Ruby-on-rails Rails 3 获取原始发布数据并将其写入 tmp 文件
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Rails 3 get raw post data and write it to tmp file
提问by Andrew
I'm working on implementing Ajax-Uploadfor uploading photos in my Rails 3 app. The documentation says:
我正在实施Ajax-Upload，以便在我的 Rails 3 应用程序中上传照片。文档说：
For IE6-8, Opera, older versions of other browsers you get the file as you normally do with regular form-base uploads.
For browsers which upload file with progress bar, you will need to get the raw post data and write it to the file.
对于 IE6-8、Opera、其他浏览器的旧版本，您可以像通常使用常规的基于表单的上传一样获取文件。
对于使用进度条上传文件的浏览器，您需要获取原始帖子数据并将其写入文件。
So, how can I receive the raw post data in my controller and write it to a tmp file so my controller can then process it? (In my case the controller is doing some image manipulation and saving to S3.)
那么，如何在我的控制器中接收原始发布数据并将其写入 tmp 文件，以便我的控制器可以处理它？（在我的例子中，控制器正在做一些图像处理并保存到 S3。）
Some additional info:
一些额外的信息：
As I'm configured right now the post is passing these parameters:
正如我现在配置的那样，帖子正在传递这些参数：
Parameters:
{"authenticity_token"=>"...", "qqfile"=>"IMG_0064.jpg"}
... and the CREATE action looks like this:
... CREATE 操作如下所示：
def create
@attachment = Attachment.new
@attachment.user = current_user
@attachment.file = params[:qqfile]
if @attachment.save!
respond_to do |format|
format.js { render :text => '{"success":true}' }
end
end
end
... but I get this error:
...但我收到此错误：
ActiveRecord::RecordInvalid (Validation failed: File file name must be set.):
app/controllers/attachments_controller.rb:7:in `create'
回答by Stefaan Colman
That's because params[:qqfile] isn't a UploadedFile object but a String containing the file name. The content of the file is stored in the body of the request (accessible by using request.body.read). Ofcourse, you can't forget backward compatibility so you still have to support UploadedFile.
那是因为 params[:qqfile] 不是 UploadedFile 对象，而是一个包含文件名的字符串。文件的内容存储在请求的正文中（可使用request.body.read访问）。当然，你不能忘记向后兼容，所以你仍然必须支持UploadedFile。
So before you can process the file in a uniform way you have to catch both cases:
因此，在以统一方式处理文件之前，您必须捕获两种情况：
def create
ajax_upload = params[:qqfile].is_a?(String)
filename = ajax_upload ? params[:qqfile] : params[:qqfile].original_filename
extension = filename.split('.').last
# Creating a temp file
tmp_file = "#{Rails.root}/tmp/uploaded.#{extension}"
id = 0
while File.exists?(tmp_file) do
tmp_file = "#{Rails.root}/tmp/uploaded-#{id}.#{extension}"
id += 1
end
# Save to temp file
File.open(tmp_file, 'wb') do |f|
if ajax_upload
f.write request.body.read
else
f.write params[:qqfile].read
end
end
# Now you can do your own stuff
end
回答by super_p
try it, add lib/qq_file.rb:
试试吧，添加lib/qq_file.rb：
# encoding: utf-8
require 'digest/sha1'
require 'mime/types'
# Usage (paperclip example)
# @asset.data = QqFile.new(params[:qqfile], request)
class QqFile < ::Tempfile
def initialize(filename, request, tmpdir = Dir::tmpdir)
@original_filename = filename
@request = request
super Digest::SHA1.hexdigest(filename), tmpdir
fetch
end
def self.parse(*args)
return args.first unless args.first.is_a?(String)
new(*args)
end
def fetch
self.write @request.raw_post
self.rewind
self
end
def original_filename
@original_filename
end
def content_type
types = MIME::Types.type_for(@request.content_type)
types.empty? ? @request.content_type : types.first.to_s
end
end
in assets_controller type this:
在 assets_controller 中输入：
def create
@asset ||= Asset.new(params[:asset])
@asset.assetable_type = params[:assetable_type]
@asset.assetable_id = params[:assetable_id] || 0
@asset.guid = params[:guid]
@asset.data = QqFile.parse(params[:qqfile], request)
@asset.user_id = 0
@success = @asset.save
respond_with(@asset) do |format|
format.html { render :text => "{'success':#{@success}}" }
format.xml { render :xml => @asset.to_xml }
format.js { render :text => "{'success':#{@success}}"}
format.json { render :json => {:success => @success} }
end
end
javascript:
javascript:
var photo_uploader = new qq.FileUploader({
element: document.getElementById('photo-button'),
multiple: true,
action: '/assets',
allowedExtensions: ['png', 'gif', 'jpg', 'jpeg'],
sizeLimit: 2097152,
params: {guid: $('#idea_guid').val(), assetable_type: 'Idea', klass: 'Picture', collection: true}
});
回答by tomaszbak
Another solution is:
另一种解决方案是：
gem 'rack-raw-upload', :git => 'git://github.com/tb/rack-raw-upload.git'
and in config.ru:
在 config.ru 中：
require 'rack/raw_upload'
use Rack::RawUpload
and use params[:file] in controller.
并在控制器中使用 params[:file]。
回答by Peter Ehrlich
Rather than creating some clutter temp file, you can use StringIO. See my answer about CarrierWave, here: https://stackoverflow.com/a/8812976/478354
您可以使用 StringIO，而不是创建一些杂乱的临时文件。在此处查看我关于 CarrierWave 的回答：https://stackoverflow.com/a/8812976/478354
