Eliminate duplicated request bodies and responses for actions/functions

src/Microsoft.OpenApi.OData.Reader/Edm/EdmModelExtensions.cs

@@ -200,7 +200,28 @@ public static bool IsOperationOverload(this IEdmModel model, IEdmOperation opera
         }
 
         /// <summary>
-        /// Check whether the operaiton import is overload in the model.
+        /// Checks whether operation targets singleton and entityset of the same type.
+        /// </summary>
+        /// <param name="model">The Edm model.</param>
+        /// <param name="operation"></param>
+        /// <returns>The test operations.</returns>
+        public static bool OperationTargetsMultiplePaths(this IEdmModel model, IEdmOperation operation)
+        {
+            Utils.CheckArgumentNull(model, nameof(model));
+            Utils.CheckArgumentNull(operation, nameof(operation));
+
+            if (!operation.Parameters.Any())
+                return false;
+
+            IEdmTypeReference bindingParameterType = operation.Parameters.First().Type;
+
+            return model.EntityContainer.EntitySets().Select(x => x.EntityType())
+                .Concat(model.EntityContainer.Singletons().Select(x => x.EntityType()))
+                .Where(x => x.FullName == bindingParameterType.FullName).Count() > 1;
+        }
+
+        /// <summary>
+        /// Check whether the operation import is overload in the model.
         /// </summary>
         /// <param name="model">The Edm model.</param>
         /// <param name="operationImport">The test operations.</param>

src/Microsoft.OpenApi.OData.Reader/Generator/OpenApiRequestBodyGenerator.cs

@@ -95,17 +95,26 @@ public static IDictionary<string, OpenApiRequestBody> CreateRequestBodies(this O
         {
             Utils.CheckArgumentNull(context, nameof(context));
 
-            return new Dictionary<string, OpenApiRequestBody>
+            Dictionary<string, OpenApiRequestBody> requestBodies = new()
             {
                 {
                     Constants.ReferencePostRequestBodyName,
-                    CreateRefPostRequestBody() 
+                    CreateRefPostRequestBody()
                 },
                 {
                     Constants.ReferencePutRequestBodyName,
                     CreateRefPutRequestBody()
                 }
             };
+
+            // add request bodies for actions targeting multiple related paths
+            foreach (IEdmAction action in context.Model.SchemaElements.OfType<IEdmAction>()
+                .Where(action => context.Model.OperationTargetsMultiplePaths(action)))
+            {
+                requestBodies.Add($"{action.Name}RequestBody", context.CreateRequestBody(action));
+            }
+
+            return requestBodies;
         }
 
         /// <summary>

src/Microsoft.OpenApi.OData.Reader/Generator/OpenApiResponseGenerator.cs

@@ -107,6 +107,12 @@ public static IDictionary<string, OpenApiResponse> CreateResponses(this ODataCon
             if(context.HasAnyNonContainedCollections())                                        
                 responses[$"String{Constants.CollectionSchemaSuffix}"] = CreateCollectionResponse("String");
 
+            foreach (IEdmOperation operation in context.Model.SchemaElements.OfType<IEdmOperation>()
+                .Where(op => context.Model.OperationTargetsMultiplePaths(op)))
+            {
+                responses[$"{operation.Name}Response"] = context.CreateOperationResponse(operation);
+            }
+
             return responses;
         }
 
@@ -115,86 +121,115 @@ public static IDictionary<string, OpenApiResponse> CreateResponses(this ODataCon
         /// </summary>
         /// <param name="context">The OData context.</param>
         /// <param name="operationImport">The Edm operation import.</param>
-        /// <param name="path">The OData path.</param>
         /// <returns>The created <see cref="OpenApiResponses"/>.</returns>
-        public static OpenApiResponses CreateResponses(this ODataContext context, IEdmOperationImport operationImport, ODataPath path)
+        public static OpenApiResponses CreateResponses(this ODataContext context, IEdmOperationImport operationImport)
         {
             Utils.CheckArgumentNull(context, nameof(context));
             Utils.CheckArgumentNull(operationImport, nameof(operationImport));
-            Utils.CheckArgumentNull(path, nameof(path));
 
-            return context.CreateResponses(operationImport.Operation, path);
+            return context.CreateResponses(operationImport.Operation);
         }
 
         /// <summary>
         /// Create the <see cref="OpenApiResponses"/> for a <see cref="IEdmOperation"/>
         /// </summary>
         /// <param name="context">The OData context.</param>
         /// <param name="operation">The Edm operation.</param>
-        /// <param name="path">The OData path.</param>
         /// <returns>The created <see cref="OpenApiResponses"/>.</returns>
-        public static OpenApiResponses CreateResponses(this ODataContext context, IEdmOperation operation, ODataPath path)
+        public static OpenApiResponses CreateResponses(this ODataContext context, IEdmOperation operation)
         {
             Utils.CheckArgumentNull(context, nameof(context));
             Utils.CheckArgumentNull(operation, nameof(operation));
-            Utils.CheckArgumentNull(path, nameof(path));
 
