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.
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