Rails - Nov 2005 - Newbie Question: The model equivilent of "helpers"

If I have ruby code that I need to share among a number of model classes,
what''s the "right" place to put it form a Ruby standpoint?

The code provides support for various calculations.  It has no data elements
that are persisted in a database.  It seems like there should be something
like a helpers directory for models for this kind of supporting code.

thanks for your help.
-larry


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If you have methods that you want to make available in a number of
classes, you should put these methods in a module and have each class
''include'' this module, i.e.

in RAILS_ROOT/lib/my_module.rb (you''ll want to
''require'' this file in
environment.rb too, probably)

  module MyModule
     def calculate_meaning_of_life
        6 * 7
     end
  end

... then in your model objects:

RAILS_ROOT/app/models/model_alpha.rb

  class ModelAlpha <  ActiveRecord::Base
    include MyModule
    ...
  end

RAILS_ROOT/app/models/model_beta.rb

  class ModelBeta < ActiveRecord::Base
    include MyModule
    ...
  end

... and so on.

- james

On 11/25/05, Larry White <ljw1001-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> If I have ruby code that I need to share among a number of model classes,
> what''s the "right" place to put it form a Ruby
standpoint?
>
>  The code provides support for various calculations.  It has no data
> elements that are persisted in a database.  It seems like there should be
> something like a helpers directory for models for this kind of supporting
> code.
>
>  thanks for your help.
>  -larry
>
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
>
>