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-rw-r--r--activerecord/lib/active_record/attribute_methods/primary_key.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/primary_key.rb b/activerecord/lib/active_record/attribute_methods/primary_key.rb
index 931209b07b..cb550b0683 100644
--- a/activerecord/lib/active_record/attribute_methods/primary_key.rb
+++ b/activerecord/lib/active_record/attribute_methods/primary_key.rb
@@ -15,6 +15,7 @@ module ActiveRecord
# Returns the primary key value.
def id
+ return unless self.class.primary_key
sync_with_transaction_state
read_attribute(self.class.primary_key)
end