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Asked: 2026-06-15T03:33:47+00:00

I’m trying to create a new CSV object with only the header row in

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I’m trying to create a new CSV object with only the header row in it, but the headers are not set until I call read():

[32] pry(main)> c = CSV.new("Keyword,Index,Page,Index in Page,Type,Title,URL", :headers => :first_row, :write_headers => true, :return_headers => true)
=> <#CSV io_type:StringIO encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"" headers:true>
[33] pry(main)> c.headers
=> true
[34] pry(main)> c.read
=> #<CSV::Table mode:col_or_row row_count:1>
[35] pry(main)> c.headers
=> ["Keyword", "Index", "Page", "Index in Page", "Type", "Title", "URL"]

Why is that? Why can’t I get a properly working CSV object with my single CSV.new line?

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1 Answer

  1. Editorial Team

    As the documentation will tell you it’s treating the string as if it were the contents of a file (i.e. StringIO) so you still have to read the string just as you would any other IO source.

    If you want to set the headers explicitly, you pass an array as the :headers parameter.

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