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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 93dae3ff86..a5c2849844 100644
--- a/activerecord/lib/active_record/attribute_methods/primary_key.rb
+++ b/activerecord/lib/active_record/attribute_methods/primary_key.rb
@@ -5,7 +5,7 @@ module ActiveRecord
# Returns this record's primary key value wrapped in an Array if one is available
def to_key
- key = send(self.class.primary_key)
+ key = self.id
[key] if key
end