Path grouping strategy

src/Swashbuckle.AspNetCore.SwaggerGen/DependencyInjection/ConfigureSwaggerGeneratorOptions.cs

@@ -116,6 +116,7 @@ public void DeepCopy(SwaggerGeneratorOptions source, SwaggerGeneratorOptions tar
             target.RequestBodyFilters = new List<IRequestBodyFilter>(source.RequestBodyFilters);
             target.RequestBodyAsyncFilters = new List<IRequestBodyAsyncFilter>(source.RequestBodyAsyncFilters);
             target.SecuritySchemesSelector = source.SecuritySchemesSelector;
+            target.PathGroupSelector = source.PathGroupSelector;
         }
 
         private TFilter GetOrCreateFilter<TFilter>(FilterDescriptor filterDescriptor)

src/Swashbuckle.AspNetCore.SwaggerGen/PublicAPI/PublicAPI.Unshipped.txt

@@ -6,3 +6,5 @@ static Microsoft.Extensions.DependencyInjection.SwaggerGenOptionsExtensions.Docu
 static Microsoft.Extensions.DependencyInjection.SwaggerGenOptionsExtensions.OperationAsyncFilter<TFilter>(this Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenOptions swaggerGenOptions, params object[] arguments) -> void
 static Microsoft.Extensions.DependencyInjection.SwaggerGenOptionsExtensions.ParameterAsyncFilter<TFilter>(this Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenOptions swaggerGenOptions, params object[] arguments) -> void
 static Microsoft.Extensions.DependencyInjection.SwaggerGenOptionsExtensions.RequestBodyAsyncFilter<TFilter>(this Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenOptions swaggerGenOptions, params object[] arguments) -> void
+Swashbuckle.AspNetCore.SwaggerGen.SwaggerGeneratorOptions.PathGroupSelector.get -> System.Func<Microsoft.AspNetCore.Mvc.ApiExplorer.ApiDescription, string>
+Swashbuckle.AspNetCore.SwaggerGen.SwaggerGeneratorOptions.PathGroupSelector.set -> void

src/Swashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/ApiDescriptionExtensions.cs

@@ -1,6 +1,6 @@
 using System;
-using System.Linq;
 using System.Collections.Generic;
+using System.Linq;
 using System.Reflection;
 using Microsoft.AspNetCore.Mvc.ApiExplorer;
 using Microsoft.AspNetCore.Mvc.Controllers;
@@ -41,7 +41,7 @@ public static IEnumerable<object> CustomAttributes(this ApiDescription apiDescri
                     .Union(methodInfo.DeclaringType.GetCustomAttributes(true));
             }
 
-            return Enumerable.Empty<object>();
+            return [];
         }
 
         [Obsolete("Use TryGetMethodInfo() and CustomAttributes() instead")]
@@ -57,7 +57,7 @@ public static void GetAdditionalMetadata(this ApiDescription apiDescription,
                 return;
             }
 
-            customAttributes = Enumerable.Empty<object>();
+            customAttributes = [];
         }
 
         internal static string RelativePathSansParameterConstraints(this ApiDescription apiDescription)

src/Swashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/ApiParameterDescriptionExtensions.cs

@@ -72,9 +72,7 @@ public static PropertyInfo PropertyInfo(this ApiParameterDescription apiParamete
         {
             var modelMetadata = apiParameter.ModelMetadata;
 
-            return (modelMetadata?.ContainerType != null)
-                ? modelMetadata.ContainerType.GetProperty(modelMetadata.PropertyName)
-                : null;
+            return modelMetadata?.ContainerType?.GetProperty(modelMetadata.PropertyName);
         }
 
         public static IEnumerable<object> CustomAttributes(this ApiParameterDescription apiParameter)
@@ -103,12 +101,12 @@ internal static void GetAdditionalMetadata(
 
         internal static bool IsFromPath(this ApiParameterDescription apiParameter)
         {
-            return (apiParameter.Source == BindingSource.Path);
+            return apiParameter.Source == BindingSource.Path;
         }
 
         internal static bool IsFromBody(this ApiParameterDescription apiParameter)
         {
-            return (apiParameter.Source == BindingSource.Body);
+            return apiParameter.Source == BindingSource.Body;
         }
 
         internal static bool IsFromForm(this ApiParameterDescription apiParameter)

src/Swashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/SwaggerGenerator.cs

@@ -56,7 +56,7 @@ public async Task<OpenApiDocument> GetSwaggerAsync(
             swaggerDoc.Paths = await GeneratePathsAsync(filterContext.ApiDescriptions, filterContext.SchemaRepository);
             swaggerDoc.Components.SecuritySchemes = await GetSecuritySchemesAsync();
 
-            // NOTE: Filter processing moved here so they may effect generated security schemes
+            // NOTE: Filter processing moved here so they may affect generated security schemes
             foreach (var filter in _options.DocumentAsyncFilters)
             {
                 await filter.ApplyAsync(swaggerDoc, filterContext, CancellationToken.None);
@@ -81,7 +81,7 @@ public OpenApiDocument GetSwagger(string documentName, string host = null, strin
                 swaggerDoc.Paths = GeneratePaths(filterContext.ApiDescriptions, filterContext.SchemaRepository);
                 swaggerDoc.Components.SecuritySchemes = GetSecuritySchemesAsync().Result;
 
