在Rails 3中处理文件上传

Question

I had a working code for Rails 2 to handle file uploads that no longer works with Rails 3. The code is:

# Handling file uploads
def file=(file_data)
  unless file_data.blank?
    @file_data = file_data
    self.filename = file_data.original_filename
    self.size_before = file_data.size
  end
end

Now Rails 3 doesn't like that, complains with:

undefined method `original_filename' for "MyFile.Ext":String

Any solutions that doesn't involve using a file attachment handler (Paperclip, etc)?

Answer 1

问题在于表单不是多部分表单。

Answer 2

Obviously, 'file_data' is a different type than in your old environment. Here it's a String (which doesn't respond to 'original_filename'), but in your Rails 2 app it could have been StringIO.

Try figuring how rails 3 handles binary data when posting a form by looking in your logs for params and/or debugging and investigating input in your receiving controller action.

Provide more context for more precise answers ;-)