Question

I want to build 3 step user registration with avatar uploading on 2nd step. So i follow Ryan Bates’s guide http://railscasts.com/episodes/217-multistep-forms . I’m using CarrierWave gem to handle uploads. But it seems like i can’t store uploaded file info in user session (i’m getting can’t dump File error). I use following technique in controller

if params[:user][:img_path]
  @uploader = FirmImgUploader.new
  @uploader.store!(params[:user][:img_path])
  session[:img] = @uploader
  params[:user].delete(:img_path)
end

It actually helps. But when i upload forbidden file type everything’s crashes on this line

@uploader.store!(params[:user][:img_path])

with this error

CarrierWave::IntegrityError in UsersController#create
You are not allowed to upload "docx" files, allowed types: ["jpg", "jpeg", "gif", "png"]

instead of normal form validation error.

How can i solve this problem ? Thanks !

Answer 1

Actually I solved my problem. Here’s working code for multistep forms with file uploading using carrierwave

if params[:user][:img_path]
  @uploaded = params[:user][:img_path]
  params[:user].delete(:img_path)
end
session[:user_data].deep_merge!(params[:user]) if params[:user]
@user = User.new(session[:user_data])    

if @uploaded
  # here how validation will work
  @user.img_path = @uploaded
end
@user.current_stage = session[:register_stage]
if @user.valid?
  if @user.last_stage?
    @user.img_path  = session[:img] if @user.last_stage?
    @user.save
  else  
    @user.next_stage
  end
  # now we can store carrierwave object in session
  session[:img] = @user.img_path
  session[:register_stage] = @user.current_stage
end