def group(graph_or_primitive, builder, opts \\ []) has no function definition for primitive

[tcoopman]

other functions with the same argument graph_or_primitive also have a definition with a Primitive struct, but it seems this is not implemented for group.

I'm not sure if group should not expect a primitive or if it's just not implemented?

Next to stating the issue, I'm also adding my problem here. I'm trying to use Graph.modify to update a complete group but I have no idea how to do it.

This is some simplified code:

Graph.build()
|> ....
|> group(
  fn g -> builds_many(g), id: :sample
)

def builds_many(g) do
  g
  |> rrect(...)
end

And on an update I want to basically replace the group sample by doing builds_many again.

These are the things I tried:

• Using Graph.modify, but this has the problem that I get a primitive (a group) and rrect can only take a Primitive of round_rect not group.
• First deleting the old Primitive with Graph.delete, then building a new graph (It's not possible to just create a group from nothing), creating a new group and then try to add this graph to the main graph, but Graph.add expects a primitive so this doesn't work
• using Graph.map, but this action also passes a Primitive

I'm probably missing something here, but I'm still struggling with it, and that's the reason I stumbled on this issue.

[boydm]

Good issue. Requires a think.

Do you expect that you would need to re-declare everything in the group or simply add/delete things from it. The items in a group are ordered, so that matters.

[tcoopman]

For my use case, I would actually love to simply replace the complete group (or everything that's inside the group) but I'm not sure if this is the best for performance.

[cboebel]

I have gotten around this - for now - by replaing the whole group. Not ideal but it works and its pretty quick.