How to use csv files in ruby

I am able to write parts of the code but I am not able to join the code
and use loops. I am quite new to RUBY and trying to do this project.

We have a list of customers
We have a list of products.

The customer is asked if he is new or returning
A new customer puts in his information and the customer database is
populated with his information if new customer
if existing customer, then with his name his details are pulled from the
database

Then he has to enter the shopping cart with the product names  and
quantity,
Then from the product table, the price of the product table, the price
of the product and the total (quantity*price) is calculated
in the end
it should print out the list of the products quantity price
 total sum
tax
shipping
 and
total= total sum+tax+shipping

all this information should be in a new csv file with the customer
information and saved in the folder.

this is what I have so far and I am freaking out.Its all over the place

require 'csv'
# Getting Information from the new customer and updating the csv file
puts "Are you a new cuntomer? y/n"
ans = gets.chomp
while ans == 'y' do

module CustomerRelated
class Customer
  def initialize( customer_id, fname, lname, address1, address2, city,
state, zip, ph_no)
  @fname = fname
  @lname = lname
  @address1 = address1
  @address1 = address1
  @city = city
  @state = state
  @zip = zip
  @ph_no = ph_no
  end


  puts "Enter first name"
  fname = gets.chomp
  puts "Enter last name"
  lname = gets.chomp
  puts "Enter your street address"
  address1= gets.chomp
  puts "Enter your House no./Apt no."
  address2= gets.chomp
  puts "Enter the City"
  city = gets.chomp
  puts "Enter the State"
  state = gets.chomp
  puts "Enter your Zip code"
  zip = gets.chomp
  puts "Enter your Phone Number"
  ph_no = gets.chomp

  #getting the customer data in the file
    CSV.open("customer.csv", "a") do |csv|
    #csv << ["First_Name", "Last_Name", "Address_1", "City" , "Zip" ,
"Ph_No"]
    csv << [fname, lname, address1, address2, city, state, zip, ph_no]


  end

end

puts "What is your First Name?"



class Sale
  def initialize( product_name, product_id, price, quantity,
total_price, tax, payment_type, shipping)

  @product_name = product_name
  @product_id = product_id
  @price = price
  @quantity = quantity
  @total_price = total_price
  @tax = tax
  @payment_type = payment_type
  @shipping = shipping

  end


  puts "Enter name of the product"
  product_name = gets.chomp
  puts "Enter the quantity"
  quantity = gets.chomp.to_i

  CSV.foreach("products.csv", "r") do |row|
    if product_name == row[1]
     product_id = row[0]
      price = row[2].to_f # fetch, convert from string, and store in
`price variable`
      total_price = (price * quantity)

  #getting the customer data in the file
    CSV.open("Shopping_list.csv", "a") do |csv|
    #csv << ["First_Name", "Last_Name", "Address_1", "City" , "Zip" ,
"Ph_No"]
    csv << [product_id, product_name, price, quantity, total_price]


  end

  puts "Do you have more products to add ? (y/n)?"
  answer = gets.chomp
  if answer = y then

  else
  #calculating shipping and tax
  sub_total=0
  puts "Your Sub total is"
  CSV.foreach("Shopping_list.csv", "r") do |row|
  sub_total= {for |x| do  row[4]


  puts "Enter your zip code"
  zip = gets.chomp

  CSV.foreach("zipcode.csv") do |row|
  if zipcode == row[0]

  shipping = row[1]

Attachments:
http://www.ruby-forum.com/attachment/6742/products.csv
http://www.ruby-forum.com/attachment/6743/customer.csv


-- 
Posted via http://www.ruby-forum.com/.