From b9d668f8cb466ab70e107e8ed6e1df2d28c25f31 Mon Sep 17 00:00:00 2001
From: Sean Griffin <sean@thoughtbot.com>
Date: Fri, 23 Jan 2015 12:04:13 -0700
Subject: Don't remove join dependencies in `Relation#exists?`

Fixes #18632
---
 activerecord/test/cases/relations_test.rb | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'activerecord/test/cases')

diff --git a/activerecord/test/cases/relations_test.rb b/activerecord/test/cases/relations_test.rb
index 9631ea79be..d272b9b929 100644
--- a/activerecord/test/cases/relations_test.rb
+++ b/activerecord/test/cases/relations_test.rb
@@ -857,6 +857,12 @@ class RelationTest < ActiveRecord::TestCase
     assert ! fake.exists?(authors(:david).id)
   end
 
+  def test_exists_uses_existing_scope
+    post = authors(:david).posts.first
+    authors = Author.includes(:posts).where(name: "David", posts: { id: post.id })
+    assert authors.exists?(authors(:david).id)
+  end
+
   def test_last
     authors = Author.all
     assert_equal authors(:bob), authors.last
-- 
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