rails--rails/activestorage/CHANGELOG.md

• ActiveStorage::PreviewError is raised when a previewer is unable to generate a preview image.

  Alex Robbin

• Add ActiveStorage::Streaming module that can be included in a controller to get access to #send_blob_stream, which wraps the new ActionController::Base#send_stream method to stream a blob from cloud storage:

  class MyPublicBlobsController < ApplicationController
    include ActiveStorage::SetBlob, ActiveStorage::Streaming
  
    def show
      http_cache_forever(public: true) do
        send_blob_stream @blob, disposition: params[:disposition]
      end
    end
  end
  

  DHH

• Add ability to use pre-defined variants.

  class User < ActiveRecord::Base
    has_one_attached :avatar do |attachable|
      attachable.variant :thumb, resize: "100x100"
      attachable.variant :medium, resize: "300x300", monochrome: true
    end
  end
  
  class Gallery < ActiveRecord::Base
    has_many_attached :photos do |attachable|
      attachable.variant :thumb, resize: "100x100"
      attachable.variant :medium, resize: "300x300", monochrome: true
    end
  end
  
  <%= image_tag user.avatar.variant(:thumb) %>
  

  fatkodima

• After setting config.active_storage.resolve_model_to_route = :rails_storage_proxy rails_blob_path and rails_representation_path will generate proxy URLs by default.

  Ali Ismayilov

• Declare ActiveStorage::FixtureSet and ActiveStorage::FixtureSet.blob to improve fixture integration

  Sean Doyle

Please check 6-1-stable for previous changes.