Rails - Jan 2012 - Polymorphic and standard association issue

Hello all,

I''m having a strange issue with a model that belongs_to two other
models.  The one association is polymorphic and the other is normal.

===============================class Role < ActiveRecord::Base
  belongs_to :user
  belongs_to :permission, :polymorphic => true
end

class User < ActiveRecord::Base
  has_many :roles
  has_many :programs, :through => :roles
end

class Program < ActiveRecord::Base
  has_many :roles, :as => :permissions
  has_many :users, :through => :roles
end
===============================
But for some reason...

===============================@user = User.find(1)
@user.roles << Role.create({:role => 100, :user_id => @user.id})
Rails.logger.info @user.roles.inspect
===============================
...returns nothing.  I''m very confused here.

My roles table has
---------------------------------------------------
| id  | user_id | permission_id | permission_type |
---------------------------------------------------
| 1   | 1       | NULL          | NULL            |
---------------------------------------------------

If anyone can help me out I''d greatly appreciate it.

Environment:
--------------
Ruby: REE
Rails: 3.1.2
Passenger

Thank you,
Sparkmasterflex

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I''m sorry to anyone who has spent any time on this at all.  I hope
since
I found the problem so quickly after posting this no one has.

The issue was that I was attempting to find all roles for the currently 
logged in user.  While they are creating a new User.

Basically @user was set in the controller as User.new and I needed to 
call current_user.roles instead.


Thank you listening to me and sorry again

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On Wed, Jan 18, 2012 at 6:53 PM, Keith Raymond
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> I''m sorry to anyone who has spent any time on this at all.  I hope
since
> I found the problem so quickly after posting this no one has.
>
No prob. I was looking into it and was going to suggest this version:

@user = User.find(1)
new_role = @user.roles.create({:role => 100})

Just a little bit neater (no need for the Role.create and for
the "dirty" pointer to the user_id) ...

or even better (IMHO)

class User < ActiveRecord::Base
 has_many :roles, :inverse_of :user
...

@user = User.find(1)
new_role = @user.roles.build({:role => 100 <http://user.id/>})
new_role. ... = ...

do all you have to do in memory and finish it off with

if user.save
  # OK
else
  # handle the problem
end

Which will give you a nice transaction over all. So, if
it only partially succeeds, you have an all or nothing to
you database.

   (0.2ms)  BEGIN
  SQL (0.5ms)  INSERT INTO ...
  SQL (0.4ms)  INSERT INTO ...
   (13.1ms)  COMMIT

With the inverse_of, also the belongs_to is automatically filled in.

HTH,

Peter

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