Fix find_in_batches against string IDs when start option is not specified.

1 files changed, 9 insertions, 0 deletions

diff --git a/activerecord/test/cases/batches_test.rb b/activerecord/test/cases/batches_test.rb
index 12d5245fbd..70ceaec4f0 100644
--- a/activerecord/test/cases/batches_test.rb
+++ b/activerecord/test/cases/batches_test.rb
@@ -136,4 +136,13 @@ class EachTest < ActiveRecord::TestCase
 
     assert_equal nick_order_subscribers[1..-1].map(&:id), subscribers.map(&:id)
   end
+
+  def test_find_in_batches_should_use_any_column_as_primary_key_when_start_is_not_specified
+    Subscriber.count('nick') # preheat arel's table cache
+    assert_queries(Subscriber.count + 1) do
+      Subscriber.find_each(:batch_size => 1) do |subscriber|
+        assert_kind_of Subscriber, subscriber
+      end
+    end
+  end
 end