如何在rails中获取所有儿童的活动存储附件？

class Child < ApplicationRecord
  has_many_attached :activity_attachments
end

rails generate migration CreateActivityAttachments
rails db:migrate

class ChildrenController < ApplicationController
  def index
    @children = Child.all
    @activity_attachments = @children.map { |child| child.activity_attachments }
  end
end

<% @activity_attachments.each do |attachments| %>
  <% attachments.each do |attachment| %>
    <%= image_tag attachment %>
  <% end %>
<% end %>