1. << is transactional, create is not
2. << method triggers the :before_add and :after_add callbacks, but the create method does not
3. << method returns operation_success ? association_proxy : false, while the create method returns the new instance created.
2. << method triggers the :before_add and :after_add callbacks, but the create method does not
3. << method returns operation_success ? association_proxy : false, while the create method returns the new instance created.
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