scene=3 is not a valid IO object (it doesn't respond to #eof?, #rewind, #close)

[shoga...@gmail.com]

Upload pdf and convert all pages to images one by one and store against one db record.


Here is code.

require 'RMagick'

class PdfUploader < Shrine

  include ImageProcessing::MiniMagick

  plugin :activerecord

  plugin :determine_mime_type

  plugin :logging, logger: Rails.logger

  plugin :remove_attachment

  plugin :store_dimensions

  plugin :validation_helpers

  plugin :versions, names: [:original,:pngs]

  plugin :add_metadata

  plugin :processing

  add_metadata :pages do |io, context|

    PDF::Reader.new(io.path).page_count

  end

  

  Attacher.validate do

    validate_max_size 50.megabytes, message: 'is too large (max is 2 MB)'

    validate_mime_type_inclusion ['application/pdf']

  end

 def process(io, context)

    case context[:phase]

      when :store

        pngs = if io.mime_type == 'application/pdf'

          tempPdf = io.download

          pdf = Magick::ImageList.new(tempPdf.path)

          pdf.each_with_index do |page_img, i|              

            path = Rails.root.join('tmp',"#{i}_pdf_page.png").to_s

            image = page_img.write path 

          end

        end

        # raise pngs

        { original: io,pngs: pngs}

    end

  end

end

Please help me whats wrong?
Thanks

[Janko Marohnić]

This means that a file you passed to Shrine (one of the version objects) is not a valid IO object. It looks like you passed an array RMagick objects.

The simplest way is to just `File.open(path_to_file)`, and pass that opened File object as a version. You can probably just call #path on the RMagick object to get thr path.

Kind regards,
Janko

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[shoga...@gmail.com]

Thanks for you valuable reply.

Actually i wan to store multiple images in a single record in json form and keep original PDF document as well.here is versioning [:original,:pngs]

and process method.

 def process(io, context)

    case context[:phase]

      when :store

        pngs = if io.mime_type == 'application/pdf'

 

 pngs = []

images_array = ['1.jpg','2.jpg','3.jpg']

image_path_is =  Rails.root.join('lib','tasks',images_array.sample).to_s

pngs1  = File.open(image_path_is)

image_path_is =  Rails.root.join('lib','tasks',images_array.sample).to_s

pngs2  = File.open(image_path_is)

pngs.push(pngs1)

pngs.push(pngs2)

        end

          { original: io,pngs: pngs}

    end

  end

my question is how to pass converted images to shrine to update json data properly?

Thanks

[shoga...@gmail.com]

Hi friends,
Please help me on above post i have read so many posts over the internet and read documentation but could not grasp the idea .
May be i am new to ruby and rails environment that is why some things are not understandable to me.
Warmly Thanks.

[shoga...@gmail.com]

Hi,
Can any one answer in this group?
Thanks

[Janko Marohnić]

Sorry, I've been traveling a lot lately, and haven't managed to find time to answer.

Shrine currently doesn't support storing an array of files, though that support might get added in the future. At the moment you could just create version for each png in collection, and add the index number to the name:

  versions = {original: original}

  pngs.each_with_index do |png, idx|

    versions[:"png_#{idx}"] = png

  end

  versions

That way you end up with the following versions:

  :original

  :png_0

  :png_1

  :png_2

  ...

Kind regards,

Janko

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[shoga...@gmail.com]

Hi Janko

Thanks for answering.I know  you are be busy but i was expecting from other group fellows.

Now this problem was resolved with new error.

I think its coming from version plugin.

Here is quick video 
https://www.dropbox.com/s/55j690y1z8brun5/1.mkv?dl=0

here is code
https://www.dropbox.com/s/n7x21onosqybowa/shrine-pratice.zip?dl=0

Hope you never mind to help :) 

Thanks  Janko

Janko

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[Janko Marohnić]

The problem is that you've created nested versions:

{

  original: ...,

  pngs: {

    png_0: ...,

    png_1: ...,

    png_2: ...,

    ...

  }

}

Shrine doesn't support that (at least not at the moment), you need to assign all versions on the same level of the hash:

{

  original: ...,

  png_0: ...,

  png_1: ...,

  png_2: ...,

  ...

}

Kind regards,

Janko

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[shoga...@gmail.com]

Hi janko

Thanks alot bro - fixed - you are great.

Thanks
Zeeshan