How to default (or initial) an admin select in Django's ModelAdmin

gistfile1.py

def formfield_for_dbfield(self, db_field, **kwargs):
	if db_field.name == "user":
		return forms.ModelChoiceField(queryset=User.objects.all().order_by('username'), initial=kwargs['request'].user.id)
		
	return super(NamedAdmin, self).formfield_for_dbfield(db_field, **kwargs)