Rails - Oct 2006 - Polymorphic assc. uses base_class of object instead of class , Why?

Example:

class User < ActiveRecord::Base
end

class Member < User
  has_one :blog, :as => :blogable
end


class Blog < ActiveRecrod::Base
  belongs_to :blogable, :polymorphic => true
end



The member.blog.blogable_type is ''User''.
Does anybody know the reasoning for using the base_class instead of the
class name of the object


--~--~---------~--~----~------------~-------~--~----~
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
-~----------~----~----~----~------~----~------~--~---

johan wrote:
> Example:
>
> class User < ActiveRecord::Base
> end
>
> class Member < User
>   has_one :blog, :as => :blogable
> end
>
> class Blog < ActiveRecrod::Base
>   belongs_to :blogable, :polymorphic => true
> end
>
> The member.blog.blogable_type is ''User''.
> Does anybody know the reasoning for using the base_class instead of the
> class name of the object
The STI/Polymorphic thing is a bit of a mess at the moment, as I
understand it. This recent documentation patch:

http://dev.rubyonrails.org/changeset/5259

contains some info that might help you for now.

Chris


--~--~---------~--~----~------------~-------~--~----~
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
-~----------~----~----~----~------~----~------~--~---

Chris Mear wrote:
> The member.blog.blogable_type is ''User''.
> Does anybody know the reasoning for using the base_class instead of the
> class name of the object
The reason is that the RDBMS needs to do joins on the actual table,
which corresponds to the base class, not the non-existent STI child
class.

Evan

-- 
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
-~----------~----~----~----~------~----~------~--~---