From f527c6037264eaf73398ce22c0d17d2b0aef78f8 Mon Sep 17 00:00:00 2001
From: Paul DeVito <pdevito3@gmail.com>
Date: Wed, 30 Sep 2026 17:03:13 +0300
Subject: [PATCH] fix(config)!: keep a query name in a nested path in alias
 replacement

The public ReplaceAliasesWithPropertyPaths changed Author.name to Author.Title when name is the query name of a top-level property. The segment after the dot belongs to another type, so the replacement made a wrong path. A query name after a dot now stays as it is. The filter parser does not call this method, so filters do not change.

BREAKING CHANGE: QueryKitPropertyMappings.ReplaceAliasesWithPropertyPaths no longer replaces a query name that comes after a dot. Code that calls this method directly and needs the v1.14.2 result must replace the nested segment itself.
---
 QueryKit.UnitTests/PropertyResolverTests.cs | 4 ++--
 QueryKit/QueryKitPropertyMappings.cs        | 5 +++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/QueryKit.UnitTests/PropertyResolverTests.cs b/QueryKit.UnitTests/PropertyResolverTests.cs
index 294b368..2cc8006 100644
--- a/QueryKit.UnitTests/PropertyResolverTests.cs
+++ b/QueryKit.UnitTests/PropertyResolverTests.cs
@@ -555,7 +555,7 @@ public void property_prevented_for_filter_and_sort_is_removed_by_its_member_name
     }
 
     [Fact]
-    public void alias_replacement_replaces_a_query_name_in_a_nested_path()
+    public void alias_replacement_does_not_replace_a_query_name_in_a_nested_path()
     {
         var config = new QueryKitConfiguration(config =>
         {
@@ -564,7 +564,7 @@ public void alias_replacement_replaces_a_query_name_in_a_nested_path()
 
         var input = config.PropertyMappings.ReplaceAliasesWithPropertyPaths("""Author.Name == "x" && name == "y" """);
 
-        input.Should().Be("""Author.Title == "x" && Title == "y" """);
+        input.Should().Be("""Author.Name == "x" && Title == "y" """);
     }
 
     [Fact]
diff --git a/QueryKit/QueryKitPropertyMappings.cs b/QueryKit/QueryKitPropertyMappings.cs
index d771ca8..229bb4f 100644
--- a/QueryKit/QueryKitPropertyMappings.cs
+++ b/QueryKit/QueryKitPropertyMappings.cs
@@ -144,8 +144,9 @@ public string ReplaceAliasesWithPropertyPaths(string input)
                 {
                     // Use regular expression to isolate left side of the expression. Query names and
                     // operators are matched literally, so escape any regex metacharacters they contain
-                    // (e.g. the `^` in `^^` would otherwise be read as a start-of-line anchor).
-                    var regex = AliasRegexCache.Get($@"\b{Regex.Escape(queryKitPropertyInfo.QueryName!)}\b(?=\s*{Regex.Escape(op)})");
+                    // (e.g. the `^` in `^^` would otherwise be read as a start-of-line anchor). A query name
+                    // after a dot is a segment of a nested path, so it is not replaced.
+                    var regex = AliasRegexCache.Get($@"(?<!\.)\b{Regex.Escape(queryKitPropertyInfo.QueryName!)}\b(?=\s*{Regex.Escape(op)})");
 
                     if (queryKitPropertyInfo is { CanSort: false, CanFilter: false} && regex.IsMatch(input))
                     {