File Upload By form_tag form on Ruby on Rails

2
votes

I'd like to make a simple file uploader using tag_form on Rails 3.2.8.
But when I try to submit a image file, I get an error saying

Error Message (when I try to submit a image file)

NoMethodError in CoursesController#attachment
undefined method `original_filename' for "2012-03-02 21.53.55.jpg":String

----- BEGIN P.S.(20121216 19:32) -----
or Error Message (when I added ":multipart => true" on show.html.erb)

Encoding::UndefinedConversionError in CoursesController#attachment
"\xFF" from ASCII-8BIT to UTF-8

----- END P.S. -----

It seems that the program consider the file as String?
There might be some problem in the view file.

I'd appreciate it if you help me with this problem. Here's my codes.


app/view/show.html.erb

<%= form_tag(attachment_course_path, :action=>'attachment') do %>
<div class="field">
  <%= label_tag :file %>
  <%= file_field_tag :file %>
</div>
<div class="actions">
  <%= submit_tag 'Submit' %>
</div>
<% end %>


app/controller/courses_controller.rb

def attachment
  t = Time.now.strftime("%Y%m%d%H%M%S")
  uploaded_io = params[:file]
  File.open(Rails.root.join('public', 'upload', uploaded_io.original_filename), 'w') do |file|
    file.write(uploaded_io.read)
  end
end


config/routes.rb

resources :courses, :only => [ :show ] do
  member do
    post :attachment
  end
end
2
ruby-on-railsformstagsruby-on-rails-3.2

2 Answers

3
votes

seems the form is not sending files with request. you need to set :multipart => true in form_tag.

0
votes

The problem seems similar to RoR upload Undefined encoding conversion

After setting :multipart => true in form_tag you need to open the file in binary mode ('wb' instead of 'w'):

app/controller/courses_controller.rb

...
File.open(Rails.root.join('public', 'upload', uploaded_io.original_filename), 'wb') do |file|
  file.write(uploaded_io.read)
end
...