Rails - Jan 2009 - Multi table inheritance problem with has_one relationship

Here is my issue

class TransactionProduct < ActiveRecord::Base
  has_one :product, :class_name => ''Product''
end

class Product < ActiveRecord::Base
  set_inheritance_column :class_name
end

class ProductVT < Product
 def self.base_class
    ProductVt
  end
end

So when I do

Product.find(:first) I got an instance of ProductVT with only the
columns of Product, which is ok.  Then when I do reload like this :

Product.find(:first).reload

I do have a complete instance of ProductVT.

But

When I do nagivate on Product from TransactionProduct and I do reload on
the instance of ProductVT it does not reload the ProductVT, it does it
on Product

TransactionProduct.find(:first).product.relaod  (reload the product
instance instead of ProductVT)

Even if I see in the console that is a ProductVT it reloads Product.  I
checked in development.log and in performs the query on Product.


Any idea.


Note : A temp fix is the to do a
Product.find(TransactionProduct.find(:first).product).reload, which is
ugly
-- 
Posted via http://www.ruby-forum.com/.

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

Hi,

On Jan 27, 7:46 pm, Rémi Gagnon
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> TransactionProduct.find(:first).product.relaod  (reload the product
> instance instead of ProductVT)
>
> Even if I see in the console that is a ProductVT it reloads Product.  I
> checked in development.log and in performs the query on Product.
>
> Any idea.
I fear I got lost somewhere but did you know ''becomes'' ?
TransactionProduct.find(:first).product(true).becomes(ProductVT)

BTW, the product(true) that I used is is quite(?) the same like
product.reload

ciao, tom

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

Thanks Tom for the suggestion.  I did not know this.  But the bads new 
is that does the same issue.

It looks like the superclass name is cached in the association then even 
if I do a reload or (true) and becomes, it fetch the data from Product 
instead of ProductVT

Rémi


Thomas r. Koll wrote:
> Hi,
> 
> On Jan 27, 7:46�pm, R�mi Gagnon <rails-mailing-l...@andreas-s.net>
> wrote:
> 
>> TransactionProduct.find(:first).product.relaod �(reload the product
>> instance instead of ProductVT)
>>
>> Even if I see in the console that is a ProductVT it reloads Product. �I
>> checked in development.log and in performs the query on Product.
>>
>> Any idea.
> 
> I fear I got lost somewhere but did you know ''becomes'' ?
> TransactionProduct.find(:first).product(true).becomes(ProductVT)
> 
> BTW, the product(true) that I used is is quite(?) the same like
> product.reload
> 
> ciao, tom
-- 
Posted via http://www.ruby-forum.com/.

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---