如何使用Carrierwave和MiniMagick (Ruby on Rails)将PDF转换为图像数组。

gem 'carrierwave'
gem 'mini_magick'

class PdfUploader < CarrierWave::Uploader::Base
  storage :file

  def store_dir
    'uploads/pdf'
  end

  def extension_white_list
    %w(pdf)
  end
end

class Document < ApplicationRecord
  mount_uploader :pdf, PdfUploader
end

class DocumentsController < ApplicationController
  def create
    document = Document.new(document_params)
    if document.save
      # 获取上传的PDF文件路径
      pdf_path = document.pdf.current_path

      # 使用MiniMagick将PDF转换为图像数组
      images = MiniMagick::Image.open(pdf_path) do |pdf|
        pdf.pages.each_with_index.map do |page, index|
          page.format "png"
          page.write "#{pdf_path}_#{index}.png"
          "#{pdf_path}_#{index}.png"
        end
      end

      # 将图像数组保存到数据库或进行其他操作
      document.update(images: images)

      redirect_to document
    else
      render :new
    end
  end

  private

  def document_params
    params.require(:document).permit(:pdf)
  end
end