从 db 获取选项 Active Storage 变体的最佳方法是什么？

Question

我需要从数据库中获取变体 Active Storage (Ruby on Rails 6.1) 的选项（例如 resize_to_limit: [300, 222], kuwahara: '3%' ）。 我的决定：

app/admin/slideshow.rb

form do |f|
  f.inputs 'Slideshow' do
  f.input :name
  f.input :options,
          input_html: { value: f.object.options || "{ resize_to_limit: [300, 222], kuwahara: '3%' }" },
          label: 'Options. For example: { resize_to_limit: [300, 222], monochrome: true }'
  f.input :images, as: :file, input_html: { multiple: true }
  end
  f.actions
end

app/controllers/slideshow_controllers.rb

  def options
   @options = proc {
   $SAFE = 1
   eval(Slideshow.take.options) if slideshow
}.call
  end

  def slideshow
   Slideshow.published.take
  end

index.html.erb

<% if slideshow_present? %>
    <% @slideshow.images.each do |x| %>
        <a href="<%= path_to_file(x) %>" data-lightbox="photo" class="col-sm-4">
        <%= image_tag x.variant(@options),
                :class => "img-fluid" %>
        </a>
    <% end %>
<% end %>

app/helpers/slideshows_helper.rb

  def path_to_file(x)
   Rails.application.routes.url_helpers.rails_blob_path(x, only_path: true)
  end

但我认为使用 eval 并不是最好的方法。或许您可以为我推荐最好的解决方案？

附：是否建议使用 Ruby 安全级别？

Answer 1

这很简单...

app/admin/slideshow.rb

  form do |f|
    f.inputs 'Slideshow' do
      f.input :name
      f.input :options,
              input_html: { value: f.object.options || '{ "resize_to_limit": [300, 222], "kuwahara": "3%", "quality": 15 }' },
              label: 'Options. For example: { "resize_to_limit": [300, 222], "monochrome": true }'
      f.input :images, as: :file, input_html: { multiple: true }
    end
    f.actions
  end

app/controllers/slideshow_controllers.rb

  def options
    #     @options = proc {
    #       $SAFE = 1
    #       eval(Slideshow.take.options) if slideshow
    #     }.call
    @options = JSON.parse(Slideshow.take.options) if slideshow
  end

For example