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Description

Shrine implements a plugin system analogous to Roda’s and Sequel’s. It has a small core which provides only the essential functionality, while other features come as plugins which can be loaded when needed. Shrine ships with over 25 plugins, which together provide a great arsenal of features.

This design makes Shrine extremely versatile. File uploads are very delicate, and need to be handled differently depending on what types of files are being uploaded, whether there is processing or not, what storage is used etc. Instead of having an opinion on how you want to do your upload, Shrine allows you to build an uploading flow that suits your needs.

Code Quality Rank: L5
Monthly Downloads: 88,209
Programming language: Ruby
License: MIT License
Tags: File Upload     Toolkit     Refile    
Latest version: v3.2.1

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README

Shrine

Shrine is a toolkit for handling file attachments in Ruby applications. Some highlights:

If you're curious how it compares to other file attachment libraries, see the Advantages of Shrine. Otherwise, follow along with the Getting Started guide.

Resource URL
Website & Documentation shrinerb.com
Demo code Roda / Rails
Wiki github.com/shrinerb/shrine/wiki
Help & Discussion discourse.shrinerb.com

Setup

Add the gem to your Gemfile:

# Gemfile
gem "shrine", "~> 3.0"

Then add config/initializers/shrine.rb which sets up the storage and loads ORM integration:

require "shrine"
require "shrine/storage/file_system"

Shrine.storages = {
  cache: Shrine::Storage::FileSystem.new("public", prefix: "uploads/cache"), # temporary
  store: Shrine::Storage::FileSystem.new("public", prefix: "uploads"),       # permanent
}

Shrine.plugin :activerecord           # loads Active Record integration
Shrine.plugin :cached_attachment_data # enables retaining cached file across form redisplays
Shrine.plugin :restore_cached_data    # extracts metadata for assigned cached files

Next, add the <name>_data column to the table you want to attach files to. For an "image" attachment on a photos table this would be an image_data column:

$ rails generate migration add_image_data_to_photos image_data:text

Now create an uploader class (which you can put in app/uploaders) and register the attachment on your model:

class ImageUploader < Shrine
  # plugins and uploading logic
end
class Photo < ActiveRecord::Base
  include ImageUploader::Attachment(:image) # adds an `image` virtual attribute
end

In our views let's now add form fields for our attachment attribute that will allow users to upload files:

<%= form_for @photo do |f| %>
  <%= f.hidden_field :image, value: @photo.cached_image_data %>
  <%= f.file_field :image %>
  <%= f.submit %>
<% end %>

When the form is submitted, in your controller you can assign the file from request params to the attachment attribute on the model:

class PhotosController < ApplicationController
  def create
    Photo.create(photo_params) # attaches the uploaded file
    # ...
  end

  private

  def photo_params
    params.require(:photo).permit(:image)
  end
end

Once a file is uploaded and attached to the record, you can retrieve the file URL and display it on the page:

<%= image_tag @photo.image_url %>

See the Getting Started guide for further documentation.

Inspiration

Shrine was heavily inspired by Refile and Roda. From Refile it borrows the idea of "backends" (here named "storages"), attachment interface, and direct uploads. From Roda it borrows the implementation of an extensible plugin system.

Similar libraries

  • Paperclip
  • CarrierWave
  • Dragonfly
  • Refile
  • Active Storage

Contributing

Please refer to the contributing page.

Code of Conduct

Everyone interacting in the Shrine project’s codebases, issue trackers, and mailing lists is expected to follow the Shrine code of conduct.

License

The gem is available as open source under the terms of the MIT License.


*Note that all licence references and agreements mentioned in the Shrine README section above are relevant to that project's source code only.