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-rw-r--r--activerecord/lib/active_record/autosave_association.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/autosave_association.rb b/activerecord/lib/active_record/autosave_association.rb
index a540570f42..c1bc8423a9 100644
--- a/activerecord/lib/active_record/autosave_association.rb
+++ b/activerecord/lib/active_record/autosave_association.rb
@@ -339,7 +339,8 @@ module ActiveRecord
association.save(!autosave) if association.new_record? || autosave
if association.updated?
- self[reflection.primary_key_name] = association.id
+ association_id = association.send(reflection.options[:primary_key] || :id)
+ self[reflection.primary_key_name] = association_id
# TODO: Removing this code doesn't seem to matter…
if reflection.options[:polymorphic]
self[reflection.options[:foreign_type]] = association.class.base_class.name.to_s