Question

我正在尝试使用wkhtmltopdf渲染我的模型的pdf，其中包含使用dragonfly存储的图像，但我无法使其工作。当我使用wkhtmltopdf的调试选项时，html页面呈现正常，但pdf本身只是得到一个空白框，图像应该在那里。到目前为止，我只找到了两个提出这个问题的网站（a german blog和a google forum thread），但这两个解决方案都没有为我解决。我怀疑我应该使用blog中建议的图像文件的绝对路径，但是当我尝试该解决方案时，服务器卡在：

a = [{"name" => "name1", "folder" => "folder1", 'id' => 1 },
{"name" => "name1", "folder" => "folder1", 'id' => 2 },
{"name" => "name1", "folder" => "folder2", 'id' => 3},
{"name" => "name2", "folder" => "folder1", 'id' => 4}]

a.group_by { |c| c['name'] }.map do |key, value| 
   [key, [value.group_by { |c| c['folder']}]]
end.to_h

 => {"name1"=>
       [{"folder1"=>[
          {"name"=>"name1", "folder"=>"folder1", "id"=>1},
          {"name"=>"name1", "folder"=>"folder1", "id"=>2}],   
         "folder2"=>[
          {"name"=>"name1", "folder"=>"folder2", "id"=>3}]}],    
     "name2"=>
       [{"folder1"=>[
          {"name"=>"name2", "folder"=>"folder1", "id"=>4}]}]
     }

我的代码如下所示：

image.rb

Rendered images/show.pdf.erb (19.9ms) 
"***************[\"/home/oskar/.rbenv/versions/2.2.3/bin/wkhtmltopdf\",
\"-q\", \"--encoding\", \"utf8\", \"--orientation\", \"Landscape\", 
\"file:////tmp/wicked_pdf20161007-8095-1nlruhe.html\", \"/tmp
/wicked_pdf_generated_file20161007-8095-1f6vr27.pdf\"]***************"

images_controller.rb：

class Image < ActiveRecord::Base
  dragonfly_accessor :image
end

show.pdf.erb：

def show
  respond_to do |format|
    format.html
    format.pdf do
      render pdf: 'name',
             background: true,
             encoding: 'utf8',
             orientation: 'Landscape',
             :show_as_html => params[:debug].present?
    end
  end
end

image.url = <% if params[:debug].present? %> <%= stylesheet_link_tag 'document' %> <%= stylesheet_link_tag 'pdf' %> <% else %> <%= wicked_pdf_stylesheet_link_tag 'document' %> <%= wicked_pdf_stylesheet_link_tag 'pdf' %> <% end %> ... <%= image_tag image.url if image.image_stored? %> ...

任何建议都将不胜感激！

Answer 1

我知道，我的解决方案很难看。但它有效：）

totalValue = 20 # of 'a'
#OR
totalValue = 50 # of 'b'
#OR
totalValue = 20 # of 'c'

现在我渲染这样的图像：

myFile = open("file.txt", "r")

while True:
    theline = myFile.readline()
    if "a" in theline:     #Just used 'a' here as an example.
        for char in theline:
            ...        

myFile.close()

现在，您甚至可以附加def self.export_to(path) all.each do |image_model| image_model.image.to_file(Rails.root.join("tmp","image", image.id.to_s)) end end回调来删除图片。

Answer 2

诀窍是使用：image_tag(logo.path)

请注意image_tag和path代替wicked_pdf_image_tag和url的使用情况。

Answer 3

您需要将image_tag替换为wicked_pdf_image_tag

<%= wicked_pdf_image_tag image.url if image.image_stored? %>

Answer 4

这适用于我使用路径

<img src="<%=Rails.root.join(image.path)%>" >

如果图像对象是孩子

<img src="<%=Rails.root.join(parentObject.image.path)%>" >

使用wicked-pdf以PDF格式渲染Dragonfly图像

4 个答案: