Simple deep pagination example using SOLR and R - r

Question

I'm needing to perform deep pagination using R and the solr package. SOLR 7.2.1 server, R 3.4.3
I can't figure out how to get the nextCursorMark from the resultant dataframe. I usually do this in Python but this is stumping me.
res <- solr_all(base = myBase, rows = 100, verbose=TRUE,
sort = "unique_id asc",
fq="*:*",
cursorMark="*"
)
I cannot get the nextCursorMark from the result. Any help would be appreciated.
I have noticed that if I add the nextCursorMark to pageDoc it will return the value if parsetype is set to json, but not dataframe. So I guess another part is - where is that value if you return a dataframe?

Answer 1

So I finally got a way to make this work. This is not optimal, the final solution is in the github issue referenced in the comment. But this works:
dat <-"http://yadda.com"
cM = "*"
done = FALSE
rowCount = 0
a <- data.frame()
while (!done)
{
Data <- solr_search(base = dat, rows = 100, verbose=FALSE,
sort = "unique_id asc",
fq="*:*",
parsetype="json",
cursorMark=cM,
pageDoc = "nextCursorMark"
)
if (cM == Data$nextCursorMark) {
done = TRUE
} else {
cM = Data$nextCursorMark
}
a <- append(x = a, Data$response$docs)
rowCount = rowCount + length(Data$response$docs)
print(rowCount)
}