ruby-on-rails - 错误，Ruby on Rails: Encoding::UndefinedConversionError in CoursesController#attachment "\xFF"从 ASCII-8BIT 到 UTF-8

Question

我想在 Rails 3.2.8 上使用 tag_form 制作一个简单的文件上传器。
但是当我尝试提交图像文件时，我收到一条错误消息

错误消息(当我尝试提交图像文件时)

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

如果你能帮我解决这个问题，我将不胜感激。
这是我的代码。

应用程序/ View /show.html.erb

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

应用程序/ 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

Answer 1

尝试以二进制模式打开文件( 'wb' 而不是 'w' ):

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

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