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-rw-r--r--lib/arel/engines/sql/relations/compiler.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/arel/engines/sql/relations/compiler.rb b/lib/arel/engines/sql/relations/compiler.rb
index 43d0e1aeb9..c8511374d9 100644
--- a/lib/arel/engines/sql/relations/compiler.rb
+++ b/lib/arel/engines/sql/relations/compiler.rb
@@ -14,7 +14,7 @@ module Arel
def select_sql
projections = @relation.projections
- if projections.first.is_a?(Count) && projections.size == 1 &&
+ if Count === projections.first && projections.size == 1 &&
(relation.taken.present? || relation.wheres.present?) && relation.joins(self).blank?
subquery = [
"SELECT 1 FROM #{relation.from_clauses}", build_clauses