Alternative to render :update

rubyonrails-talk
1

Hi guys and gals.

I don't know how to explain this too well, so I'll try my best and post some obviously dysfunctional code (just so you can get the idea of what I'm after if my explanation doesn't do it.)

What I want to do is create an upload form that users can upload more than one item with. The catch is I want to use ajax to pull off an insert_html and update the page showing thumbnail to each file as it's added, while the other files are being uploaded. So, let's say I upload 3 files, when the first one finishes it's inserted to an unordered list (via ajax, without reloading the page while the other two files are still uploading), then the next file, then the last file and it ends. I've been doing it fine with a single file, but now that I've added multiple file uploads that controller style won't work.

Doing something like this, which I figured was a 1,000,000:1 shot at it working (of course, it didn't) gives a DoubleRender error which I expected:

def create   @project = Project.find(params[:id])

  params[:attachment].each do |key, value|     if value and value != ''       @file = Image.new(Hash['uploaded_data' => value])       @file.user_id = logged_in_user.id       @file.project_id = @project.id

      respond_to do |format|         if @file.save           format.js do                   responds_to_parent do                     render :update do |page|                 page.insert_html :top, "images", :partial => 'image', :object => @file                     end                   end           end         else           # etc...         end       end     end   else     # etc.   end

Can this sort of thing even be pulled off?

2

You want to execute multiple inserts in a single response, not multiple responses. This might work, assuming that the rest of your code works and that you are using attachments as the relationship name.

def create   @project = Project.find(params[:id])

  params[:attachment].each do |key, value|     if value and !value.blank?       new_file = Image.new(Hash['uploaded_data' => value])       new_file.user_id = logged_in_user.id       @project.attachments << new_file     end   end

  respond_to do |format|     if @project.save       format.js do         render :update do |page|           @project.attachments.each do |file|             page.insert_html :top, "images", :partial => 'image', :object => file           end         end       end     end   end end

3

Google for a Rails version of swfupload... in the Rails code it updates the thumbnails as it processes the files.

4

If that's the case, then you should split it up into multiple requests. I believe that you can only send back one response per request, so that is an inherent problem.

Perhaps you may try sending a request once the a valid file is selected in the file upload field.