Rails - Mar 2007 - Session trouble

I am having a problem with an assignment to an object stored in session.

for example when I am in console

o = NewOrder.new
  #   dl = DeliveryLocation.new
  #   o.delivery_location = dl  #=> returns a delivery location object
  #   o.delivery_loaction.save #=> returns true

when I am using the controller

delivery_location = DeliveryLocation.new(params[:delivery_location])
session[:order].delivery_location = delivery_location
session[:order].delivery_location.save

When it gets to session[:order].delivery_location = delivery_location I
get the error
You have a nil object when you didn''t expect it!
The error occurred while evaluating nil.klass

/association_proxy.rb:147:in `raise_on_type_mismatch''
/associations/has_one_association.rb:44:in `replace''
/associations.rb:900:in `delivery_location=''
/delivery_locations_controller.rb:21:in `create''

my Order model has_one :delivery_location
my DeliveryLocation model belongs_to :order

Any suggestions would be awesome.

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write a test suite

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It seems that if I change my association to

class Order
  has_many :delivery_locations
end

class DeliveryLocation
  belongs_to :order
end

then just append the delivery _location object into the 
delivery_locations array then it works..... BUT, this is not what I 
want.

Another example I seen was on the dev.rubyonrails.org

class Citizen < ActiveRecord::Base
  has_one :ss_number
end

class SSNumber < ActiveRecord::Base
  belongs_to :citizen
end

If I want this, but have to change it to Citizen has_many :ss_numbers 
just to work there is a problem.

Looking through the rails files, it seems what is dying is
def raise_on_type_mismatch(record)
  unless record.is_a?(@reflection.klass)

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Keynan Pratt wrote:
> write a test suite
Thanks. It didn''t show me anything different, but I did write a test
and
I get the same thing.

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Hi Jeremy, I came across your post and was having a similar problem. To 
solve it I found that I had to initialize my association (also a 
belongs_to) when first storing the object in the session (in your case 
session[:order]). In other words when first assigning session[:order] 
make sure that the delivery_location is not nil. You may not have that 
data collected yet (in my case I have multi-step wizard with a complex 
object graph), but just be sure that the belongs_to relationship is 
initialized. Otherwise Rails seems to throw that nil.klass error when 
calling raise_on_type_mismatch because nil isn''t the same type as 
DeliveryLocation. Go figure.

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Hi Jeremy, there''s no attribute or attr_writer on the session called

delivery_location
If you''re trying to simply save an object into a session, you can do
the following:

session[:order] = o

Now, you can pull it out by doing the following:

order = session[:order]

If you require further information, I would recommend referencing the
relevant section in AWDwRv2.

Good luck,

-Conrad

On 3/26/07, Jeremy Woertink
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
>
>
>
> I am having a problem with an assignment to an object stored in session.
>
> for example when I am in console
>
> o = NewOrder.new
>   #   dl = DeliveryLocation.new
>   #   o.delivery_location = dl  #=> returns a delivery location object
>   #   o.delivery_loaction.save #=> returns true
>
> when I am using the controller
>
> delivery_location = DeliveryLocation.new(params[:delivery_location])
> session[:order].delivery_location = delivery_location
> session[:order].delivery_location.save
>
> When it gets to session[:order].delivery_location = delivery_location I
> get the error
> You have a nil object when you didn''t expect it!
> The error occurred while evaluating nil.klass
>
> /association_proxy.rb:147:in `raise_on_type_mismatch''
> /associations/has_one_association.rb:44:in `replace''
> /associations.rb:900:in `delivery_location=''
> /delivery_locations_controller.rb:21:in `create''
>
> my Order model has_one :delivery_location
> my DeliveryLocation model belongs_to :order
>
> Any suggestions would be awesome.
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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