CSV: Parsing and updating/appending.

CSV.rb

require 'csv'

#creates headers as symbols from top row data
def people
    return @people if @people # If we've already parsed the CSV file, don't parse it again. It's nil so it parses.
    @people = [] # Remember: @people is +nil+ by default. So turn it into an Array.
    CSV.foreach(@file, :headers => true, :header_converters => :symbol) do |row|
      @people << Person.new(row[:id], row[:first_name], row[:last_name], row[:email], row[:phone], row[:created_at])
    end # do
    @people
    # We've never called people before, now parse the CSV file
    # and return an Array of Person objects here.  Save the
    # Array in the @people instance variable.
  end #people

#appends to file:
def save_to_cvs_file
    CSV.open(@file, "a+") do |csv|
      csv << ["#{@people.last.id}", "#{@people.last.first_name}", "#{@people.last.last_name}", "#{@people.last.email}", "#{@people.last.phone}", "#{@people.last.created_at}"]
    end #do
  end #save to cvs file

#rewrites the whole csv file:
def save
    CSV.open(@file, 'w') do |file|
      file << ["id", "first_name", "last_name", "email", "phone", "created_at"]
        @people.each { |row| file << [row.id, row.first_name, row.last_name, row.email, row.phone, row.created_at] }
    end
    puts "#{@file} has been saved!"
  end
end