Rails - Using Tempfile to write on Heroku?

问题

I need to be able to write a temporary file for use during the request only.

Locally I can use the following successfully:

    tempfile = File.open(a.original_filename,'w')
    tempfile.write_nonblock(a.body)        
      paperclip stuff........
    tempfile.close 

That works great, but not on Heroku... How can I do the above with Heroku's restrictions: link text

I'm not understanding how to translate the above into: #{RAILS_ROOT}/tmp/myfile_#{Process.pid}

Thanks for any help you can provide here.

回答1:

I have a solution for you if you have to do stuff with paperclip. Include this class in your lib folder as heroku_compliant_file.rb

class HerokuCompliantFile < StringIO
  def initialize(str,filename,content_type)
    @original_filename = filename
    @content_type = content_type
    super(str)
  end
end

In your model containing the paperclip -

def insert_a_hunk_of_string_into_paperclip(some_object)
  f = HerokuCompliantFile.new(some_object.render,"myfile_#{Process.pid}","application/pdf")
  self.paperclip_model = f
  save
end

回答2:

Did you try tempfile = File.open("#{RAILS_ROOT}/tmp/myfile_#{Process.pid}",'w') ?

---

The correct syntax is tempfile = File.new("#{RAILS_ROOT}/tmp/myfile_#{Process.pid}",'w') (see comments)

来源：https://stackoverflow.com/questions/4356582/rails-using-tempfile-to-write-on-heroku