I thought I remembered the first version of TransactionWrite being released in 3.10 but I don't see it there. It's in main so you can put this in your gemfile:
gem 'dynamoid', git: 'https://github.com/Dynamoid/dynamoid.git'

This branch has some more documentation about some hidden features but won't be live until the non-transaction actions catch up:
gem 'dynamoid', git: 'https://github.com/ckhsponge/dynamoid.git', branch: 'transact-update'

@andrykonchin Want to release transactions some time?

gem 'dynamoid', git: 'https://github.com/Dynamoid/dynamoid.git' -> works for me
Thanksssss <3

@ckhsponge Let me ask, if I want to delete_all with Dynamoid::TransactionWrite, is there any way?

No. I believe in DynamoDB deletions can only occur individually, in a batch or in a transaction and always require primary keys. Dynamoid's delete_all probably gets keys and deletes in batches and this wouldn't be possible in a transaction.

@ckhsponge Yeah, the next version with transactions support should be released soon. I have some ideas how to polish new tests and wanted to close some minor issues.

@andrykonchin Is there any plan for when the next release will take shape?

Happy Friday!

Yeah, I am going to spent some time soon to polish recent changes and prepare the release.