我在使用Wicked_PDF渲染PDF时遇到问题。我正在使用Amazon S3和CloudFront托管我的所有资产管道资源,并且在开发过程中生成的东西很好;但是在生产中,HTML和CSS资产不会在生成的PDF中呈现。
我正在运行Rails 3.2.11,Ruby 1.9.3p327,MAC OSX 10.8.2,wkhtmltopdf 0.9.9,以及当前版本的Wicked_PDF和wkhtmltopdf-heroku。
以下是所有相关信息:
Heroku Logs:
2013-04-21T14:13:19.482011+00:00 app[web.1]: Completed 302 Found in 212ms (ActiveRecord: 205.6ms)
2013-04-21T14:13:19.584108+00:00 app[web.1]: Started GET "/office/download/7" for ip_address at 2013-04-21 14:13:19 +0000
2013-04-21T14:13:21.551581+00:00 app[web.1]: Processing by OfficesController#show_pdf as HTML
2013-04-21T14:13:21.551581+00:00 app[web.1]: ***************WICKED***************
2013-04-21T14:13:21.551581+00:00 app[web.1]: Parameters: {"office_id"=>"7"}
2013-04-21T14:13:21.551581+00:00 app[web.1]: Rendered appointments/forms/_office.pdf.html.erb within layouts/pdf.html (13.6ms)
2013-04-21T14:13:21.551581+00:00 app[web.1]: Rendered text template (0.0ms)
2013-04-21T14:13:21.551581+00:00 app[web.1]: Sent data Office.pdf (42.2ms)
2013-04-21T14:13:21.551581+00:00 app[web.1]: Completed 200 OK in 1961ms (Views: 41.9ms | ActiveRecord: 7.8ms)
2013-04-21T14:13:21.554211+00:00 heroku[router]: at=info method=GET path=/office/download/7
host=www.foobar.com fwd="ip_address" dyno=web.1 connect=1ms service=1971ms status=200 bytes=22019
路线:
# => Route that generates the PDF
get "/office/download/:office_id" => 'offices#show_pdf'
控制器:
# => app/controllers/offices_controller.rb
def show_pdf
@office = Office.find_by_id(params[:office_id])
abrv = @office.abrv
partial = "appointments/forms/_#{abrv}"
@format = "pdf"
respond_to do |format|
format.pdf do
render :pdf => "#{@office.name}",
:template => "#{partial}.pdf.html.erb",
:layout => "pdf.html",
:page_size => "A4",
:encoding => "UTF-8",
:show_as_html => params[:debug].present?
end
end
end
查看:
# => app/views/offices/index
<div>
# List of all offices
</div>
# PDF partials for each office
<%= render 'appointments/forms/office.pdf.html.erb' %>
<%= render 'appointments/forms/office_1.pdf.html.erb' %>
...
PDF模板:
# => app/views/appointments/forms/_office.pdf.html.erb:
<% if @format != 'pdf' %>
<%= stylesheet_link_tag 'office' # => .css.scss.erb %>
<% else %>
<%= wicked_pdf_stylesheet_link_tag 'office' # => .css.scss.erb %>
<% end %>
<div class="pdf_styling">
<p>Bar</p>
</div>
CSS:
# => app/assets/stylesheets/office.css.scss.erb
.pdf_styling {
background-image: url('https://s3.amazonaws.com/foo/assets/pdf_background_image.jpg');
width: 100%;
height: 100%;
p {
position: absolute;
left: 100px;
right: 100px;
}
}
Wicked_PDF初始化程序:
# => config/initializers/wicked_pdf.rb
WICKED_PDF = {
:wkhtmltopdf => (Rails.env.test? || Rails.env.development? ? '/usr/local/bin/wkhtmltopdf' : Rails.root.join('bin', 'wkhtmltopdf-amd64').to_s),
:exe_path => (Rails.env.test? || Rails.env.development? ? '/usr/local/bin/ ' : Rails.root.join('vendor','bin', 'wkhtmltopdf-amd64').to_s)
}
的Gemfile:
# PDF Gem
gem 'wicked_pdf'
# PDF to HTML utility
gem 'wkhtmltopdf-binary'
# PDF on heroku
group :production do
gem "wkhtmltopdf-heroku", :git => 'git://github.com/camdez/wkhtmltopdf-heroku.git'
gem 'thin'
end
# Asset Pipeline Optimization
gem "asset_sync"
同样,一切都在开发中运行良好,但我只是在生产中得到一个空白的PDF页面。日志中不会引发任何错误。这可能是dynos太少的问题吗?
我承认这是所有这一切的n00b;原谅我。感谢。
答案 0 :(得分:4)
在Heroku中部署到生产时遇到了同样的问题。
要解决的两个可能区域......首先,必须将每个Javascript或CSS资源文件指定为绝对URL,而不仅仅是您在模板代码中指定的URL。如果您在其他地方引用了任何JS / CSS文件,则还必须以绝对形式指定这些文件。因此,您还需要查看您的pdf布局文件
其次(这就是我在Heroku上的诀窍),我最后必须在config / application.rb中指定我的每一个资源:
config.assets.precompile += ['blueprint/screen.css', 'jquery.timepicker.css', 'pdf.css', 'jquery.ui.datepicker.js', 'pdf.js', 'jquery.autosize.js', 'jquery.timepicker.js']
我不确定为什么第二步是必需的,但没有它,Heroku上没有任何工作:我得到了相同的空白PDF,没有你报告的错误,甚至认为一切都在开发中。我的经验是,如果存在资源问题,wkhtmltopdf将无声地失败。我在博客上发布了问题here,并推出了对WickedPDF README文档的更新,这可能会有所帮助。