Rails 3: How to validate that A < B where A and B are both model attributes ?
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Misha Moroshko
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Published on 2010-12-28T09:47:55Z
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I would like to validate that customer_price >= my_price. I tried the following:
class Product < ActiveRecord::Base
attr_accessor :my_price
validates_numericality_of :customer_price, :greater_than_or_equal_to => my_price
...
end
(customer_price is a column in the Products table in the database, while my_price isn't.)
Here is the result:
NameError in ProductsController#index
undefined local variable or method `my_price' for #<Class:0x313b648>
What is the right way to do this in Rails 3 ?
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