Ruby on Rails

On Oct 30, 9:15 am, Grary Stimon <li...@ruby-forum.com> wrote:
> Frederick,
>
> I seek to create Ruby modules that use ActiveModel::Validations. The
> examples I have seen of ActiveModel::Validations all involve including
> that module in classes. This is not what I want. I want to involve the
> use of ActiveModel::Validations in a module, which I may then choose to
> implement as a ruby class (even if after a few more descents via other
> modules.)
>
> In short, how do I do get to do the following (or its equivalent) in a
> module?
>
> validates :some_attribute, :numericality_of=>{:greater_than => 0,
> :allow_blank=>true}

I think ActiveSupport::Concern is what you're looking for here - you
could create a module that defines validations like this:

module SomeModule
extend ActiveSupport::Concern
include ActiveModel::Validations

included do
validates :some_attribute, ...
end
end

--Matt Jones

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