prefer bulk_create to repeated create. prefer once get_default to repeated get_default
prefer bulk_create to repeated create. prefer once get_default to repeated get_default

gradel/django-sortedm2m,gregmuellegger/django-sortedm2m,fabrique/django-sortedm2m,gradel/django-sortedm2m,fabrique/django-sortedm2m,gregmuellegger/django-sortedm2m,gregmuellegger/django-sortedm2m,fabrique/django-sortedm2m,gradel/django-sortedm2m