SwaggerSchemaFilterAttribute

Swashbuckle.Core/Swagger/Annotations/ApplySwaggerSchemaFilterAttributes.cs

@@ -1,20 +1,34 @@
-using System;
-using System.Linq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Web.Http.Description;
 
 namespace Swashbuckle.Swagger.Annotations
 {
     public class ApplySwaggerSchemaFilterAttributes : ISchemaFilter
     {
         public void Apply(Schema schema, SchemaRegistry schemaRegistry, Type type)
-        {
-            var attributes = type.GetCustomAttributes(false).OfType<SwaggerSchemaFilterAttribute>();
-
-            foreach (var attribute in attributes)
-            {
-                var filter = (ISchemaFilter)Activator.CreateInstance(attribute.FilterType);
-                filter.Apply(schema, schemaRegistry, type);
-            }
+        {
+			// create list of base types
+			Stack<Type> types = new Stack<Type>();
+			types.Push(type);
+
+			Type t;
+			while ((t = types.Peek().BaseType) != null)
+			{
+				types.Push(t);
+			}
+
+			// walk attributes in order base-type -> child-type
+			// GetCustomAttributes(inherit: true) walks types in opposite direction and simple reverse would not suffice if multiple attributes are applied
+			while (types.Count > 0)
+			{
+				foreach (SwaggerSchemaFilterAttribute attribute in types.Pop().GetCustomAttributes(typeof(SwaggerSchemaFilterAttribute), false))
+				{
+					var filter = (ISchemaFilter)Activator.CreateInstance(attribute.FilterType);
+					filter.Apply(schema, schemaRegistry, type);
+				}
+			}
         }
     }
 }

Swashbuckle.Core/Swagger/Annotations/SwaggerSchemaFilterAttribute.cs

@@ -2,7 +2,7 @@
 
 namespace Swashbuckle.Swagger.Annotations
 {
-    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
     public class SwaggerSchemaFilterAttribute : Attribute
     {
         public SwaggerSchemaFilterAttribute(Type filterType)