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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 e3f221c773..8bd898d126 100644
--- a/activerecord/lib/active_record/attribute_methods/primary_key.rb
+++ b/activerecord/lib/active_record/attribute_methods/primary_key.rb
@@ -7,7 +7,7 @@ module ActiveRecord
# the record is not persisted? or has just been destroyed.
def to_key
key = send(self.class.primary_key)
- [key] if key
+ persisted? && key ? [key] : nil
end
module ClassMethods