From: Brian Candler <b.candler@...>
Date: 2009-08-10T17:51:48+09:00
Subject: Re: How do I upload an image with Sinatra (like Paperclip)?

Tony Tony wrote:
> I need to upload an image from my local computer to a web server and
> store the location in a database (similar to how Paperclip and
> attachment_fu work) in Sinatra.

I don't know Paperclip or attachment_fu, but getting the attachment in 
Sinatra is easy: you get an open tempfile that you read from.

Something like this (extracted from some working code but not tested in 
isolation):

  post '/upload' do
    unless params[:file] &&
           (tmpfile = params[:file][:tempfile]) &&
           (name = params[:file][:filename])
      @error = "No file selected"
      return haml(:upload)
    end
    STDERR.puts "Uploading file, original name #{name.inspect}"
    while blk = tmpfile.read(65536)
      # here you would write it to its final location
      STDERR.puts blk.inspect
    end
    "Upload complete"
  end

---------
  %h1 Upload

  %form{:action=>"/upload",:method=>"post",:enctype=>"multipart/form-data"}
    %input{:type=>"file",:name=>"file"}
    %input{:type=>"submit",:value=>"Upload"}
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