如何在生产rails 4中提供指纹css路径

Question

我正在使用imgkit 拍摄我的网页快照。我跑：

RAILS_ENV=production bundle exec rake assets:precompile 预编译我的资产。

app/assets目录下的所有文件都编译成public/assets application.css 编译为application-7a23a105125768e41d9d24aee4553615.css。

我的控制器代码是：

  kit = IMGKit.new(render_to_string(:partial => 'form', :height => 200, :transparent => true, :quality => 10, :layout => false,:locals => {:project => @project}))
  #  t = kit.to_img(:png) 
  kit.stylesheets << "#{Rails.root.to_s}/public/assets/application.css"
  #file = kit.to_file(Rails.root + "public/pngs/" + "screenshot.png")
  file = kit.to_file(Rails.root + "public/assets/" + "screenshot.png")
  #send_file("#{Rails.root.to_s}/public/pngs/screenshot.png", :filename => "screenshot.png", :type => "image/png",:disposition => 'attachment',:streaming=> 'true')

我不知道如何解决/public/assets/application.css not found 错误...

没有这样的文件或目录 - public/assets/application.css

我正在使用 https://github.com/csquared/IMGKit/issues/36 获取 css 并在我的快照中工作

修改

def update
#@kit = IMGKit.new(render_to_string, width: 480, height: 800, :quality => 100)
  respond_to do |format|
   if @project.update(project_params)
    kit = IMGKit.new(render_to_string(:partial => 'form', :height => 200, :transparent => true, :quality => 10, :layout => false,:locals => {:project => @project}))
  #  t = kit.to_img(:png) 
  kit.stylesheets << "self.class.helpers.asset_path('application.css')"
    #file = kit.to_file(Rails.root + "public/pngs/" + "screenshot.png")
 file = kit.to_file(Rails.root + "public/assets/" + "screenshot.png")
 #send_file("#{Rails.root.to_s}/public/pngs/screenshot.png", :filename => "screenshot.png", :type => "image/png",:disposition => 'attachment',:streaming=> 'true')
    format.html { redirect_to root_path, notice: 'Flyer was successfully updated.' }
    format.json { render :show, status: :ok, locatioFlyern: @project }
  else
    format.html { render :edit }
    format.json { render json: @project.errors, status: :unprocessable_entity }
  end
 end
end

Answer 1

您可以使用Sprockets::Rails::Helper#asset_digest_path，找到here。由于您在控制器中，因此您可以访问它

self.class.helpers.asset_digest_path('application.css')
# => "application-7a23a105125768e41d9d24aee4553615.css"

同样，asset_path 将生成 application.css 文件的路径

self.class.helpers.asset_path('application.css')
# => "/assets/application-7a23a105125768e41d9d24aee4553615.css"