错误,Ruby on Rails:在CoursesController编码:: UndefinedConversionError#attachment"\ xFF"从ASCII-8BIT到UTF-8

Question

我想在Rails 3.2.8上使用tag_form创建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

错误消息(当我尝试提交图像文件时)

在CoursesController#attachment
"\ xFF"中编码:: UndefinedConversionError 从ASCII-8BIT到UTF-8

如果你帮我解决这个问题我会很感激的.
这是我的代码.

应用程序/视图/ 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/控制器/ 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

配置/ routes.rb中

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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