如何在Rails中检索图像的EXIF信息

# Gemfile
gem 'exifr'

# app/controllers/images_controller.rb
class ImagesController< ApplicationController
  def show
    @image = params[:id]
    @exif_data = EXIFR::JPEG.new("#{Rails.root}/public/images/#{@image}.jpg").exif
  end
end

<!-- app/views/images/show.html.erb -->
<h1>EXIF信息</h1><table>
  <tr>
    <th>属性</th>
    <th>值</th>
  </tr>
  <% @exif_data.tags.each do |tag, value| %>
    <tr>
      <td><%= tag %></td>
      <td><%= value %></td>
    </tr>
  <% end %>
</table>