2 files changed, 10 insertions, 0 deletions
diff --git a/activerecord/test/cases/relations_test.rb b/activerecord/test/cases/relations_test.rb
index fddb7c204a..049c5a0606 100644
--- a/activerecord/test/cases/relations_test.rb
+++ b/activerecord/test/cases/relations_test.rb
@@ -573,6 +573,12 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal expected, actual
   end
 
+  def test_to_sql_on_scoped_proxy
+    auth = Author.first
+    Post.where("1=1").written_by(auth)
+    assert_not auth.posts.to_sql.include?("1=1")
+  end
+
   def test_loading_with_one_association_with_non_preload
     posts = Post.eager_load(:last_comment).order('comments.id DESC')
     post = posts.find { |p| p.id == 1 }
diff --git a/activerecord/test/models/post.rb b/activerecord/test/models/post.rb
index faf539a562..099e039255 100644
--- a/activerecord/test/models/post.rb
+++ b/activerecord/test/models/post.rb
@@ -149,6 +149,10 @@ class Post < ActiveRecord::Base
     ranked_by_comments.limit_by(limit)
   end
 
+  def self.written_by(author)
+    where(id: author.posts.pluck(:id))
+  end
+
   def self.reset_log
     @log = []
   end