用动态编程重构?

您可能还想看看这个网站:

http://refactormycode.com/

如果我没弄错的话,你想用同样的方法 answers 至于 materials ,但复制的代码最少。实现这一点的方法是抽象出一些私有方法,这些方法可以用于 或 save_

after_update :save_materials
after_update :save_answers  

// Public methods

def new_material_attributes=(material_attributes)
  self.new_with_attributes(materials, material_attributes)
end

def new_answer_attributes=(answer_attributes)
  self.new_with_attributes(answers, answer_attributes)
end

def existing_material_attributes=(material_attributes)
  self.existing_with_attributes(materials, material_attributes)
end

def existing_answer_attributes=(answer_attributes)
  self.existing_with_attributes(answers, answer_attributes)
end

def save_materials
  materials.each do |material|
    material.save(false)
  end
end

def save_answers
  answers.each do |answer|
     answer.save(false)
  end
end

// Private methods    

private
def new_with_atttributes(thing,attributes)
    attributes.each do |attribute|
       thing.build(attribute)
    end
end

def existing_with_attributes=(things, attributes)
  things.reject(&:new_record?).each do |thing|
    attrs = attributes[thing.id.to_s]
    if attrs
      thing.attributes = attrs
    else
      things.delete(thing)
    end
  end
end