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