no applicable method for 'group_by_' applied to an object of class "ggvis"

[maspotts]

I have run into an unexpected problem when including a call to ggvis::group_by in a library I'm building. This is the offending code:

x %>% gather(key, value, -x) %>% bind_rows(s) %>% ggvis(~x, ~value) %>%
         layer_points(fill=~key) %>% group_by(key) %>% layer_paths(stroke=~key)

and it works great if I paste it directly into my R shell. But when I build it into a library, using:

 #' @importFrom ggvis ggvis layer_points layer_paths group_by

and then try to execute that code I get this error:

Error in UseMethod("group_by_") :
no applicable method for 'group_by_' applied to an object of class "ggvis"

I see that ggvis::group_by is just UseMethod("group_by") in the dplyr namespace. I've tried importing group_by (and even also group_by_) from dplyr, but nothing helped. I'm at a loss to understand what I'm doing wrong, or conceivably I've found a bug? I did find references to this error message being due to a long-fixed bug in ggvis (6c1ebbe), which appears to add group_by_ as an export in ggvis' namespace.

I've replicated this problem under the latest ggvis (0.4.3) and both dplyr 0.5.0 and 0.7.0.

Any help will be gratefully appreciated!

[hadley]

I suspect the problem is that ggvis isn't exporting the group_by_ method.

[maspotts]

Thanks! Is that something I can work around? I’m pretty much stuck otherwise! Commit (6c1ebbe) added export of group_by_.ggvis. Is that relevant? I’m surprised that I’d be the first person to try to put a group_by() call into a library though! Mike

…

On Jun 22, 2017, at 7:11 AM, Hadley Wickham ***@***.***> wrote: I suspect the problem is that ggvis isn't exporting the group_by_ method. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#474 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AD6BvtYYU3h1QPknfmYQfDFHzaKZNE-Fks5sGnYWgaJpZM4OBcNk>.

[maspotts]

I had a poke around in the ggvis source code, and I can't find a group_by_ function. It defines group_by_.ggvis and group_by_.reactive (both wrap around dplyr::group_by_ ) and exports them both, but no group_by_ . I managed to get rid of the error by replacing group_by(key) with group_by_.ggvis("key"). Still don't understand why that's only necessary when calling it from my own package though!