class ArcFurnace::FixedColumnCSVSink

Public Class Methods

new(filename: , fields: , encoding: 'UTF-8', force_quotes: false) click to toggle source

Expects filename to a filename to open the csv Expects fields to a hash of Column name => column count

# File lib/arc-furnace/fixed_column_csv_sink.rb, line 9
def initialize(filename: , fields: , encoding: 'UTF-8', force_quotes: false)
  @csv = CSV.open(filename, 'wb', encoding: encoding, headers: true, force_quotes: force_quotes)
  @fields = fields
  write_header
end

Public Instance Methods

finalize() click to toggle source
# File lib/arc-furnace/fixed_column_csv_sink.rb, line 21
def finalize
  csv.close
end
row(hash) click to toggle source
# File lib/arc-furnace/fixed_column_csv_sink.rb, line 25
def row(hash)
  row = []
  fields.each do |column_name, count|
    values = Array.wrap(hash[column_name])
    (values.slice(0, count) || []).each do |value|
      row << value
    end
    (count - values.length).times { row << nil }
  end
  csv << row
end
write_header() click to toggle source
# File lib/arc-furnace/fixed_column_csv_sink.rb, line 15
def write_header
  csv << fields.each_with_object([]) do |(key, count), result|
    count.times { result << key }
  end
end