Log instrumentation name for exists? queries

2 files changed, 10 insertions, 2 deletions

diff --git a/activerecord/lib/active_record/relation/finder_methods.rb b/activerecord/lib/active_record/relation/finder_methods.rb
index c6e8762b4a..89f75fe3b2 100644
--- a/activerecord/lib/active_record/relation/finder_methods.rb
+++ b/activerecord/lib/active_record/relation/finder_methods.rb
@@ -193,8 +193,8 @@ module ActiveRecord
       else
         relation = relation.where(table[primary_key].eq(id)) if id
       end
-
-      connection.select_value(relation.to_sql) ? true : false
+      
+      connection.select_value(relation.to_sql, "#{name} Exists") ? true : false
     end
 
     protected
diff --git a/activerecord/test/cases/log_subscriber_test.rb b/activerecord/test/cases/log_subscriber_test.rb
index c6c6079490..9e8475465e 100644
--- a/activerecord/test/cases/log_subscriber_test.rb
+++ b/activerecord/test/cases/log_subscriber_test.rb
@@ -63,6 +63,14 @@ class LogSubscriberTest < ActiveRecord::TestCase
     assert_match(/SELECT .*?FROM .?developers.?/i, @logger.logged(:debug).last)
   end
 
+  def test_exists_query_logging
+    Developer.exists? 1
+    wait
+    assert_equal 1, @logger.logged(:debug).size
+    assert_match(/Developer Exists/, @logger.logged(:debug).last)
+    assert_match(/SELECT .*?FROM .?developers.?/i, @logger.logged(:debug).last)
+  end
+
   def test_cached_queries
     ActiveRecord::Base.cache do
       Developer.all