GetSubComponentIds does not return all nested elements

[dchemanov]

Hello, I have complex pipe fitting (please see file attached). When I call 

GetSubComponentIds

I receive only one element, but I can't figure out why.

Thanks in advance!

[jeremy_tammik · Accepted solution]

Happy Easter!

Your image looks like two separate fittings to me. I don't see any reason why one would expect them to be nested.

Furthermore, I believe there is a significant difference between subcomponents and nested components.

I don't see these two fittings being subcomponents of each other either, though.

If you look at them with RevitLookup, what do you see? I would assume that you see two separate family instances.

I.e., no nesting, no subcomponent.

[dchemanov]

It's a single family instance, and for this instance I get only one family instance id when I call GetSubComponentIds.

[jeremy_tammik]

Well, then I suggest that you open the family definition RFA document and explore its internal structure there. You can do so manually or programmatically using EditFamily:

https://www.revitapidocs.com/2023/56e636ee-5008-0ee5-9d6c-5f622dedfbcb.htm

You may also be able to navigate into it using RevitLookup via the Revit application list of documents.