Retrieve missing path parameters during slicing

Author: MaggieKimani1

src/Microsoft.OpenApi/Services/OpenApiFilterService.cs

@@ -164,6 +164,14 @@ public static OpenApiDocument CreateFilteredDocument(OpenApiDocument source, Fun
                 if (result.CurrentKeys.Operation != null)
                 {
                     pathItem.Operations.Add((OperationType)result.CurrentKeys.Operation, result.Operation);
+
+                    if (result.Parameters?.Any() ?? false)
+                    {
+                        foreach (var parameter in result.Parameters)
+                        {
+                            pathItem.Parameters.Add(parameter);
+                        }
+                    }
                 }
             }
 

src/Microsoft.OpenApi/Services/OperationSearch.cs

@@ -31,18 +31,25 @@ public OperationSearch(Func<string, OperationType?,OpenApiOperation, bool> predi
         }
 
         /// <summary>
-        /// Visits <see cref="OpenApiOperation"/>.
+        /// Visits <see cref="OpenApiPathItem"/>
         /// </summary>
-        /// <param name="operation">The target <see cref="OpenApiOperation"/>.</param>
-        public override void Visit(OpenApiOperation operation)
+        /// <param name="pathItem"> The target <see cref="OpenApiPathItem"/>.</param>
+        public override void Visit(OpenApiPathItem pathItem)
         {
-            if (_predicate(CurrentKeys.Path, CurrentKeys.Operation, operation))
+            foreach (var item in pathItem.Operations)
             {
-                _searchResults.Add(new SearchResult()
+                var operation = item.Value;
+                var operationType = item.Key;
+
+                if (_predicate(CurrentKeys.Path, CurrentKeys.Operation, operation))
                 {
-                    Operation = operation,
-                    CurrentKeys = CopyCurrentKeys(CurrentKeys)
-                });
+                    _searchResults.Add(new SearchResult()
+                    {
+                        Operation = operation,
+                        Parameters = pathItem.Parameters,
+                        CurrentKeys = CopyCurrentKeys(CurrentKeys, operationType)
+                    });
+                }
             }
         }
 
@@ -65,12 +72,12 @@ public override void Visit(IList<OpenApiParameter> parameters)
             base.Visit(parameters);
         }
 
-        private static CurrentKeys CopyCurrentKeys(CurrentKeys currentKeys)
+        private static CurrentKeys CopyCurrentKeys(CurrentKeys currentKeys, OperationType operationType)
         {
             return new CurrentKeys
             {
                 Path = currentKeys.Path,
-                Operation = currentKeys.Operation
+                Operation = operationType
             };
         }
     }

src/Microsoft.OpenApi/Services/SearchResult.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
+using System.Collections.Generic;
 using Microsoft.OpenApi.Models;
 
 namespace Microsoft.OpenApi.Services
@@ -19,5 +20,11 @@ public class SearchResult
         /// An Operation object.
         /// </summary>
         public OpenApiOperation Operation { get; set; }
+
+        /// <summary>
+        /// Parameters object
+        /// </summary>
+        public IList<OpenApiParameter> Parameters { get; set; }
+
     }
 }