Option header_converters¶ ↑

Specifies converters to be used in parsing headers. See Header Converters

Default value:

CSV::DEFAULT_OPTIONS.fetch(:header_converters) # => nil

Identical in functionality to option converters except that:

• The converters apply only to the header row.

• The built-in header converters are :downcase and :symbol.

This section assumes prior execution of:

str = <<-EOT
Name,Value
foo,0
bar,1
baz,2
EOT
# With no header converter
table = CSV.parse(str, headers: true)
table.headers # => ["Name", "Value"]

The value may be a header converter name (see Stored Converters):

table = CSV.parse(str, headers: true, header_converters: :downcase)
table.headers # => ["name", "value"]

The value may be a converter list (see Converter Lists):

header_converters = [:downcase, :symbol]
table = CSV.parse(str, headers: true, header_converters: header_converters)
table.headers # => [:name, :value]

The value may be a Proc custom converter (see Custom Header Converters):

upcase_converter = proc {|field| field.upcase }
table = CSV.parse(str, headers: true, header_converters: upcase_converter)
table.headers # => ["NAME", "VALUE"]

See also Custom Header Converters

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