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bin/gems/csv-3.3.2/doc/csv/options/parsing/headers.rdoc

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+====== Option +headers+
+
+Specifies a boolean, \Symbol, \Array, or \String to be used
+to define column headers.
+
+Default value:
+  CSV::DEFAULT_OPTIONS.fetch(:headers) # => false
+
+---
+
+Without +headers+:
+  str = <<-EOT
+  Name,Count
+  foo,0
+  bar,1
+  bax,2
+  EOT
+  csv = CSV.new(str)
+  csv # => #<CSV io_type:StringIO encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+  csv.headers # => nil
+  csv.shift # => ["Name", "Count"]
+
+---
+
+If set to +true+ or the \Symbol +:first_row+,
+the first row of the data is treated as a row of headers:
+  str = <<-EOT
+  Name,Count
+  foo,0
+  bar,1
+  bax,2
+  EOT
+  csv = CSV.new(str, headers: true)
+  csv # => #<CSV io_type:StringIO encoding:UTF-8 lineno:2 col_sep:"," row_sep:"\n" quote_char:"\"" headers:["Name", "Count"]>
+  csv.headers # => ["Name", "Count"]
+  csv.shift # => #<CSV::Row "Name":"bar" "Count":"1">
+
+---
+
+If set to an \Array, the \Array elements are treated as headers:
+  str = <<-EOT
+  foo,0
+  bar,1
+  bax,2
+  EOT
+  csv = CSV.new(str, headers: ['Name', 'Count'])
+  csv
+  csv.headers # => ["Name", "Count"]
+  csv.shift # => #<CSV::Row "Name":"bar" "Count":"1">
+
+---
+
+If set to a \String +str+, method <tt>CSV::parse_line(str, options)</tt> is called
+with the current +options+, and the returned \Array is treated as headers:
+  str = <<-EOT
+  foo,0
+  bar,1
+  bax,2
+  EOT
+  csv = CSV.new(str, headers: 'Name,Count')
+  csv
+  csv.headers # => ["Name", "Count"]
+  csv.shift # => #<CSV::Row "Name":"bar" "Count":"1">