Polymorphic and sti problems

I’m way back at Rails 2.3.5. I can move up to 2.3.11 if anyone thinks
that will help. My problem is this:

class Entity < ActiveRecord::Base
  belongs_to :item, :polymorphic => true
end

class Name < ActiveRecord::Base
  has_one :entity, :class_name => "Entity", :as => :item
end

class Team < Name
end

The has_one does not work. It searches for the base_class of item
“Name” instead of the class “Team”. I see where these is a “trick”
where you can change item_type= in the documentation but that causes me
other problems.

I tried moving the has_one to Team but that didn’t change anything.

Any suggestions?

On May 11, 10:33pm, Perry S. [email protected] wrote:

class Team < Name
end

The has_one does not work. It searches for the base_class of item
“Name” instead of the class “Team”. I see where these is a “trick”
where you can change item_type= in the documentation but that causes me
other problems.

What exactly is “not working” here? Polymorphic associations are
designed to store the class that’s needed to retrieve the associated
record - storing the STI subclass instead of the base would mean that
the STI type was stored in two locations (both in the ‘type’ field
on the record, and in ‘item_type’ on the associated Entity record)
which is generally regarded as bad.

Note that base-class finds still return objects of subclasses (this
isn’t C++ :slight_smile: ):

Name.find(some_team_id) # => a Team object

–Matt J.

On 12 May 2011 03:33, Perry S. [email protected] wrote:

The has_one does not work. It searches for the base_class of item
“Name” instead of the class “Team”.

What command are you executing when you get a problem with “it
searching” - what searches? What SQL gets produced in the log file?

I see where these is a “trick”
where you can change item_type= in the documentation but that causes me
other problems.

What problems?

I tried moving the has_one to Team but that didn’t change anything.

hrmmm… that was my first thought…
If you try to associate Name objects, does that work okay?

Any suggestions?

A query: Why are you specifying the class_name? … as far as I can
see, it shouldn’t be necessary here (but shouldn’t cause a problem
either…)

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs