ruby on rails: request.body.read shows error - ruby

Question

I have implemented AJAX based upload in my rails project.
This is my example code. (I followed the tutorial from here.. https://github.com/valums/file-uploader)
********** Javascript Code **********
function createUploader(){
var uploader = new qq.FileUploader({
element: document.getElementById('file-uploader'),
action: '/product/upload',
});
}
window.onload = createUploader;
********** Server side **********
def upload
#filename = params['qqfile']
f = File.open('home/files/' + #filename, "wb")
str = request.body.read
f.write(str)
f.close
render :text => '{success:true}'
end
When i run my code i got the following error message in the line "str = request.body.read"
NoMethodError (undefined method `body' for #<ActionController::CgiRequest:0xb6cd71a0>):
error details More: http://www.heypasteit.com/clip/01NE
My configuration:
[mrblack# home]# ruby -v
ruby 1.8.7 (2008-08-11 patchlevel 72) [i686-linux]
[mrblack# home]# rails -v
Rails 1.2.1
[mrblack# home]# gem -v
1.8.6
Can you please clear me, what did i wrong?

Answer 1

Becasue in Rails 1.2.1 neither ActionController::CgiRequest nor its parent ActionController::AbstractRequest contains 'body' method. You can see it if you look at these pages: cgi_process.rb and request.rb. Why do you use such old rails version??
UPDATE
#Mr. Black. You wrote "Can you please tell me any alternate way to read the incoming request similar to this request object".
You're using 'file-uploader' library from github. As I can see, that library can upload files to server side by two ways. If user has old FF, Chrome browsers or any IE version that library make a post request to iframe. If user has modern FF or Chrome version library prepares async post xmlHttpRequest. Therefore, in our rails controller we have to handle both situation. For example, for simplicity we want to write sended file data to some hard-coded place on disk.
******** app/controllers/greetings_controller.rb ********
class GreetingsController < ApplicationController
def upload
begin
is_xhr = params[:qqfile].is_a? String
data = is_xhr ? request.body : params[:qqfile]
File.open("/some_place_on_disk/bar.txt", "w") { |f| f.write(data.read) }
#result = {success: true}
if is_xhr
render :json => #result
end
# else render view
rescue Exception => e
logger.info e
#result = {error: "Error has been encountered during the processing"}
end
end
end
******** app/views/upload.html.erb ********
<%= #result.to_json %>
******** config/routes.rb ********
.....
match '/upload' => 'greetings#upload', :via => :post
.....
You can use demo.htm from github project, but you have to place it into public folder. Don't forget about fileuploader.css and fileuploader.js! :) You must change 'action' in createUploader function to action path, in my case that would be '/upload'