Hi,
I'm confused as to why this code example (from a book) won't work. They want to store a price in cents, but be able to set it and query it in Euros. To this end they are overwriting the getter and setter methods.
In my model:
class Product < ActiveRecord::Base def price Product.read_attribute(:price)/100.0 end def price=(value) Product.write_attribute(:price, value*100) end end
In the console: r = Product.new => #<Product id: nil, name: nil, price: nil, enabled: true, created_at: nil, updated_at: nil>
r.price = 10 NoMethodError: undefined method `write_attribute' for #<Class:0x6182658>
There is no mention of a typo in the book's errata, write_attribute doesn't appear to have been removed from rails, so I'm guessing something changed with rails which makes this not work.
I did some googling and saw that shorthand for read/write_attribute() is self
I tried the following and it worked great:
class Product < ActiveRecord::Base def price self[:price]/100.0 end def price=(value) self[:price] = value*100 end end
r = Product.new => #<Product id: nil, name: nil, price: nil, enabled: true, created_at: nil, updated_at: nil>
r.price = 10 => 10
Could anyone tell me why the first example produces a NoMethodError and the second one works just fine?
Thanks very much.
