ActiveShrine

ActiveShrine integrates Shrine file attachments with Active Record models using a familiar API inspired by Active Storage. It provides a simple, flexible way to manage file uploads in your Rails applications while leveraging Shrine's powerful features.

Features

• Active Storage-like API: Familiar has_one_attached and has_many_attached interface
• Customizable Uploaders: Use custom Shrine uploaders with validation, processing, and more
• Polymorphic Associations: Attachments are stored using polymorphic associations
• Eager Loading Support: Prevent N+1 queries with with_attached_* scopes

Installation

Add ActiveShrine to your application's Gemfile:

gem "active_shrine"

Then execute:

$ bundle install

Generate and run the migration:

$ rails generate active_shrine:install
$ rails db:migrate

Basic Usage

Include ActiveShrine::Model in your models and declare attachments:

class User < ApplicationRecord
  include ActiveShrine::Model

  has_one_attached :avatar
  has_many_attached :photos
end

Work with attachments using a familiar API:

# Attach a file
user.avatar = File.open("avatar.jpg")
user.save

# Access the attachment
user.avatar.url
user.avatar.content_type
user.avatar.filename

# Remove the attachment
user.avatar = nil
user.save

Eager Loading

Prevent N+1 queries by eager loading attachments:

# Single attachment
User.with_attached_avatar

# Multiple attachments
User.with_attached_photos

Custom Uploaders

Define custom uploaders with Shrine features and validations:

class ImageUploader < Shrine
  plugin :validation_helpers
  plugin :derivatives

  Attacher.validate do
    validate_max_size 10 * 1024 * 1024
    validate_mime_type %w[image/jpeg image/png image/webp]
  end
  
  Attacher.derivatives do |original|
    {
      small: shrine_derivative(:resize_to_limit, 300, 300),
      medium: shrine_derivative(:resize_to_limit, 500, 500)
    }
  end
end

Use custom uploaders in your models:

class User < ApplicationRecord
  include ActiveShrine::Model

  has_one_attached :avatar, uploader: ::ImageUploader
end

Development

After checking out the repo:

1. Run bin/setup to install dependencies
2. Run bundle exec rake test to run the tests
3. Run bin/console for an interactive prompt

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

Bug reports and pull requests are welcome on GitHub at https://github.com/radioactive-labs/active_shrine.

License

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

Code of Conduct

Everyone interacting in the ActiveShrine project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.