On Sep 17, 2014, at 9:09 AM, Matteo Panara <matteo.pan...@gmail.com> wrote:
> Why not?
>
> module ActiveModel
> module Validations
> class NumericalityValidator < EachValidator
> CHECKS = { greater_than: :>, greater_than_or_equal_to: :>=,
> equal_to: :==, less_than: :<, less_than_or_equal_to: :<=,
> multiple_of: :multiple_of?, odd: :odd?, even: :even?,
> odd: :odd?, even: :even?, other_than: :!= }.freeze
>
multiple_of isn’t a supported option for NumericalityValidator because the
method only exists for integers. Here’s some previous discussion of this
situation:
https://github.com/rails/rails/pull/7216 (on why multiple_of isn’t defined for
all of Numeric)
https://github.com/rails/rails/pull/7213 (on adding this exact feature)
TL;DR the core of the problem is that % is a tricky operator for floating-point
numbers. 1.0 % 0.1, for instance, is usually NOT 0.0 like you’d expect…
—Matt Jones
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