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-rw-r--r--activerecord/lib/active_record/relation/predicate_builder.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/relation/predicate_builder.rb b/activerecord/lib/active_record/relation/predicate_builder.rb
index 8948f2bba5..c60cd27a83 100644
--- a/activerecord/lib/active_record/relation/predicate_builder.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder.rb
@@ -55,7 +55,7 @@ module ActiveRecord
#
# For polymorphic relationships, find the foreign key and type:
# PriceEstimate.where(estimate_of: treasure)
- if klass && value.class < Base && reflection = klass.reflect_on_association(column.to_sym)
+ if klass && value.is_a?(Base) && reflection = klass.reflect_on_association(column.to_sym)
if reflection.polymorphic?
queries << build(table[reflection.foreign_type], value.class.base_class)
end