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-rw-r--r--activerecord/lib/active_record/associations/association.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations/association.rb b/activerecord/lib/active_record/associations/association.rb
index 6acf831759..c166cfd68f 100644
--- a/activerecord/lib/active_record/associations/association.rb
+++ b/activerecord/lib/active_record/associations/association.rb
@@ -171,7 +171,7 @@ module ActiveRecord
skip_assign = [reflection.foreign_key, reflection.type].compact
assigned_keys = record.changed_attribute_names_to_save
assigned_keys += except_from_scope_attributes.keys.map(&:to_s)
- attributes = scope_for_create.except(*(assigned_keys - skip_assign))
+ attributes = scope_for_create.except!(*(assigned_keys - skip_assign))
record.send(:_assign_attributes, attributes) if attributes.any?
set_inverse_instance(record)
end