Fixes #11773 when using includes combined with select, the select statement was overwritten.

3 files changed, 15 insertions, 1 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 83c94caa53..c3c4ae7862 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -199,6 +199,12 @@
 
     *Yves Senn*
 
+*   Fixes bug when using includes combined with select, the select statement was overwritten.
+
+    Fixes #11773
+
+    *Edo Balvers*
+
 *   Load fixtures from linked folders.
 
     *Kassio Borges*
diff --git a/activerecord/lib/active_record/relation/finder_methods.rb b/activerecord/lib/active_record/relation/finder_methods.rb
index 0132a02f83..fb8f44b188 100644
--- a/activerecord/lib/active_record/relation/finder_methods.rb
+++ b/activerecord/lib/active_record/relation/finder_methods.rb
@@ -261,7 +261,7 @@ module ActiveRecord
     end
 
     def construct_relation_for_association_find(join_dependency)
-      relation = except(:select).select(join_dependency.columns)
+      relation = except(:select).select(join_dependency.columns + select_values)
       apply_join_dependency(relation, join_dependency)
     end
 
diff --git a/activerecord/test/cases/relations_test.rb b/activerecord/test/cases/relations_test.rb
index f814947ab2..396d4ef1e9 100644
--- a/activerecord/test/cases/relations_test.rb
+++ b/activerecord/test/cases/relations_test.rb
@@ -486,6 +486,14 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal Developer.where(name: 'David').map(&:id).sort, developers
   end
 
+  def test_includes_with_select
+    query = Post.select('comments_count AS ranking').order('ranking').includes(:comments)
+      .where(comments: { id: 1 })
+
+    assert_equal ['comments_count AS ranking'], query.select_values
+    assert_equal 1, query.to_a.size
+  end
+
   def test_loading_with_one_association
     posts = Post.preload(:comments)
     post = posts.find { |p| p.id == 1 }