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-rw-r--r--activerecord/lib/active_record/validations/uniqueness.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb
index 5dece1cb36..5fa6a0b892 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -26,11 +26,12 @@ module ActiveRecord
relation = relation.and(table[finder_class.primary_key.to_sym].not_eq(record.send(:id))) if record.persisted?
Array(options[:scope]).each do |scope_item|
- scope_value = record.read_attribute(scope_item)
reflection = record.class.reflect_on_association(scope_item)
if reflection
scope_value = record.send(reflection.foreign_key)
scope_item = reflection.foreign_key
+ else
+ scope_value = record.read_attribute(scope_item)
end
relation = relation.and(table[scope_item].eq(scope_value))
end