collect() gives error on hidden variables even if editor of dataset

[joewilliams-yg]

Tried using ds %>% select(var, ...) %>% collect().
Documentation for collect() does not mention a work around

unlock(ds)
df <- ds %>%
select('identity', 'gender', 'age', 'age4', 'race4', 'educ4', 'presvote16x', 'e14_presvote12', 'pid3', 'ideo3', 'region', 'votereg2', 'app_dtrmp') %>%
collect() %>%
mutate(
race3 = recode_factor(race4, 'White' = 'White/Other', 'Other' = 'White/Other', 'Black'='Black', 'Hispanic'='Hispanic'),
educ3 = recode_factor(educ4, 'HS or less' = 'HS or less', 'Some college' = 'Some college', 'College grad' = 'College degree', 'Postgrad' = 'College degree'),
educ2 = recode_factor(educ3, 'HS or less' = 'No degree', 'Some college' = 'No degree', 'College degree' = 'College grad')
) %>%
rename(presvote12 = e14_presvote12) %>%
filter(complete.cases(.))

Ends up with this error:
Error: Unknown column identity

[nealrichardson]

Likely this lapply: https://github.com/Crunch-io/crplyr/blob/master/R/collect.R#L27

is going through this method: https://github.com/Crunch-io/rcrunch/blob/master/R/dataset.R#L342

which does not include hidden variables.

Can't we now replace the guts of this collect method with as.data.frame.CrunchDataset? That didn't exist when the method was written, IIRC.