             OpenApiResponses responses = new();
 
             if (operation.IsAction() && operation.ReturnType == null)
             {
                 responses.Add(Constants.StatusCode204, Constants.StatusCode204.GetResponse());
             }
+            else if (context.Model.OperationTargetsMultiplePaths(operation) )
+            {
+                responses.Add(
+                    context.Settings.UseSuccessStatusCodeRange ? Constants.StatusCodeClass2XX : Constants.StatusCode200,
+                    new OpenApiResponse
+                    {
+                        UnresolvedReference = true,
+                        Reference = new OpenApiReference()
+                        {
+                            Type = ReferenceType.Response,
+                            Id = $"{operation.Name}Response"
+                        }
+                    }
+                 );
+            }
             else
             {
-                OpenApiSchema schema;
-                if (operation.ReturnType.IsCollection())
+                OpenApiResponse response = context.CreateOperationResponse(operation);
+                responses.Add(context.Settings.UseSuccessStatusCodeRange ? Constants.StatusCodeClass2XX : Constants.StatusCode200, response);
+            }
+
+            if (context.Settings.ErrorResponsesAsDefault)
+            {
+                responses.Add(Constants.StatusCodeDefault, Constants.StatusCodeDefault.GetResponse());
+            }
+            else
+            {
+                responses.Add(Constants.StatusCodeClass4XX, Constants.StatusCodeClass4XX.GetResponse());
+                responses.Add(Constants.StatusCodeClass5XX, Constants.StatusCodeClass5XX.GetResponse());
+            }
+
+            return responses;
+        }
+
+        public static OpenApiResponse CreateOperationResponse(this ODataContext context, IEdmOperation operation)
+        {
+            OpenApiSchema schema;
+            if (operation.ReturnType.IsCollection())
+            {
+                schema = new OpenApiSchema
                 {
-                    // Get the entity type of the previous segment
-                    IEdmEntityType entityType = path.Segments.Reverse().Skip(1)?.Take(1)?.FirstOrDefault()?.EntityType;
-                    schema = new OpenApiSchema
-                    {
-                        Title = entityType == null ? null : $"Collection of {entityType.Name}",
-                        Type = "object",
-                        Properties = new Dictionary<string, OpenApiSchema>
+                    Title = operation.ReturnType.Definition.AsElementType() is not IEdmEntityType entityType 
+                        ? null : $"Collection of {entityType.Name}",
+                    Type = "object",
+                    Properties = new Dictionary<string, OpenApiSchema>
                         {
                             {
                                 "value", context.CreateEdmTypeSchema(operation.ReturnType)
                             }
                         }
-                    };
-                }
-                else if (operation.ReturnType.IsPrimitive())
+                };
+            }
+            else if (operation.ReturnType.IsPrimitive())
+            {
+                // A property or operation response that is of a primitive type is represented as an object with a single name/value pair,
+                // whose name is value and whose value is a primitive value.
+                schema = new OpenApiSchema
                 {
-                    // A property or operation response that is of a primitive type is represented as an object with a single name/value pair,
-                    // whose name is value and whose value is a primitive value.
-                    schema = new OpenApiSchema
-                    {
-                        Type = "object",
-                        Properties = new Dictionary<string, OpenApiSchema>
+                    Type = "object",
+                    Properties = new Dictionary<string, OpenApiSchema>
                         {
                             {
                                 "value", context.CreateEdmTypeSchema(operation.ReturnType)
                             }
                         }
-                    };
-                }
-                else
-                {
-                    schema = context.CreateEdmTypeSchema(operation.ReturnType);
-                }
+                };
+            }
+            else
+            {
+                schema = context.CreateEdmTypeSchema(operation.ReturnType);
+            }
 
-                string mediaType = Constants.ApplicationJsonMediaType;
-                if (operation.ReturnType.AsPrimitive()?.PrimitiveKind() == EdmPrimitiveTypeKind.Stream)
-                {
-                    // Responses of types Edm.Stream should be application/octet-stream
-                    mediaType = Constants.ApplicationOctetStreamMediaType;
-                }
+            string mediaType = Constants.ApplicationJsonMediaType;
+            if (operation.ReturnType.AsPrimitive()?.PrimitiveKind() == EdmPrimitiveTypeKind.Stream)
+            {
+                // Responses of types Edm.Stream should be application/octet-stream
+                mediaType = Constants.ApplicationOctetStreamMediaType;
+            }
 
