ruby-on-rails – 如何在生产轨道中提供指纹css路径4

RAILS_ENV =生产包exec rake资产：预编译预编译我的资产.

app / assets目录的所有文件都编译为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未找到错误…

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

我使用https://github.com/csquared/IMGKit/issues/36来获取CSS并在我的快照中工作

编辑

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',: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",: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