-                // NOTE: Filter processing moved here so they may effect generated security schemes
+                // NOTE: Filter processing moved here so they may affect generated security schemes
                 foreach (var filter in _options.DocumentFilters)
                 {
                     filter.Apply(swaggerDoc, filterContext);
@@ -199,7 +199,7 @@ private async Task<OpenApiPaths> GeneratePathsAsync(
         {
             var apiDescriptionsByPath = apiDescriptions
                 .OrderBy(_options.SortKeySelector)
-                .GroupBy(apiDesc => apiDesc.RelativePathSansParameterConstraints());
+                .GroupBy(_options.PathGroupSelector);
 
             var paths = new OpenApiPaths();
             foreach (var group in apiDescriptionsByPath)

src/Swashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/SwaggerGeneratorOptions.cs

@@ -20,6 +20,7 @@ public SwaggerGeneratorOptions()
             OperationIdSelector = DefaultOperationIdSelector;
             TagsSelector = DefaultTagsSelector;
             SortKeySelector = DefaultSortKeySelector;
+            PathGroupSelector = DefaultPathGroupSelector;
             SecuritySchemesSelector = null;
             SchemaComparer = StringComparer.Ordinal;
             Servers = new List<OpenApiServer>();
@@ -49,6 +50,8 @@ public SwaggerGeneratorOptions()
 
         public Func<ApiDescription, string> SortKeySelector { get; set; }
 
+        public Func<ApiDescription, string> PathGroupSelector { get; set; }
+
         public bool InferSecuritySchemes { get; set; }
 
         public Func<IEnumerable<AuthenticationScheme>, IDictionary<string, OpenApiSecurityScheme>> SecuritySchemesSelector { get; set; }
@@ -120,5 +123,10 @@ private string DefaultSortKeySelector(ApiDescription apiDescription)
         {
             return TagsSelector(apiDescription).First();
         }
+
+        private static string DefaultPathGroupSelector(ApiDescription apiDescription)
+        {
+            return apiDescription.RelativePathSansParameterConstraints();
+        }
     }
 }

test/Swashbuckle.AspNetCore.SwaggerGen.Test/ConfigureSwaggerGeneratorOptionsTests.cs

@@ -18,7 +18,7 @@ public static void DeepCopy_Copies_All_Properties()
 
         // If this assertion fails, it means that a new property has been added
         // to SwaggerGeneratorOptions and ConfigureSwaggerGeneratorOptions.DeepCopy() needs to be updated
-        Assert.Equal(22, publicProperties.Length);
+        Assert.Equal(23, publicProperties.Length);
     }
 
     [Fact]

test/Swashbuckle.AspNetCore.SwaggerGen.Test/Fixtures/FakeController.cs

@@ -50,6 +50,9 @@ public void ActionWithIntParameterWithDefaultValue(int param = 1)
         public void ActionWithIntParameterWithDefaultValueAttribute([DefaultValue(3)] int param)
         { }
 
+        public void ActionWithIntFromQueryParameter([FromQuery] int param)
+        { }
+
         public void ActionWithIntParameterWithRequiredAttribute([Required] int param)
         { }
 

test/Swashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs

@@ -1143,6 +1143,36 @@ public void GetSwagger_ThrowsSwaggerGeneratorException_IfActionsHaveConflictingH
                 exception.Message);
         }
 
+        [Fact]
+        public void GetSwagger_ThrowsSwaggerGeneratorException_IfActionsHaveConflictingHttpMethodAndPathWithDifferentParameters()
+        {
+            var subject = Subject(
+                apiDescriptions:
+                [
+                    ApiDescriptionFactory.Create<FakeController>(
+                        c => nameof(c.ActionWithNoParameters), groupName: "v1", httpMethod: "GET", relativePath: "resource"),
+
+                    ApiDescriptionFactory.Create<FakeController>(
+                        c => nameof(c.ActionWithIntFromQueryParameter), groupName: "v1", httpMethod: "GET", relativePath: "resource", new ApiParameterDescription[]
+                        {
+                            new()
+                            {
+                                Name = "id",
+                                Source = BindingSource.Query,
+                            }
+                        }),
+                ]
+            );
+
+            var exception = Assert.Throws<SwaggerGeneratorException>(() => subject.GetSwagger("v1"));
+            Assert.Equal(
+                "Conflicting method/path combination \"GET resource\" for actions - " +
+                "Swashbuckle.AspNetCore.SwaggerGen.Test.FakeController.ActionWithNoParameters (Swashbuckle.AspNetCore.SwaggerGen.Test)," +
+                "Swashbuckle.AspNetCore.SwaggerGen.Test.FakeController.ActionWithIntFromQueryParameter (Swashbuckle.AspNetCore.SwaggerGen.Test). " +
+                "Actions require a unique method/path combination for Swagger/OpenAPI 3.0. Use ConflictingActionsResolver as a workaround",
+                exception.Message);
+        }
+
         [Fact]
         public void GetSwagger_SupportsOption_IgnoreObsoleteActions()
         {