Question

I’m new to Ruby and as part of my studies I got a task to convert a CSV file into something I can sort by price and such. However I am having trouble creating a list of objects. I know that I could make object1, object2 and such, but I do not know how to do this automatically.

This is the code I have so far:

class Product
  attr_reader :id, :name, :price, :stock
  def initialize(id,name,price,stock)
    @id = id
    @name=name
    @price=price
    @stock=stock
  end
  def readout(variable)
    print product.id
    print "|"
    print product.name
    print "|"
    print product.price
    print "|"
    print product.stock
    puts ""
  end
end


products = []
newproducts= []
File.open("products.csv" , "r") do |f|
 f.each_line do |line|
   products << line
 end
end

puts products

products.each do |product|
  data = product.split(",")
  inbetween = Product.new(data[0].to_s, data[1].to_s, data[2].to_i, data[3].to_i)
  inbetween
  newproducts << inbetween
end

newproducts.sort_by{|x| x.price}

newproducts.each do |product|
print product.id
print "|"
print product.name
print "|"
print product.price
print "|"
print product.stock
puts ""
end

Answer 1

Probably the easiest thing to do is to create a list and then, when you create each new product, you just push it onto the list. Then you can use sort_by to sort the list however you want.

So in your code, you have the array newproduct, so just do this:

products.each do |product|
  data = product.split(",")
  newproduct.push(Products.new(data[0], data[1], data[2], data[3]))
end

If you want to sort by price:

newproduct.sort_by{|x| x.price}