-                OpenApiResponse response = new()
-                {
-                    Description = "Success",
-                    Content = new Dictionary<string, OpenApiMediaType>
+            OpenApiResponse response = new()
+            {
+                Description = "Success",
+                Content = new Dictionary<string, OpenApiMediaType>
                     {
                         {
                             mediaType,
@@ -204,21 +239,9 @@ public static OpenApiResponses CreateResponses(this ODataContext context, IEdmOp
                             }
                         }
                     }
-                };
-                responses.Add(context.Settings.UseSuccessStatusCodeRange ? Constants.StatusCodeClass2XX : Constants.StatusCode200, response);
-            }
-
-            if (context.Settings.ErrorResponsesAsDefault)
-            {
-                responses.Add(Constants.StatusCodeDefault, Constants.StatusCodeDefault.GetResponse());
-            }
-            else
-            {
-                responses.Add(Constants.StatusCodeClass4XX, Constants.StatusCodeClass4XX.GetResponse());
-                responses.Add(Constants.StatusCodeClass5XX, Constants.StatusCodeClass5XX.GetResponse());
-            }
+            };
 
-            return responses;
+            return response;
         }
 
         private static OpenApiResponse CreateCollectionResponse(IEdmStructuredType structuredType)

src/Microsoft.OpenApi.OData.Reader/Operation/EdmActionOperationHandler.cs

@@ -37,10 +37,24 @@ protected override void SetBasicInfo(OpenApiOperation operation)
         /// <inheritdoc/>
         protected override void SetRequestBody(OpenApiOperation operation)
         {
-            IEdmAction action = EdmOperation as IEdmAction;
-            if (action != null)
+            if (EdmOperation is IEdmAction action)
             {
-                operation.RequestBody = Context.CreateRequestBody(action);
+                if (Context.Model.OperationTargetsMultiplePaths(action))
+                {
+                    operation.RequestBody = new OpenApiRequestBody
+                    {
+                        UnresolvedReference = true,
+                        Reference = new OpenApiReference
+                        {
+                            Type = ReferenceType.RequestBody,
+                            Id = $"{action.Name}RequestBody"
+                        }
+                    };
+                }
+                else
+                {
+                    operation.RequestBody = Context.CreateRequestBody(action);
+                }
             }
 
             base.SetRequestBody(operation);

src/Microsoft.OpenApi.OData.Reader/Operation/EdmOperationImportOperationHandler.cs

@@ -77,7 +77,7 @@ protected override void SetResponses(OpenApiOperation operation)
             // describing the structure of the success response by referencing an appropriate schema
             // in the global schemas. In addition, it contains a default name/value pair for
             // the OData error response referencing the global responses.
-            operation.Responses = Context.CreateResponses(EdmOperationImport, Path);
+            operation.Responses = Context.CreateResponses(EdmOperationImport);
 
             base.SetResponses(operation);
         }

src/Microsoft.OpenApi.OData.Reader/Operation/EdmOperationOperationHandler.cs

@@ -167,7 +167,7 @@ protected override void SetParameters(OpenApiOperation operation)
         /// <inheritdoc/>
         protected override void SetResponses(OpenApiOperation operation)
         {
-            operation.Responses = Context.CreateResponses(EdmOperation, Path);
+            operation.Responses = Context.CreateResponses(EdmOperation);
             base.SetResponses(operation);
         }
 

src/Microsoft.OpenApi.OData.Reader/PublicAPI.Unshipped.txt

@@ -30,6 +30,7 @@ Microsoft.OpenApi.OData.Vocabulary.Core.LinkRelKey.List = 1 -> Microsoft.OpenApi
 Microsoft.OpenApi.OData.Vocabulary.Core.LinkRelKey.ReadByKey = 0 -> Microsoft.OpenApi.OData.Vocabulary.Core.LinkRelKey
 Microsoft.OpenApi.OData.Vocabulary.Core.LinkRelKey.Update = 3 -> Microsoft.OpenApi.OData.Vocabulary.Core.LinkRelKey
 static Microsoft.OpenApi.OData.Common.OpenApiOperationExtensions.AddErrorResponses(this Microsoft.OpenApi.Models.OpenApiOperation operation, Microsoft.OpenApi.OData.OpenApiConvertSettings settings, bool addNoContent = false, Microsoft.OpenApi.Models.OpenApiSchema schema = null) -> void
+static Microsoft.OpenApi.OData.Edm.EdmModelExtensions.OperationTargetsMultiplePaths(this Microsoft.OData.Edm.IEdmModel model, Microsoft.OData.Edm.IEdmOperation operation) -> bool
 static Microsoft.OpenApi.OData.Edm.EdmTypeExtensions.ShouldPathParameterBeQuoted(this Microsoft.OData.Edm.IEdmType edmType, Microsoft.OpenApi.OData.OpenApiConvertSettings settings) -> bool
 Microsoft.OpenApi.OData.Edm.IODataPathProvider
 Microsoft.OpenApi.OData.Edm.IODataPathProvider.CanFilter(Microsoft.OData.Edm.IEdmElement element) -> bool