1
0
Fork 0
mirror of https://github.com/rails/rails.git synced 2022-11-09 12:12:34 -05:00
rails--rails/activestorage
Dwight Watson 8e8f09fa18 Flip the order of the after_create callbacks
Addresses rails/rails#32247

Add test that checks identify and analyze work in correct order

Break out direct upload test helper

Review changes for direct-upload test helper
2018-03-27 12:58:19 +11:00
..
app Flip the order of the after_create callbacks 2018-03-27 12:58:19 +11:00
bin Add executable file activestorage/bin/test 2017-08-20 21:28:56 +03:00
config Merge Previews/Variants controller into one Representations controller. 2018-03-03 21:36:43 +01:00
db/migrate Widen blob size column 2017-08-24 09:37:04 -04:00
lib Allow full use of the AWS S3 SDK authentication options (#32270) 2018-03-19 15:25:40 +00:00
test Flip the order of the after_create callbacks 2018-03-27 12:58:19 +11:00
.babelrc Add 'activestorage/' from commit '3f4a7218a4a4923a0e7ce1b2eb0d2888ce30da58' 2017-07-31 15:21:22 -04:00
.eslintrc Add 'activestorage/' from commit '3f4a7218a4a4923a0e7ce1b2eb0d2888ce30da58' 2017-07-31 15:21:22 -04:00
.gitignore Clean up and consolidate .gitignores 2018-02-17 14:26:19 -08:00
activestorage.gemspec Generate root-relative paths in Active Storage disk service URL methods 2018-03-05 11:54:43 -05:00
CHANGELOG.md Remove backported CHANGELOG entry [ci skip] 2018-03-19 15:30:23 +00:00
MIT-LICENSE Bump license years for 2018 2017-12-31 22:36:55 +09:00
package.json Include source code in published activestorage npm package 2018-02-06 08:18:21 -08:00
Rakefile Fixed broken bundle exec rake install 2017-09-26 17:56:38 +09:00
README.md Add cloud service's links to README of Active Storage [ci skip] 2017-12-22 06:40:24 +09:00
webpack.config.js webpack is assigned but never used in webpack.config.js 2017-12-11 00:01:16 +09:00
yarn.lock Update yarn lock 2017-11-27 12:55:20 -05:00

Active Storage

Active Storage makes it simple to upload and reference files in cloud services like Amazon S3, Google Cloud Storage, or Microsoft Azure Storage, and attach those files to Active Records. Supports having one main service and mirrors in other services for redundancy. It also provides a disk service for testing or local deployments, but the focus is on cloud storage.

Files can be uploaded from the server to the cloud or directly from the client to the cloud.

Image files can furthermore be transformed using on-demand variants for quality, aspect ratio, size, or any other MiniMagick supported transformation.

Compared to other storage solutions

A key difference to how Active Storage works compared to other attachment solutions in Rails is through the use of built-in Blob and Attachment models (backed by Active Record). This means existing application models do not need to be modified with additional columns to associate with files. Active Storage uses polymorphic associations via the Attachment join model, which then connects to the actual Blob.

Blob models store attachment metadata (filename, content-type, etc.), and their identifier key in the storage service. Blob models do not store the actual binary data. They are intended to be immutable in spirit. One file, one blob. You can associate the same blob with multiple application models as well. And if you want to do transformations of a given Blob, the idea is that you'll simply create a new one, rather than attempt to mutate the existing one (though of course you can delete the previous version later if you don't need it).

Installation

Run rails active_storage:install to copy over active_storage migrations.

Examples

One attachment:

class User < ApplicationRecord
  # Associates an attachment and a blob. When the user is destroyed they are
  # purged by default (models destroyed, and resource files deleted).
  has_one_attached :avatar
end

# Attach an avatar to the user.
user.avatar.attach(io: File.open("/path/to/face.jpg"), filename: "face.jpg", content_type: "image/jpg")

# Does the user have an avatar?
user.avatar.attached? # => true

# Synchronously destroy the avatar and actual resource files.
user.avatar.purge

# Destroy the associated models and actual resource files async, via Active Job.
user.avatar.purge_later

# Does the user have an avatar?
user.avatar.attached? # => false

# Generate a permanent URL for the blob that points to the application.
# Upon access, a redirect to the actual service endpoint is returned.
# This indirection decouples the public URL from the actual one, and
# allows for example mirroring attachments in different services for
# high-availability. The redirection has an HTTP expiration of 5 min.
url_for(user.avatar)

class AvatarsController < ApplicationController
  def update
    # params[:avatar] contains a ActionDispatch::Http::UploadedFile object
    Current.user.avatar.attach(params.require(:avatar))
    redirect_to Current.user
  end
end

Many attachments:

class Message < ApplicationRecord
  has_many_attached :images
end
<%= form_with model: @message, local: true do |form| %>
  <%= form.text_field :title, placeholder: "Title" %><br>
  <%= form.text_area :content %><br><br>

  <%= form.file_field :images, multiple: true %><br>
  <%= form.submit %>
<% end %>
class MessagesController < ApplicationController
  def index
    # Use the built-in with_attached_images scope to avoid N+1
    @messages = Message.all.with_attached_images
  end

  def create
    message = Message.create! params.require(:message).permit(:title, :content)
    message.images.attach(params[:message][:images])
    redirect_to message
  end

  def show
    @message = Message.find(params[:id])
  end
end

Variation of image attachment:

<%# Hitting the variant URL will lazy transform the original blob and then redirect to its new service location %>
<%= image_tag user.avatar.variant(resize: "100x100") %>

Direct uploads

Active Storage, with its included JavaScript library, supports uploading directly from the client to the cloud.

Direct upload installation

  1. Include activestorage.js in your application's JavaScript bundle.

    Using the asset pipeline:

    //= require activestorage
    

    Using the npm package:

    import * as ActiveStorage from "activestorage"
    ActiveStorage.start()
    
  2. Annotate file inputs with the direct upload URL.

    <%= form.file_field :attachments, multiple: true, direct_upload: true %>
    
  3. That's it! Uploads begin upon form submission.

Direct upload JavaScript events

Event name Event target Event data (event.detail) Description
direct-uploads:start <form> None A form containing files for direct upload fields was submitted.
direct-upload:initialize <input> {id, file} Dispatched for every file after form submission.
direct-upload:start <input> {id, file} A direct upload is starting.
direct-upload:before-blob-request <input> {id, file, xhr} Before making a request to your application for direct upload metadata.
direct-upload:before-storage-request <input> {id, file, xhr} Before making a request to store a file.
direct-upload:progress <input> {id, file, progress} As requests to store files progress.
direct-upload:error <input> {id, file, error} An error occurred. An alert will display unless this event is canceled.
direct-upload:end <input> {id, file} A direct upload has ended.
direct-uploads:end <form> None All direct uploads have ended.

License

Active Storage is released under the MIT License.

Support

API documentation is at:

Bug reports for the Ruby on Rails project can be filed here:

Feature requests should be discussed on the rails-core mailing list here: