From ae51f83cca7a2fa474b931c2898a5cab96277873 Mon Sep 17 00:00:00 2001
From: Havunen <sampo.kivisto@live.fi>
Date: Sun, 25 Feb 2024 08:25:05 +0200
Subject: [PATCH] Fixes an issue where interface chain is not checked for
 parameters, this resolves issue:
 https://github.com/domaindrivendev/Swashbuckle.AspNetCore/issues/2596 for
 https://github.com/Havunen/DotSwashbuckle/issues/3

---
 .../ApiParameterDescriptionExtensions.cs      | 22 +++++++++++++++++-
 .../Controllers/CrudActionsController.cs      | 23 +++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/src/DotSwashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/ApiParameterDescriptionExtensions.cs b/src/DotSwashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/ApiParameterDescriptionExtensions.cs
index e0f8dd980a..7b6d48c939 100644
--- a/src/DotSwashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/ApiParameterDescriptionExtensions.cs
+++ b/src/DotSwashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/ApiParameterDescriptionExtensions.cs
@@ -44,7 +44,27 @@ public static PropertyInfo PropertyInfo(this ApiParameterDescription apiParamete
         {
             var modelMetadata = apiParameter.ModelMetadata;
 
-            return modelMetadata?.ContainerType?.GetProperty(modelMetadata.PropertyName);
+            if (modelMetadata.ContainerType != null)
+            {
+                PropertyInfo propertyInfo = modelMetadata.ContainerType.GetProperty(modelMetadata.PropertyName);
+
+                if (propertyInfo != null)
+                {
+                    return propertyInfo;
+                }
+
+                foreach (var type in modelMetadata.ContainerType.GetInterfaces())
+                {
+                    propertyInfo = type.GetProperty(modelMetadata.PropertyName);
+
+                    if (propertyInfo != null)
+                    {
+                        return propertyInfo;
+                    }
+                }
+            }
+
+            return null;
         }
 
         public static IEnumerable<object> CustomAttributes(this ApiParameterDescription apiParameter)
diff --git a/test/WebSites/Basic/Controllers/CrudActionsController.cs b/test/WebSites/Basic/Controllers/CrudActionsController.cs
index b5e38e2460..56784c267f 100644
--- a/test/WebSites/Basic/Controllers/CrudActionsController.cs
+++ b/test/WebSites/Basic/Controllers/CrudActionsController.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
+using System.Net.Mime;
 using Microsoft.AspNetCore.Mvc;
 
 namespace Basic.Controllers
@@ -97,6 +98,28 @@ public ProductStatus PostStatus([FromBody] ProductStatus status)
         {
             return status;
         }
+
+        [HttpGet("GetDoc")]
+        [Consumes(typeof(IChild), MediaTypeNames.Application.Json)]
+        [Produces(typeof(IChild))]
+        public IActionResult GetDoc([FromQuery] IChild query)
+        {
+            return null;
+        }
+    }
+
+    /// <summary>The parent.</summary>
+    public interface IParent
+    {
+        /// <summary>The parent value.</summary>
+        string? ParentValue { get; set; }
+    }
+
+    /// <summary>The child.</summary>
+    public interface IChild : IParent
+    {
+        /// <summary>The child value.</summary>
+        string? Value { get; set; }
     }
 
     public enum ProductStatus