Rails 4-验证在循环中是否至少以嵌套形式选中了一个复选框

class MyModel < ActiveRecord::Base
  validate :at_least_one_checkbox_selected

  def at_least_one_checkbox_selected
    # 检查是否至少选中了一个复选框
    if checkboxes.none?(&:checked?)
      errors.add(:base, "至少选择一个复选框")
    end
  end
end

<%= form_for @my_model do |f| %>
  <%= f.fields_for :checkboxes do |checkbox_fields| %>
    <%= checkbox_fields.check_box :checked %>
    <%= checkbox_fields.label :checked, "复选框" %>
  <% end %>
  <%= f.submit "提交" %>
<% end %>

class MyModelsController < ApplicationController
  def create
    @my_model = MyModel.new(my_model_params)
    if @my_model.save
      # 保存成功的处理逻辑
    else
      # 保存失败的处理逻辑
    end
  end

  private

  def my_model_params
    params.require(:my_model).permit(checkboxes_attributes: [:checked])
  end
end