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-rw-r--r--activerecord/lib/active_record/attribute_methods/primary_key.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/primary_key.rb b/activerecord/lib/active_record/attribute_methods/primary_key.rb
index 8fcac82a0d..2f32caa257 100644
--- a/activerecord/lib/active_record/attribute_methods/primary_key.rb
+++ b/activerecord/lib/active_record/attribute_methods/primary_key.rb
@@ -9,7 +9,7 @@ module ActiveRecord
# available.
def to_key
sync_with_transaction_state
- key = self.id
+ key = id
[key] if key
end