tidy_dagitty(..., layout = "dendrogram") is broken

[coreyyanofsky]

The function tidy_dagitty contains these two lines:

layout_info <- dplyr::select(ggraph_layout, -x, -y) %>% 
  dplyr::mutate(name = as.character(name))
names(layout_info) <- c("name", ".ggraph.orig_index", "circular", 
  ".ggraph.index")

These lines assume that (excluding x, y) the name column will be first in the ggraph_layout tibble. For layout = dendrogram this assumption is violated: the first column is a logical vector named leaf, which gets renamed to name. (Later on there is a join on name that barfs due to type mismatch.)

[malcolmbarrett]

This is a #wontfix for me. Denodgrams are complex layout types, and it doesn't seem worth the effort to try to support them in ggdag since they're not as useful for this type of structure. I'd recommend working with ggraph directly if you have a pressing use case.

If this is an important feature to you, though, I'm open to a PR to better support them.

[malcolmbarrett]

Thanks for filing, though!