Question

Please consider two objects of class Product:

class Product < ActiveRecord::Base {
  :id => :integer,
  :name => :string,
  :total_stock => :integer,
  :cents_retail_sale_amount => :integer,
  :cents_cost_amount => :integer,
  :created_at => :datetime,
  :updated_at => :datetime
}

Let’s say I have 2 objects:

  a{
  :id => 12,
  :name => "Shirt",
  :total_stock => 1,
  :cents_retail_sale_amount => 2500,
  :cents_cost_amount => 2100,
  :created_at => Mon, 23 Jul 2012 16:16:33 CDT -05:00,
  :updated_at => Mon, 23 Jul 2012 17:24:15 CDT -05:00}

  b {
  :id => nil,
  :name => "Polo Shirt",
  :total_stock => 1,
  :cents_retail_sale_amount => 2500,
  :cents_cost_amount => 2100,
  :created_at => Mon, 23 Jul 2012 16:16:33 CDT -05:00,
  :updated_at => Mon, 23 Jul 2012 17:24:15 CDT -05:00}

Now here is what I’m trying to do:

a.update_attributes(b.to_product.attributes.except("id", "created_at", "updated_at")

The problem however ( which I caught only cause I have a validation on the cents fields – to allow amounts only between 0 and $100 ( 10000 cents)), is this – my cents fields get also updated and get extra 00 at the end – so I get $2500 & $2100 for the the retail and cost amounts. While really nice profit margin – not really realistic.

I can obviously do some kind of processing on the b object before updating attributes ( such as not updating money fields and do the separately one by one), but that’s not really efficient. So I’m wondering if I’m doing something wrong

Thanks

Answer 1

I switched to https://github.com/RubyMoney/money-rails gem instead which solved the issue