ggplot_add.by()

[lawremi]

ggplot_add() lacks a method for "by" objects. Unfortunately, "by" objects do not have "list" in their class attribute, so ggplot_add.default() is hit instead of ggplot_add.list(). Given the prevalent use of by(), is it worth adding a method?

[hadley]

Sure, but what you imagine the method doing?

[lawremi]

Just calling the list method.

[hadley]

This just needs something like

ggplot_add.by <- function(object, plot, object_name) {
  ggplot_add.list(object, plot, object_name)
}

I don't think it needs a formal unit test — we should be able to tell by inspection (plus a single local test) whether or not it's correct.

[lock]

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