Rails - Apr 2006 - Mixins?

As is often the case when I tackle a new platform/language, I get the big
picture very quickly (because frameworks are frameworks are frameworks) but
its the nitty-gritty of the language that bogs me down...

So I have some similar methods on a few of my model classes that I wanted to
push into a helper. Now I reckoned that the Ruby way was to create a module
and mix it in with include. However, I can''t get it to work
<frustration>

In the first instance I put it straight into the models directory:

module FieldHelper
  def validate_field
    if template_field.mandatory? && (!field_value ||
field_value.length==0)
      errors.add(template_field.name, _(''cant.be.blank''))
    end
  end
end

Now in the model I have this :

require "field_helper"

class SchemeAccountField < ActiveRecord::Base
  include FieldHelper

  protected
  def validate
    validate_field
  end

end

So basically I want to mix in very similar validation rules.

However, what I get is:

undefined local variable or method `validate_field'' for ...

I''m obviously missing something obvious and/or being stupid but
that''s the
nature of the game with a new language I suppose.

Any help out there?
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OK sorted it. I forgot to put the module in a file in the lib directory...
missed that bit. I can now include it in my model classes.

On 11/04/06, Sean Blezard <sean.blezard@gmail.com>
wrote:
>
> As is often the case when I tackle a new platform/language, I get the big
> picture very quickly (because frameworks are frameworks are frameworks) but
> its the nitty-gritty of the language that bogs me down...
>
> So I have some similar methods on a few of my model classes that I wanted
> to push into a helper. Now I reckoned that the Ruby way was to create a
> module and mix it in with include. However, I can''t get it to work
> <frustration>
>
> In the first instance I put it straight into the models directory:
>
> module FieldHelper
>   def validate_field
>     if template_field.mandatory? && (!field_value ||
> field_value.length==0)
>       errors.add(template_field.name, _(''cant.be.blank''))
>     end
>   end
> end
>
> Now in the model I have this :
>
> require "field_helper"
>
> class SchemeAccountField < ActiveRecord::Base
>   include FieldHelper
>
>   protected
>   def validate
>     validate_field
>   end
>
> end
>
> So basically I want to mix in very similar validation rules.
>
> However, what I get is:
>
> undefined local variable or method `validate_field'' for ...
>
> I''m obviously missing something obvious and/or being stupid but
that''s the
> nature of the game with a new language I suppose.
>
> Any help out there?
>
>
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