Rails - Apr 2009 - ActiveRecord::HasManyThroughCantAssociateThroughHasManyReflection

Hello,

I tried the following and got that error and can''t figure out how to
fix it... I know I can do a long way to add Turmas To a Disciplina but
using like the following would be very convinient:

p = Periodo.find(:first)
d = p.disciplinas.find(13)
d.turmas.create!(:codigo => ''23A'', :horario =>
''2a e 4a -
15-17h'', :descricao => ''Turma Regular'')

ActiveRecord::HasManyThroughCantAssociateThroughHasManyReflection:
Cannot modify association ''Disciplina#turmas'' because the
source
reflection class ''Turma'' is associated to
''DisciplinaPeriodo''
via :has_many.

My models are:

class Periodo < ActiveRecord::Base
	has_many :disciplina_periodos, :dependent => :destroy
	has_many :disciplinas, :through => :disciplina_periodos

	validates_presence_of :periodo
	validates_uniqueness_of :periodo
end

class Disciplina < ActiveRecord::Base
	has_one :disciplina_periodo
	has_one :periodo, :through => :disciplina_periodo

	has_many :disciplina_periodos, :dependent => :destroy
	has_many :turmas, :through => :disciplina_periodos

	validates_presence_of :codigo, :nome
	validates_uniqueness_of :codigo
	validates_uniqueness_of :nome
end

class DisciplinaPeriodo < ActiveRecord::Base
    has_many :turmas, :dependent => :destroy
	belongs_to :periodo
	belongs_to :disciplina

	validates_presence_of :periodo_id, :disciplina_id
	validates_uniqueness_of :disciplina_id, :scope => :periodo_id
	validates_uniqueness_of :periodo_id, :scope => :disciplina_id
end

class Turma < ActiveRecord::Base
        belongs_to :disciplina_periodo
	belongs_to :disciplina
	validates_uniqueness_of :codigo, :scope => :disciplina_periodo_id
end


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