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read_csv reads strings with "-" as date #228

felixhaass opened this Issue Aug 4, 2015 · 3 comments


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felixhaass commented Aug 4, 2015

read_csv() reads a string that contains a - always as a date, e.g. 3-19, but throws an error because the date is not complete. In the dataset I'm using, this denotes an ID string, however, and should be preserved as a string.

Here's a minimal working example:

writeLines(c("id, value","3-19, 5.0"), fileConn)

df <- read_csv("test.csv")

This produces:

> df <- read_csv("test.csv")
Warning message:
1 problems parsing 'test.csv'. See problems(...) for more details. 
> problems(df)
Source: local data frame [1 x 4]

  row col           expected actual
1   1   1 date like %Y-%m-%d   3-19

Now, this ends up as NA:

> df
Source: local data frame [1 x 2]

    id value
1 <NA>     5


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hadley commented Aug 21, 2015

More minimal reprex:


Likely because CollectorDate::canParse() is accepting partial matches


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Huade commented Aug 26, 2015

Works if specify col_types as character:

readr::read_csv("period\n2008-2012\n2009-2013", col_types = "c")

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hadley commented Sep 3, 2015

Even more minimal reprex

collectorGuess(c("1989-90", "1990-91"))

@hadley hadley closed this in 391de79 Sep 3, 2015

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