Unexpected 'nil' in rails upload application

rubyonrails-talk
1

Hi All,

Please help. I am sure there is something obvious I am overlooking in the code but I cannot see it. Please note, as detailed below, I am on Bluehost using Rails 2.2.2.

The code is example code from TutorialsPoint - URL: Ruby on Rails - File Uploading and modified to run on Linux bluehost.

On bluehost - http://upload.datajazz.com/ gives standard 'Welcome Page' - http://upload.datajazz.com/upload/index presents html page for file upload upload file selection works failure occurs on 'Upload' button click

Issue Summary: - 'nil' whereas it should be variables being passed from uploadfile.rhtml - Line 3 in [app/models] data_file.rb     name = upload['datafile'].original_filename # Line 3 - Line 7 in [app/controllers] upload_controller.rb     post = DataFile.save(params[:upload]) # Line 7

Regards

### Environment information Hosting service: Bluehost

### Rails Environment Ruby version 1.8.6 (x86_64-linux) RubyGems version 1.3.1 Rails version 2.2.2 Active Record version 2.2.2 Action Pack version 2.2.2 Active Resource version 2.2.2 Action Mailer version 2.2.2 Active Support version 2.2.2 Application root ~/rails/upload Environment development Database adapter sqlite3 Database schema version 0

### Relevant source files ### dir: [app/models] file: data_file.rb class DataFile < ActiveRecord::Base   def self.save(upload)     name = upload['datafile'].original_filename # Line 3

    directory = "public/data"     # create the file path     path = File.join(directory, name)     # create or over-write file 'path' with 'datafile' contents     File.open(path, "wb") { |f| f.write(upload['datafile'].read) }   end end

### dir: [app/controllers] file: upload_controller.rb class UploadController < ApplicationController   def index      render :file => 'upload/uploadfile.rhtml'   end

  def uploadFile     post = DataFile.save(params[:upload]) # Line 7     render :text => "File has been uploaded successfully"   end

end

### dir: [app/views/upload] file: uploadfile.rhtml <h1>File Upload</h1> <% form_tag :action => 'uploadFile',                         :multipart => true do %> <p><label for="upload_file">Select File</label> :

<%= file_field 'upload', 'datafile' %></p>

<%= submit_tag "Upload" %> <% end %>

### run application http://upload.datajazz.com/upload/index

### Error Output NoMethodError in UploadController#uploadFile

You have a nil object when you didn't expect it! You might have expected an instance of ActiveRecord::Base. The error occurred while evaluating nil. RAILS_ROOT: ~/rails/upload

Application Trace | Framework Trace | Full Trace app/models/data_file.rb:3:in `save' app/controllers/upload_controller.rb:7:in `uploadFile'

Request Parameters:

{"multipart"=>"true", "commit"=>"Upload", "authenticity_token"=>"82b3eeae67198fb71bb4dea43b1790ac70bda0ae"} Show session dump

Response

Headers:

{"cookie"=>, "Content-Type"=>"", "Cache-Control"=>"no-cache"}

2

Hi All,

As I suspected, it was a very simple mistake in the original code which I had picked up from the web. Issue: the destination path didn't contain a valid directory. I suspect the original code probably worked on a different platform (probably Windows).

Here is the complete working solution, which I have rewritten to eliminate some of the older rails code.

Regards ************ Working solution ### dir: [app/models] file: data_file.rb class DataFile < ActiveRecord::Base   def self.save(upload)     # Changed Default Destination: [__RAILS_DIR__/public/data]     name = "data/" + upload.original_filename     File.open(name, "wb") { |f| f.write(upload.read) }   end end

### dir: [app/controllers] file: upload_controller.rb class UploadController < ApplicationController   def index      render :file => 'upload/uploadfile.rhtml'   end

  def uploadFile     file_param = params[:upload][:datafile]     post = DataFile.save(file_param)     render :text => "File has been uploaded successfully"   end end

### dir: [app/views/upload] file: uploadfile.rhtml <h1>File Upload</h1> <% form_for :upload,:url=>{:action => 'uploadFile'},:html => { :multipart => true } do |f| %>

<p><label for="upload_file">Select File</label> : <%= f.file_field 'datafile' %></p> <%= f.submit "Upload" %> <% end %>

### run application http://upload.datajazz.com/upload/index