write_empty_value
Specifies the object that is to be substituted for each field that has an empty String.
Default value:
CSV::DEFAULT_OPTIONS.fetch(:write_empty_value) # => ""
Without the option:
str = CSV.generate_line(['a', '', 'c', '']) str # => "a,\"\",c,\"\"\n"
With the option:
str = CSV.generate_line(['a', '', 'c', ''], write_empty_value: "x") str # => "a,x,c,x\n"