如何在Sinatra中使用CarrierWave显示图像

gem 'carrierwave'
gem 'mini_magick'

require 'carrierwave'
require 'carrierwave/processing/mini_magick'

class ImageUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick

  storage :file

  def store_dir
    'uploads'
  end

  version :thumb do
    process resize_to_fit: [200, 200]
  end

  def extension_whitelist
    %w(jpg jpeg gif png)
  end
end

require 'carrierwave'
require 'carrierwave/orm/activerecord'

CarrierWave.configure do |config|
  config.root = File.dirname(__FILE__) + '/public'
  config.storage = :file
end

require 'sinatra'
require 'carrierwave'
require 'carrierwave/orm/activerecord'

# ...

post '/upload' do
  uploader = ImageUploader.new
  uploader.store!(params[:image])

  # 保存图像的URL到数据库或其他地方
  image_url = uploader.url

  # 显示图像
  "<img src='#{image_url}' alt='Uploaded Image'>"
end