activemodel - Rails 5 抛出中止 : how do I setup error messages?

Question

Rails 引入了这个 throw(:abort)语法，但现在如何获得有意义的销毁错误？

对于验证错误，可以这样做

if not user.save
  # => user.errors has information

if not user.destroy
  # => user.errors is empty

这是我的模型

class User

  before_destroy :destroy_validation,
    if: :some_reason

  private

  def destroy_validation
    throw(:abort) if some_condition
  end

Answer 1

您可以使用 errors.add为您的类方法。

用户模型:

def destroy_validation
  if some_condition
    errors.add(:base, "can't be destroyed cause x,y or z")
    throw(:abort)
  end
end

用户 Controller :

def destroy
  if @user.destroy
    respond_to do |format|
      format.html { redirect_to users_path, notice: ':)' }
      format.json { head :no_content }
    end
  else
    respond_to do |format|
      format.html { redirect_to users_path, alert: ":( #{@user.errors[:base]}"}
    end
  end
end