+      description: Return something
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/UsesComponents"
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/UsesComponents"
+components:
+  schemas:
+    ExampleWithSingleOneOfWithTypeObject:
+      type: object
+      oneOf:
+        - $ref: "#/components/schemas/Component1"
+      discriminator:
+        propertyName: objectType
+    ExampleWithSingleOneOfWithoutTypeObject:
+      oneOf:
+        - $ref: "#/components/schemas/Component2"
+      discriminator:
+        propertyName: objectType
+
+    UsesComponents:
+      type: object
+      properties:
+        component_with_single_oneof_with_type_object:
+          $ref: "#/components/schemas/ExampleWithSingleOneOfWithTypeObject"
+        component_with_single_oneof_without_type_object:
+          $ref: "#/components/schemas/ExampleWithSingleOneOfWithoutTypeObject"
+
+    Component1:
+      type: object
+      required:
+        - objectType
+      properties:
+        objectType:
+          type: string
+        one:
+          type: string
+
+    Component2:
+      type: object
+      required:
+        - objectType
+      properties:
+        objectType:
+          type: string
+        two:
+          type: string
+""");
+        var mockLogger = new Mock<ILogger<KiotaBuilder>>();
+        var builder = new KiotaBuilder(mockLogger.Object, new GenerationConfiguration { ClientClassName = "Graph", OpenAPIFilePath = tempFilePath }, _httpClient);
+        var document = await builder.CreateOpenApiDocumentAsync(fs);
+        var node = builder.CreateUriSpace(document);
+        var codeModel = builder.CreateSourceModel(node);
+
+        // Verify that all three classes referenced by the discriminator inherit from baseDirectoryObject
+        var withObjectClass = codeModel.FindChildByName<CodeClass>("ExampleWithSingleOneOfWithTypeObject");
+        Assert.NotNull(withObjectClass);
+        var oneProperty = withObjectClass.FindChildByName<CodeProperty>("one", false);
+        Assert.NotNull(oneProperty);
+
+        var withoutObjectClass = codeModel.FindChildByName<CodeClass>("Component2");
+        Assert.NotNull(withObjectClass);
+        var twoProperty = withoutObjectClass.FindChildByName<CodeProperty>("two", false);
+        Assert.NotNull(twoProperty);
+    }
+
+    [Fact]
+    public async Task InclusiveUnionSingleEntriesMergingAsync()
+    {
+        var tempFilePath = Path.Combine(Path.GetTempPath(), Path.GetTempFileName());
+        await using var fs = await GetDocumentStreamAsync(
+"""
+openapi: 3.0.0
+info:
+  title: "Generator not generating anyOf if the containing schema has type: object"
+  version: "1.0.0"
+servers:
+  - url: https://mytodos.doesnotexist/
+paths:
+  /uses-components:
+    post:
+      description: Return something
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/UsesComponents"
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/UsesComponents"
+components:
+  schemas:
+    ExampleWithSingleOneOfWithTypeObject:
+      type: object
+      anyOf:
+        - $ref: "#/components/schemas/Component1"
+      discriminator:
+        propertyName: objectType
+    ExampleWithSingleOneOfWithoutTypeObject:
+      anyOf:
+        - $ref: "#/components/schemas/Component2"
+      discriminator:
+        propertyName: objectType
+
+    UsesComponents:
+      type: object
+      properties:
+        component_with_single_oneof_with_type_object:
+          $ref: "#/components/schemas/ExampleWithSingleOneOfWithTypeObject"
+        component_with_single_oneof_without_type_object:
+          $ref: "#/components/schemas/ExampleWithSingleOneOfWithoutTypeObject"
+
+    Component1:
+      type: object
+      required:
+        - objectType
+      properties:
+        objectType:
+          type: string
+        one:
+          type: string
+
+    Component2:
+      type: object
+      required:
+        - objectType
+      properties:
+        objectType:
+          type: string
+        two:
+          type: string
+""");
+        var mockLogger = new Mock<ILogger<KiotaBuilder>>();
+        var builder = new KiotaBuilder(mockLogger.Object, new GenerationConfiguration { ClientClassName = "Graph", OpenAPIFilePath = tempFilePath }, _httpClient);
+        var document = await builder.CreateOpenApiDocumentAsync(fs);
+        var node = builder.CreateUriSpace(document);
+        var codeModel = builder.CreateSourceModel(node);
+
+        // Verify that all three classes referenced by the discriminator inherit from baseDirectoryObject
+        var withObjectClass = codeModel.FindChildByName<CodeClass>("ExampleWithSingleOneOfWithTypeObject");
+        Assert.NotNull(withObjectClass);
+        var oneProperty = withObjectClass.FindChildByName<CodeProperty>("one", false);
+        Assert.NotNull(oneProperty);
+
+        var withoutObjectClass = codeModel.FindChildByName<CodeClass>("Component2");
+        Assert.NotNull(withObjectClass);
+        var twoProperty = withoutObjectClass.FindChildByName<CodeProperty>("two", false);
+        Assert.NotNull(twoProperty);
+    }
+
     [Fact]
     public async Task NestedIntersectionTypeAllOfAsync()
     {