Rails - May 2010 - Sharing model validation code in lib/, how do I do this?

Hello everyone,

I''m having a bit of difficulty finding out the proper way to mix in
code
that I put into the lib/ directory for Rails 2.3.5.

I have several models that require phone validation. I had at least three
models that used the same code, so I wanted to keep things DRY and moved it
out to the lib/ directory. I used to have code like this in each model:

    validate :phone_is_valid

Then I''d have a phone_is_valid method in the model:

    protected
    def phone_is_valid
      # process a bunch of logic
      errors.add_to_base("invalid phone") if validation failed
    end

I moved this code out into lib/phones/ and in lib/phones I have
lib/phones/phone_validation.rb, and in there I copy pasted the
phone_is_valid method.

My question is, how do I mix this into all of my models now? And does my
validate :phone_is_valid method remain the same or does that change? I want
to make sure that the errors.add_to_base method continues to function as it
did before while keeping everything DRY. obviously the following won''t
work:

    validate :Phones::PhoneValidation::phone_is_valid(number)

I also created another file in lib/phones/ called
lib/phones/phone_normalize.rb. Again, many models need the value input by
the user to be normalized. Meaning turn (555) 222-1212 to 5552221212 or
something similar. Can I invoke that simply by invoking
Phones::Phone_Normalize::normalize_method(number)?

I suppose I''m confused on the following:

* How to use the lib directory for validation of multiple models that need
access to a particular validation method
* How to use the lib directory for commonly shared methods that return
values

Thanks for the help,

Matthew.

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On 9 May 2010 00:26, Matthew Hillsborough
<matthew.hillsborough-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>wrote:
> Hello everyone,
>
> I''m having a bit of difficulty finding out the proper way to mix
in code
> that I put into the lib/ directory for Rails 2.3.5.
>
> I have several models that require phone validation. I had at least three
> models that used the same code, so I wanted to keep things DRY and moved it
> out to the lib/ directory. I used to have code like this in each model:
>
>     validate :phone_is_valid
>
> Then I''d have a phone_is_valid method in the model:
>
>     protected
>     def phone_is_valid
>       # process a bunch of logic
>       errors.add_to_base("invalid phone") if validation failed
>     end
>
> I moved this code out into lib/phones/ and in lib/phones I have
> lib/phones/phone_validation.rb, and in there I copy pasted the
> phone_is_valid method.
>
> My question is, how do I mix this into all of my models now? And does my
> validate :phone_is_valid method remain the same or does that change? I want
> to make sure that the errors.add_to_base method continues to function as it
> did before while keeping everything DRY. obviously the following
won''t work:
>
>     validate :Phones::PhoneValidation::phone_is_valid(number)
>
> I also created another file in lib/phones/ called
> lib/phones/phone_normalize.rb. Again, many models need the value input by
> the user to be normalized. Meaning turn (555) 222-1212 to 5552221212 or
> something similar. Can I invoke that simply by invoking
> Phones::Phone_Normalize::normalize_method(number)?
>
> I suppose I''m confused on the following:
>
> * How to use the lib directory for validation of multiple models that need
> access to a particular validation method
> * How to use the lib directory for commonly shared methods that return
> values
>
> Thanks for the help,
>
> Matthew.
>
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Maybe the following will help you .....

6 Creating Custom Validation Methods ..
http://guides.rails.info/activerecord_validations_callbacks.html
and/or ...

http://marklunds.com/articles/one/312

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