Delete file when record destroy

[Josue A. de Lima]

Hi, I have this models:

Photo: (Im using this to store photos of multiple models)

class Photo < ApplicationRecord

 include FileUploader[:file]

 belongs_to :imageable, polymorphic: true

end

require 'image_processing/mini_magick'

# File Uploader Class

class FileUploader < Shrine

plugin :derivation_endpoint,

secret_key: ENV['SECRET_KEY'],

prefix: 'derivations/thumbnails',

upload: true,

upload_redirect: true

plugin :infer_extension, force: true

derivation :thumbnail do |file, width, height|

ImageProcessing::MiniMagick

.source(file)

.resize_to_limit!(width.to_i, height.to_i)

end

end

class Variant < ApplicationRecord

belongs_to :item

has_many :options, dependent: :destroy

has_many :photos, as: :imageable, dependent: :destroy

end

When I run in Rails Console Variant.destroy_all, all the records destroy but the files don't get deleted.

¿How can I fire the delete? 

Thanks

[Janko Marohnić]

Shrine isn't automatically deleting dynamic derivatives, because it doesn't know where they were uploaded, since the destination storage is configurable.

You'll need to delete them manually after the record is deleted, for example:

  [[800, 800], [500, 500], [300, 300], ...].each do |(width, height)|

    photo.file.derivation(:thumbnail, width, height).delete

  end

You can also send that to a background job, for example:

  DeleteDynamicDerivatives.perform_async(

    photo.file.shrine_class,

    photo.file.to_json,

    [[:thumbnail, 800, 800], [:thumbnail, 500, 500], [:thumbnail, 300, 300], ...],

  )

  class DeleteDynamicDerivatives

    include Sidekiq::Worker

    def perform(shrine_class, file_data, derivations)

      shrine_class = Object.const_get(shrine_class)

      file         = shrine_class.uploaded_file(file_data)

      derivations.each do |args|

        file.derivation(*args).delete

      end

    end

  end

I would like to make it automatic at some point, but at the moment I don't know how.

Kind regards,
Janko

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[Josue A. de Lima]

Thanks for the response!, hope you can achieve the auto-delete at some point.

Regards

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[Janko Marohnić]

Yes, that's the default storage, but the user can override it with the :upload_storage plugin option (in the Plugin Options section).

Another problem is that a Shrine storage currently doesn't have the ability to delete all files under a given prefix (like ActiveStorage's #delete_prefixed), nor is it able to list files under a given prefix. Both of these features were requested recently, so they will likely get added some time after Shrine 3.0 is released. That should hopefully make it easier to implement auto-delete.

Kind regards,
Janko

On 9 Aug 2019, 09:59 +0200, Josue A. de Lima <josuea...@gmail.com>, wrote:

I don't understand what you mean by: "since the destination storage is configurable" you have the prefix and all thumbnails have this filename: filenameSTR/thumbnail-w-h (for thumbnails) and the main file: filenameSTR. I'm I right here? 

If Im right you just need to search all files and folders that start with filename, and delete them, right?

Or Im missing something?

On Friday, August 9, 2019 at 2:37:03 AM UTC-5, Janko Marohnić wrote:

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