append to a csv file in ruby

To append to a CSV file in Ruby, you can use the CSV library to open the file in "append" mode and then write to it using the << operator. Here's an example:

main.rb
require 'csv'

# Open the CSV file in append mode
CSV.open('file.csv', 'a') do |csv|

  # Array of values to append to the CSV file
  values = ['John Smith', 'john@example.com', '123 Main St.']

  # Append the values to the CSV file
  csv << values
end
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In this example, we're opening the file file.csv in "append" mode using CSV.open. Then, we define an array of values to append to the file. Finally, we use the << operator to append the values to the file. The CSV.open block takes care of closing the file for us.