def update_variants(self):
old_flags = Flags(self.old_unit.extra_flags, self.old_unit.flags)
new_flags = Flags(self.extra_flags, self.flags)
old_variant = None
if old_flags.has_value("variant"):
old_variant = old_flags.get_value("variant")
new_variant = None
if new_flags.has_value("variant"):
new_variant = new_flags.get_value("variant")
# Check for relevant changes
if old_variant == new_variant:
return
# Delete stale variant
if old_variant:
for variant in self.defined_variants.all():
variant.defining_units.remove(self)
if variant.defining_units.count() == 0:
variant.delete()
else:
variant.unit_set.filter(id_hash=self.id_hash).update(
variant=None)
# Add new variant
if new_variant:
variant = Variant.objects.get_or_create(
key=new_variant, component=self.translation.component)[0]
variant.defining_units.add(self)
# Update variant links
self.translation.component.update_variants()
