ruby on rails - references - RoR: has_one "u otro"?(O, polimorfismo sin la herencia.)

ruby-on-rails - references - rails has_many through example - edu.lat

ruby-on-rails - inverse_of - rails references - edu.lat

belongsto - grails hasmany add to - edu.lat

ruby-on-rails - many - rails nested attributes through - edu.lat

grails hasOne vs variable miembro directo