curriculum.rb

### using 1 model for modules

class CercaModule
  has_many: sugestions
  has_many: lessons
  
  # attributes: lesson_module_type # "collection_module" || "lesson_module"
end

class Sugestion
  belongs_to :lesson
  belongs_to :cerca_module
end

### using two models for modules

class CercaModule
  has_many: sugestions
  has_many: lessons
end

class Sugestion
  belongs_to :lesson
  belongs_to :lesson_module # this can be change to only use lesson_modules types
end

class LessonModule < CercaModule
end

class CollectionModule < CercaModule
end