rails--rails/activestorage/CHANGELOG.md

• Method attach always returns the attachments except when the record is persisted, unchanged, and saving it fails, in which case it returns nil.

  Santiago Bartesaghi

• Fixes multiple attach calls within transaction not uploading files correctly.

  In the following example, the code failed to upload all but the last file to the configured service.

    ActiveRecord::Base.transaction do
      user.attachments.attach({
        content_type: "text/plain",
        filename: "dummy.txt",
        io: ::StringIO.new("dummy"),
      })
      user.attachments.attach({
        content_type: "text/plain",
        filename: "dummy2.txt",
        io: ::StringIO.new("dummy2"),
      })
    end
  
    assert_equal 2, user.attachments.count
    assert user.attachments.first.service.exist?(user.attachments.first.key)  # Fails
  

  This was addressed by keeping track of the subchanges pending upload, and uploading them once the transaction is committed.

  Fixes #41661

  Santiago Bartesaghi, Bruno Vezoli, Juan Roig, Abhay Nikam

• Raise an exception if config.active_storage.service is not set.

  If Active Storage is configured and config.active_storage.service is not set in the respective environment's configuration file, then an exception is raised with a meaningful message when attempting to use Active Storage.

  Ghouse Mohamed

• Fixes proxy downloads of files over 5mb

  Previously, trying to view and/or download files larger than 5mb stored in services like S3 via proxy mode could return corrupted files at around 5.2mb or cause random halts in the download. Now, ActiveStorage::Blobs::ProxyController correctly handles streaming these larger files from the service to the client without any issues.

  Fixes #44679

  Felipe Raul

• Saving attachment(s) to a record returns the blob/blobs object

  Previously, saving attachments did not return the blob/blobs that were attached. Now, saving attachments to a record with #attach method returns the blob or array of blobs that were attached to the record. If it fails to save the attachment(s), then it returns false.

  Ghouse Mohamed

• Don't stream responses in redirect mode

  Previously, both redirect mode and proxy mode streamed their responses which caused a new thread to be created, and could end up leaking connections in the connection pool. But since redirect mode doesn't actually send any data, it doesn't need to be streamed.

  Luke Lau

Please check 7-0-stable for previous changes.