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I want to show a preview of presentation files on my website. I am trying to make a tempfile which reads from a Microsoft PowerPoint Open XML (.pptx) file stored in active storage.

I am using Docsplit.extract_images on the tempfile to convert the slides to images to show it as a preview in some form of image carousel.

I have slide parameterss such as [:name, :ppt, pages: [] ] where ppt is has_one_attached and pages is has_many_attached. This is what my slides_controller look like:

def create
    @slide = Slide.new(slide_params)

    respond_to do |format|
      if @slide.save
        tempfile = Tempfile.new([ 'foobar', '.pptx'])
        tempfile.binmode

        begin
          @slide.ppt.download { |chunk| tempfile.write(chunk) }
          tempfile.flush
          tempfile.rewind
        ensure
          tempfile.close!
        end
        @slide.pages << Docsplit.extract_images("#{tempfile.path}", :size => '1080x', :format => [:png])
        tempfile.unlink

        format.html { redirect_to slide_url(@slide), notice: "Slide was successfully created." }
        format.json { render :show, status: :created, location: @slide }
      else
        format.html { render :new, status: :unprocessable_entity }
        format.json { render json: @slide.errors, status: :unprocessable_entity }
      end
    end
  end

I am getting a Errno::ENOENT no such file or directory @ rb_sysopen error.

Is this the correct way to get the tempfile path?

Also, If I use tempfile.path instead of "#{tempfile.path}", I get a nil to string error.

42_Anuj Mohatkar
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  • Welcome to SO! You did a pretty good job asking your question, but I'd recommend removing the final question and asking it separately. It's not closely related to the main question and could cause downvotes or close votes because of forcing the question to be too broad. Also, please flesh out your code so it's runnable; See [mre]. – the Tin Man Mar 04 '22 at 21:29

1 Answers1

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In your ensure you are using tempfile.close! this unlinks the file per https://ruby-doc.org/stdlib-2.5.3/libdoc/tempfile/rdoc/Tempfile.html#method-i-close-21

If you just use close without the bang (!) then you should be all set!

sgbett
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