How to get full file path?

[radovan...@gmail.com]

Hello,

i migrating from Carrierwave to Shrine as lightweighting from heavy tight on Rails.

I have central media storage, every file (image, document, video, audio) is stored in one place (model, db, and file system) and then file is associated to another objects.

I don't find any way how to get full file path. 

Carrierwave by calling

file.path

returns full path as

/Users/Rado/Development/my_app/public/uploads/asset/filename.jpg

but in Shrine it returns only partial path with calling "url" method, because path is not implemented

/asset/filename.jpg

i could append another partial from storage, but can't get full path.

is there any way how to find full path?

my config and files looks like this:

require 'shrine'
require 'shrine/storage/file_system'
require 'media_info'


Shrine.storages = {
  cache: Shrine::Storage::FileSystem.new('public', prefix: 'uploads/cache'),
  store: Shrine::Storage::FileSystem.new('public', prefix: 'uploads/asset')
}


Shrine.plugin :activerecord
Shrine.plugin :cached_attachment_data # for forms


class FileUploader < Shrine
  plugin :keep_files
  plugin :pretty_location
  plugin :determine_mime_type,
         analyzer: ->(io, analyzers) do
           MediaInfo.parse(io.path)&.general&.internet_media_type
         end


  def generate_location(io, context)
    if context[:record]
      id = context[:record].id if context[:record].respond_to?(:id)
    end


    basename = File.basename(context.fetch(:action) == :cache ? super : context.metadata.fetch('filename'))
    basename = "#{context[:version]}-#{basename}" if context[:version]


    ['asset', id, basename].compact.join('/')
  end
end

[Janko Marohnić]

The concept of a "full path" is specific to the filesystem storage, that's why Shrine::UploadedFile doesn't implement a #path method. If you look at the Shrine::Storage::FileSystem docs, you'll see that the storage object provides a #path method. So if you have a Shrine::UploadedFile object, you can retrieve its full path by passing in the #id to FileSystem#path:

  uploaded_file.storage.path(uploaded_file.id)

As a reminder, a Shrine::UploadedFile object is what is returned by model's attachment method, so if you have a Photo model with an "image" attachment, this would be how you would retrieve the full path to the :original version:

  photo.image[:original].storage.path(photo.image[:original].id)

Kind regards,

Janko

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[radovan...@gmail.com]

Thanks for hint. 

If i understand right for File storage Shrine doesn't inherit from Rubys File class, but implements own right?

Then when i want to get full path to file i need to use something like this in model class:

def original_path
  Rails.root.join(file.storage.path(file.id))
end

Thanks for hint me!

Regards,

Radovan

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[Janko Marohnić]

If i understand right for File storage Shrine doesn't inherit from Rubys File class, but implements own right?

Yes, the CarrierWave uploader doesn't inherit from `File` class either, it just implements #path explicitly. It wouldn't make sense to inherit from `File` class, because neither CarrierWave uploader nor Shrine::UploadedFile represent a file on the filesystem (at least not generally).

Then when i want to get full path to file i need to use something like this in model class:

 

def original_path
  Rails.root.join(file.storage.path(file.id))
end

Yes, that's correct. My bad, I forgot the Rails.root.join part. Alternatively you can use Rails.root.join to construct the directory name on Shrine::Storage::FileSystem initialization:

  Shrine.storages = {

    cache: Shrine::Storage::FileSystem.new(Rails.root.join('public'), prefix: 'uploads/cache'),

    store: Shrine::Storage::FileSystem.new(Rails.root.join('public'), prefix: 'uploads/asset')

  }

Then you can omit it in the model:

  def original_path

    file.storage.path(file.id)

  end

Note that this won't be necessary as of Shrine 2.8.0, as the filesystem storage will automatically expand the directory path on initialization.

Kind regards,

Janko

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[radovan...@gmail.com]

It works like a charm. Thank you.

You said Shrine 2.8.0 creates expand file path to full-path.

Does it means this will be breaking change for path in id attribute?

[Janko Marohnić]

Does it means this will be breaking change for path in id attribute?

No, the Shrine::UploadedFile#id will remain unchanged, the path expanding will only affect the FileSystem storage itself. To be specific, the only change is that now the Shrine::Storage::FileSystem#path and Shrine::Storage::FileSystem#directory methods will return the full path, even when the given directory path was relative.

Kind regards,

Janko

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[radovan...@gmail.com]

Good news :) Thank for response.

Have a nice day!