ActiveModel::Validations in another module?

rubyonrails-talk
1

Hey,

I'm trying to specify validations with ActiveModel::Validations at the module level, i.e., I wish to mix-in validations to a module. I am not succeeding at this, however. How do I mix-in ActiveModel::Validations into another module and use its methods just as I would in a class?

Thanks,

L

2

Hey,

I'm trying to specify validations with ActiveModel::Validations at the module level, i.e., I wish to mix-in validations to a module. I am not succeeding at this, however. How do I mix-in ActiveModel::Validations into another module and use its methods just as I would in a class?

I'm not sure what you mean. Do you want want to put a shared set of validations in a module or create a module that when included adds a set of validations (among other things)

Fred

3

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}

G

4

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

5

Matt,

Thanks, that did the trick, and I think it unlikely that I would have found that without some help!

Now, on to what is likely the subject of yet another post: How do I obtain the effect of ActiveModel::Validations#validates_associated if applied to non-ActiveRecord classes where I seek to obtain nested validations when the given class is composed of multiple Ruby objects...

G