Maybe try 
this? 
http://stackoverflow.com/questions/5163339/write-and-read-a-file-with-utf-8-encoding
Does it matter if every file is considered UTF-8 even if it never contains 
a UTF-8 character?

On Monday, July 14, 2014 5:01:11 AM UTC-6, Ruby-Forum.com User wrote:
>
> My Rails application (Rails 4.1, Ruby 2.1.1) offers the user to upload a 
> file. This file will then be parsed by the application, and after the 
> parsing is done, it is deleted from the upload area. 
>
> So far, I have the following: 
>
> In my upload form, I have 
>
>     <%= file_field_tag :upload, {accept: 'text/plain', class: 
> 'file_upload'} %> 
>
> In my controller, params[:upload] contains an object of class Tempfile, 
> which is already opened for reading. I am using #readline to read 
> through this file. 
>
> The problem now is that the file has encoding utf-8, and as soon as 
> reading contains a character which isn't also a 7-Bit ASCII character, I 
> get an exception. 
>
> What is the best way to read an uploaded UTF-8 file? 
>
> I was already thinking along the following line: The Tempfile class also 
> has a method #path, which returns the path of the uploaded file. I could 
> create a File object by opening this path, specify utf8 when opening it, 
> and read from this. 
>
> However, since this problem must occur quite frequently, I wonder 
> whether there is a way (maybe in the file_field_tag) to tell Rails that 
> the Tempfile object should be opened as utf8 for reading. Is this 
> possible, or is there another good way to deal with this problem? 
>
> -- 
> Posted via http://www.ruby-forum.com/. 
>

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