[Bug] Groups in ComponentInstances made unique

[thomthom]

I know that if you edit a group copy via the API it affects all copies, but I've not found anyone describing this related problem:

Scenario:

You have a Component Instance ( Comp1)
Inside that component there's a group ( Group1 of GroupDef1)
You make a copy of the Component Instance ( Comp2)
Then you make Comp2 unique

Group1 inside Comp2 is still a copy of GroupDef1

You open Comp2 and edit the group inside, now it's made unique Group2 of GroupDef2
However, via the API, Group2.entities.parent still refer to GroupDef1
What's more, GroupDef1.instances does not refer to Group2

So while SU create a new definition when you edit Group2, the back-reference of Group2.entities.parent is not.

The only work around I've found is group.make_unique if not group.entities.parent.instances.include?(group). All though, this will break any group/copy links of group instances that actually is identical. So it's not ideal.

[thomthom]

I think this would be a non-destructive workaround:

def get_real_parent(group)
  Sketchup.active_model.definitions.each { |d|
    return d if d.group? && d.instances.include?(group)
  }
end

group_parent = ( group.entities.parent.instances.include?(group) ) ? group.entities.parent ; get_real_parent(group)

Next time the model is loaded the mixed up .parent references is corrected.

[remon_v]

thnx for the workaround,

haven't tried it yet tho.... but gj