CSV In and Out exercise

serialization.rb

require 'csv'
require 'date'

class Person

  attr_reader :first_name, :last_name, :email, :phone, :created_at

  def initialize(id, first_name, last_name, email, phone, created_at)
    @id = id
    @first_name = first_name
    @last_name = last_name
    @email = email
    @phone = phone
    @created_at = created_at
  end
end

class PersonParser
  attr_reader :file
  
  def initialize(file)
    @file = file
    @people = nil
  end
  
  def people
    require 'csv'
    @people = []
    CSV.foreach(@file) do |row|
      @people << row
    end
    return @people if @people != nil
  end

  def add_person(person)
    new_person = []
    new_person << (@people.last[0].to_i+1).to_s
    new_person << person.first_name
    new_person << person.last_name
    new_person << person.email
    new_person << person.phone
    new_person << person.created_at
    @people << new_person
    puts "#{person.first_name} #{person.last_name} has been added"
    return @people if @people != nil
  end

    # If we've already parsed the CSV file, don't parse it again.
    # Remember: @people is +nil+ by default.

    
    # 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.
  def save(file)
    require 'csv'
    CSV.open(file, "wb") do |csv|
      @people.each {|a|
        csv << a
      }
    end
  end
end

parser = PersonParser.new("people.csv")

puts "There are #{parser.people.size} people in the file '#{parser.file}'."

Zezan = Person.new(1,"Zezan","Tam","tam.zezan@gmail.com","+61432222428",1)
John = Person.new(2,"John","Smith","john.Smith@gmail.com","+61432222422",1)

parser.add_person(Zezan)
parser.add_person(John)

p parser
parser.save("dynamicwritetest.csv")