Rails - Apr 2008 - has_many :through & << & STI

I''ve got a pretty crazy has_many :through going.

My join table is set up like this:
# Table name: memberships
#
#  id             :integer         not null, primary key
#  member_of_id   :integer
#  member_of_type :string(255)
#  user_id        :integer

And in my User model, I''ve got:
class User < ActiveRecord::Base
  has_many :memberships
  has_many :terms, :through => :memberships, :source
=> :term, :conditions => "memberships.member_of_type =
''Term''"

def add_term(term)
    unless terms.exists? ["memberships.member_of_type = ? AND
memberships.member_of_id = ?", "Term", term]
      terms << term #Line 50
    end
    return true
  end

end

Any time I call terms << term (in this method or in the console or
whatever) I''m getting:

NoMethodError (You have a nil object when you didn''t expect it!
The error occurred while evaluating nil.constantize):
    (eval):7:in `before_save''
    /vendor/rails/activerecord/lib/active_record/callbacks.rb:301:in
`send''
    /vendor/rails/activerecord/lib/active_record/callbacks.rb:301:in
`callback''
    /vendor/rails/activerecord/lib/active_record/callbacks.rb:206:in
`create_or_update''
    /vendor/rails/activerecord/lib/active_record/base.rb:2151:in
`save_without_validation!''
    /vendor/rails/activerecord/lib/active_record/validations.rb:927:in
`save_without_dirty!''
    /vendor/rails/activerecord/lib/active_record/dirty.rb:82:in
`save_without_transactions!''
    /vendor/rails/activerecord/lib/active_record/transactions.rb:
110:in `save!''
    /vendor/rails/activerecord/lib/active_record/connection_adapters/
abstract/database_statements.rb:66:in `transaction''
    /vendor/rails/activerecord/lib/active_record/transactions.rb:79:in
`transaction''
    /vendor/rails/activerecord/lib/active_record/transactions.rb:98:in
`transaction''
    /vendor/rails/activerecord/lib/active_record/transactions.rb:
110:in `save!''
    /vendor/rails/activerecord/lib/active_record/transactions.rb:
118:in `rollback_active_record_state!''
    /vendor/rails/activerecord/lib/active_record/transactions.rb:
110:in `save!''
    /vendor/rails/activerecord/lib/active_record/validations.rb:898:in
`create!''
    /vendor/rails/activerecord/lib/active_record/associations/
has_many_through_association.rb:60:in `<<''
    /vendor/rails/activerecord/lib/active_record/base.rb:1801:in
`with_scope''
    /vendor/rails/activerecord/lib/active_record/associations/
has_many_through_association.rb:60:in `send''
    /vendor/rails/activerecord/lib/active_record/associations/
has_many_through_association.rb:60:in `<<''
    /vendor/rails/activerecord/lib/active_record/associations/
has_many_through_association.rb:56:in `each''
    /vendor/rails/activerecord/lib/active_record/associations/
has_many_through_association.rb:56:in `<<''
    /vendor/rails/activerecord/lib/active_record/connection_adapters/
abstract/database_statements.rb:66:in `transaction''
    /vendor/rails/activerecord/lib/active_record/transactions.rb:79:in
`transaction''
    /vendor/rails/activerecord/lib/active_record/associations/
has_many_through_association.rb:55:in `<<''
    /app/models/user.rb:50:in `add_term''


Anyone have any idea''s? I''m running edge rails from last week.

Thanks,
BJ

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