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bin/gems/csv-3.3.2/doc/csv/options/generating/write_converters.rdoc

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+====== Option +write_converters+
+
+Specifies converters to be used in generating fields.
+See {Write Converters}[#class-CSV-label-Write+Converters]
+
+Default value:
+  CSV::DEFAULT_OPTIONS.fetch(:write_converters) # => nil
+
+With no write converter:
+  str = CSV.generate_line(["\na\n", "\tb\t", " c "])
+  str # => "\"\na\n\",\tb\t, c \n"
+
+With a write converter:
+  strip_converter = proc {|field| field.strip }
+  str = CSV.generate_line(["\na\n", "\tb\t", " c "], write_converters: strip_converter)
+  str # => "a,b,c\n"
+
+With two write converters (called in order):
+  upcase_converter = proc {|field| field.upcase }
+  downcase_converter = proc {|field| field.downcase }
+  write_converters = [upcase_converter, downcase_converter]
+  str = CSV.generate_line(['a', 'b', 'c'], write_converters: write_converters)
+  str # => "a,b,c\n"
+
+See also {Write Converters}[#class-CSV-label-Write+Converters]