I was looking to add price information to the products in my
application. I may have to support other currencies besides USD in
the future, so I was looking at the Money gem from http://money.rubyforge.org/.
I'm pretty sure I've correctly added the code to my application;
here's what I've done:
I added a cents and currency field to my Product class, and a
composed_of helper for price:
class Product < ActiveRecord::Base
...
fields do
...
cents :integer, :default => 0
currency :string, :default => "USD"
end
composed_of :price, :class_name => "Money", :mapping => [ %w(cents,
cents), %w(currency, currency) ]
My Product class has some relations:
has_many :product_orders
has_many :orders, :through => :product_orders, :accessible => false
Now, I am thinking that the price of a Product can change depending on
several factors, and so the prices attached to the Product model are
just the default price you get when creating an Order. So the
ProductOrder join table also needs to have price information as well.
class ProductOrder < ActiveRecord::Base
...
fields do
quantity :integer, :default => 1
cents :integer, :default => 0
currency :string, :default => "USD"
end
belongs_to :product
belongs_to :order
composed_of :price, :class_name => "Money", :mapping => [ %w(cents,
cents), %w(currency, currency) ]
end
I've also added these methods to both the Product and ProductOrders
models:
def formatted_price
self.price.format(:html)
end
def formatted_price=(price)
self.price = Money.new(price)
end
I run the migration and it adds the cents and currency fields to the
DB. When I fire up the application server, I get an error on the New
Order page:
NoMethodError in OrdersController#new
undefined method `round' for nil:NilClass
The full trace is here: http://pastebin.ca/1774588
The trace shows the error is occurring when it gets to the field-list
for Order, which includes products, and product_orders.
So my questions are: What is calling the round method, and what's it
being called on? How do I get my app to use the formatted_price
methods instead of the price, cents, or currency fields? Should I
pull out all this stuff and just use doubles and worry about other
currencies if/when that problem comes up? :) Thanks!
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