This code sets the default sites for a sites ManyToMany property to
Site.objects.all(), which makes sure you don't have to bother setting it for each item on a site.
This could easily be changed to
Site.objects.get_current() to use the current site as default.
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def get_default_sites(): return [site.id for site in Site.objects.all()] class MyModel(models.Model): sites = models.ManyToManyField(Site, default=get_default_sites)