验证依赖于其他模型的活动记录的模型值？

发布于 2024-11-10 01:10:59 字数 511 浏览 0 评论 0原文

我有两个模型：

class Category < ActiveRecord::Base
  has_one :weight
  after_create :create_category_weight

  def create_category_weight
    self.weight = Weight.new :value => 1/Category.count
  end

end

和..

class Weight < ActiveRecord::Base
  belongs_to :category
  attr_accessible :value
end

我想可靠地将值设置为（1/类别数）。我希望这能在category.build_weight、category.new、category.create等情况下工作。我已经尝试了上述方法，以及使用观察者，但它很脆弱。关于不同架构方法的建议也受到赞赏。

谢谢，贾斯汀

原文

I have two models:

class Category < ActiveRecord::Base
  has_one :weight
  after_create :create_category_weight

  def create_category_weight
    self.weight = Weight.new :value => 1/Category.count
  end

end

and..

class Weight < ActiveRecord::Base
  belongs_to :category
  attr_accessible :value
end

I want to reliably set value to be (1/number of categories). I'd like this to work in the case of category.build_weight, category.new, category.create etc. I've tried the above approach, as well as using an observer, but its brittle. Suggestions on different architectural approaches also appreciated.

Thanks,
Justin

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清醇 2024-11-17 01:10:59

我会将创建逻辑从 ActiveRecord 模型中提取出来并放入另一个类中。像这样的东西：

class CategoryRepository

  def new_category
    @category = Category.new
    @category.weight = Weight.new(:value => (1 / Category.count))
    @category
  end

  def create_category(attributes)
    @category = Category.create(attributes)
    @category.weight = Weight.new(:value => (1 / Category.count))
    @category.save
    @category
  end

end

@repository = CategoryRepository.new

@category = @repository.new_category

@category = @repository.create_category(params[:category])

I would extract the creation logic out of the ActiveRecord model and into another class. Something like:

class CategoryRepository

  def new_category
    @category = Category.new
    @category.weight = Weight.new(:value => (1 / Category.count))
    @category
  end

  def create_category(attributes)
    @category = Category.create(attributes)
    @category.weight = Weight.new(:value => (1 / Category.count))
    @category.save
    @category
  end

end

@repository = CategoryRepository.new

@category = @repository.new_category

@category = @repository.create_category(params[:category])

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