Rails - Dec 2006 - Validation in a model that is not to be saved

Hi group,

I built an input form that''s spread over multiple pages.  I store the
already given data (that match my models and my tables) in a cart-like
object. That works so far. But since I dont save the data, when the
user inputs it, validations don''t work. They may work on my last
(submit) page, but that too late.

Any way to make validations work even if they don''t pass the model?

Thx in advance
Jason


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Hello Jason,

2006/12/20, Jason1706 <drehstoph@gmx.net>:
> Any way to make validations work even if they don't pass the model?
If you have real ActiveRecord objects, you can call #valid?

http://api.rubyonrails.com/classes/ActiveRecord/Validations.html#M000800

Hope that helps !
-- 
Franois Beausoleil
http://blog.teksol.info/
http://piston.rubyforge.org/

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I think you need to get the attributes of the object assigned like

@object = Model.new(session[:cart])
@object.additional_attribute = value
@object.additional_attribute = value

 if @object.valid?
.....
 end

 I *think* something like that will work.

Adam

On 12/20/06, Jason1706 <drehstoph-hi6Y0CQ0nG0@public.gmane.org>
wrote:
>
>
> Hi group,
>
> I built an input form that''s spread over multiple pages.  I store
the
> already given data (that match my models and my tables) in a cart-like
> object. That works so far. But since I dont save the data, when the
> user inputs it, validations don''t work. They may work on my last
> (submit) page, but that too late.
>
> Any way to make validations work even if they don''t pass the
model?
>
> Thx in advance
> Jason
>
>
> >
>
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Hi François,

thx for your hint. So far, I was able to add basic validation to my
model like that

  def validate
    errors.add_on_empty %w{ title description }
  end

And in my controller where I temporarily store that object in my
virtual cart I can probe on validity like that :

  def create
    @product = Product.new(params[:product])
    if @product.valid?
      if @cart = find_cart
        @cart.add_product(@product)
        redirect_to(:action => ''display_cart'')
      else
        render :action => ''new''
      end
    else
      redirect_to(:action => ''new'')
    end
  end

But that great validation features for forms are still closed for me at
that point. Anything I dont see? This way, I''d to to all that by hand
.... and I''m a lazy typist :) 

Cheers Jason


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this will be your cup of tea:

http://www.realityforge.org/articles/2005/12/02/validations-for-non-activerecord-model-objects

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I think the question Jason is asking is how does he validate the 
individual fields even though the model isn''t fully baked (because of 
the multi-page form). Is that correct?

Validating for presence would be difficult in this situation because you 
have maybe three items that need to be present on the first page, two on 
the second, and two on the last. But the model instance won''t validate 
unless they''re all there.

Here''s an idea. What if you store a ''step'' attribute
in the model, and
only validate if you have reached the proper step? So the controller 
sets the step attribute to ''2'' after step 2 and then you put
in the
model:

validates_presence_of :foo, :if => Proc.new { |model| !model.step >= 2 }

Validating format would be similar. You can say something like:

validates_length_of :foo, :within => 5..10,
                          :if => Proc.new { |model| !model.foo.blank? }

That way the validation won''t fire unless the field has data.

Does that help?

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Adam Block wrote:
> validates_presence_of :foo, :if => Proc.new { |model| !model.step >=
2 }
Whoops. No negation needed there. Should read:

validates_presence_of :foo, :if => Proc.new { |model| model.step >= 2 }

And where I said ''model'' I was being generic. To be consistent
with your
previous example, ''model'' should be
''product'' I guess:

class Product
    validates_presence_of :foo, :if => Proc.new { |p| p.step >= 2 }
    validates_length_of :foo, :within => 5..10,
                              :if => Proc.new { |p| !p.foo.blank? }
end

/afb

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