ruby-on-rails - accept_nested_attributes_for :destroy_if

Question

我在一个类中有一个 accept_nested_attributes_for 的 :reject_if 案例，但如果某个值为 0，我也希望能够销毁已经创建的对象。

似乎没有 :destroy_if 选项。有没有标准的方法来控制这样的情况？

Answer 1

我找到了使用 before_save 的解决方案。这似乎工作得很好。

before_save :mark_entries_for_removal

def mark_entries_for_removal
  entries.each do |entry|
    entry.mark_for_destruction if entry.hours_spent <= 0
  end
end

Answer 2

A nested model is destroyed when its attribute _destroy is set (1 or true)

A solution is to overload your_nested_model_attributes= to set the _destroy attribute to 1