Rails - Jul 2007 - has_many polymorphics problems

I have this situation:

A ''processable'' model has_many :preprocessors and/or
:postprocessors

I do that:

# @processor_and_processable.id # @processor_and_processable.processable_id #
@processor_and_processable.processable_type #
@processor_and_processable.processor_id #
@processor_and_processable.processor_type #
@processor_and_processable.created_at # @processor_and_processable.updated_at #
@processor_and_processable.lock_version # @processor_and_processable.created_by
# @processor_and_processable.updated_by #
class ProcessorAndProcessable < ActiveRecord::Base
  belongs_to :postprocessor, :foreign_key => :processor_id
  belongs_to :preprocessor, :foreign_key => :processor_id
  belongs_to :processable, :polymorphic => true
end

# @foo.somethingclass Foo < ActiveRecord::Base
  has_many :processor_and_processables, :as => :processable
  has_many :preprocessors, :through => :processor_and_processables
  has_many :postprocessors, :through => :processor_and_processables
end

# @processor.id # @processor.descripcion # @processor.task # @processor.type #
@processor.created_at # @processor.updated_at # @processor.lock_version #
@processor.created_by # @processor.updated_by #
class Processor < ActiveRecord::Base
end

class Postprocessor < Processor
   has_many :processor_and_processables,
            :foreign_key => "processor_id",
         :conditions => [''processor_type
=?'',''Postprocessor'']
   has_many :processables,  :through => :processor_and_processables
end

class Preprocessor < Processor
   has_many :processor_and_processables,
      :foreign_key => ''processor_id'',
         :conditions => [''processor_type
=?'',''Preprocessor'']
   has_many :processables,  :through => :processor_and_processables
end

---------------

...later in the console
>foo = Foo.new
>foo.postprocessors
[]
>foo.preprocessors
[]
>foo.postprocessors << Postprocessor.new(:task =>
"send_mails_to_subscripted_users")
ActiveRecord::HasManyThroughCantAssociateNewRecords: Cannot associate
new records through ''Foo#processor_and_processables'' on
''#''. Both
records must have an id in order to create the has_many :through record
associating them.


Help!
Juan Matias.

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This one is not the best way. We create the relationship manualy.
I hope that help you.

#  id               :integer(11)   not null, primary key
#  processable_id   :integer(11)
#  processable_type :string(255)
#  processor_id     :integer(11)
#  pre              :boolean(1)
#  post             :boolean(1)
class ProcessorAndProcessable < ActiveRecord::Base
   belongs_to :processor
   belongs_to :processable, :polymorphic => true
end

#  id               :integer(11)   not null, primary key
#  something        :string(255)
class Foo < ActiveRecord::Base
  has_many :processor_and_processables, :as => :processable
  has_many :preprocessors, :through => :processor_and_processables, 
:source => :processor, :conditions => "pre=true and post=false"
  has_many :postprocessors, :through => :processor_and_processables, 
:source => :processor, :conditions => "post=true and pre=false"
end


# @processor.id # @processor.descripcion # @processor.task class Processor <
ActiveRecord::Base
   has_many :processor_and_processables
end

Juan Matias
-- 
Posted via http://www.ruby-forum.com/.

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