upload file to save

rubyonrails-talk
1

I am new to rails and am stuck on the above. I have used a mixture of code from the agile web dev with rails book and what I have found with google. I realise there are easier ways to do this with various plugins but I would be interested to know why my code does not work. The code runs and a file is created in the expected place but this file is zero length so something is wrong. Model code class Photo < ActiveRecord::Base

  belongs_to :user

  validates_format_of :content_type,                       :with => /^image/,                       :message => "--- you can only upload pictures"

  def uploaded_picture=(picture_field)     self.photofile = base_part_of (picture_field.original_filename)     self.content_type = picture_field.content_type.chomp     self.is_visible = 0     @data = picture_field.read   end etc etc

Controller code   def create       @photo = Photo.new(params[:photo])       filename = @photo.photofile       directory = "public/images"     # create the file path       user= User.find(session[:userid])       path = File.join(directory, user.user_id)       if File.exist?(path) == false            Dir.mkdir(path)       end       path = File.join(directory, user.user_id, filename)     # write the file # File.new(path, "wb") { |f| f.write(params[:picture_field].read) }      File.new(path, "wb") { |f| f.write(@data) }

and the view <% form_for(:photo,             :url => {:action => 'create'},             :html => { :multipart => true }) do |f| %>

  <p>     <b>Caption</b><br />     <%= f.text_field :caption %>   </p>   Upload your picture: <%= f.file_field("uploaded_picture") %><br/>     <p>     <%= f.submit "Upload Photo" %>   </p> <% end %>

So there are obviously some basics here that I have not yet "got".

Many thanks for looking

2

it seems you're trying to write @data into that file. you didn't initialize that variable in your controller. the only occurrence is inside your model. but model and controller don't share variables (even if they have a similar name).

in such a case it is always helpful to debug your code. set a debugger and see which variables contain which values.

also: don't try to call methods (in your model) from your view. in general i'd advice to stick to MVC-pattern. you could put that uploaded_picture-code into your helper or just recode it.

3

for your view, if in doubt use this instead of <%= f.file_field ("uploaded_picture") %>   <input type="file" name="chosen_file" />

in your controller (the line you commented out):   File.new(path, "wb") { |f| f.write(params[:chosen_file].read) }

if i didn't miss anything, this should do the trick.

4

I tried this and got an error. My stuff was based on this website - Ruby on Rails - File Uploading. I wanted a photo stored in images/user-id/ whereas this only uses images/. So if I remove the user-id directory, and do this, I still get an empty file. Thanks for you replies - I need to think my rails usage.

5

well, you got a few errors here and there. for example:   path = File.join(directory, user.user_id, filename) i guess user doesn't have a user_id but an id, so try:   path = File.join(directory, user.id, filename)

if you post your error-message, we can try to get there step by step. but in general it would be best if you followed some tutorials for your first steps.