Ruby on rails 如何删除表及其子表中的记录？

我想创建一个链接来删除一条记录及其在外部表中的子记录。 我的模型是这样的：

class Cv < ActiveRecord::Base
  has_many :formation
end

class Formation < ActiveRecord::Base
  belongs_to :cv
  validates :cv_id, presence: true
end

我该怎么做？

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提前感谢。

如果您要向关系中添加从属关系，它也将从外键表中删除其所有关联记录

class Cv < ActiveRecord::Base
  has_many :formation, dependent: destroy
end

您需要将dependent:：destroy添加到您的编队模型中，以便删除关联的记录

class Formation < ActiveRecord::Base
  belongs_to :cv, dependent: :destroy
  validates :cv_id, presence: true
end

---

谢谢你的帮助

<%= link_to 'delete', @cv, :data => {:confirm => 'Are you sure?'}, :method => :delete %>

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外部表中的子记录？你是说相关记录吗？是的，我是说。我的队形表中有外键，你能发布你的路线吗？谢谢，但我删除的链接正确吗？那么detroy方法使用哪种呢？请

class Formation < ActiveRecord::Base
  belongs_to :cv, dependent: :destroy
  validates :cv_id, presence: true
end

<%= link_to 'delete', cvsdestroy_path(p), method: :delete %>

<%= link_to 'delete', @cv, :data => {:confirm => 'Are you sure?'}, :method => :delete %>

def destroy
    @cvdestroy = Cv.find(params[:id])
    @cvdestroy.destroy
    redirect_to cvs_path, :notice => "Your CV has been deleted"
end