[BUG] Attachment to `ask` are not saved to disk during a transaction (rails integration)

[mkamensky]

Basic checks

• I searched existing issues - this hasn't been reported
• I can reproduce this consistently
• This is a RubyLLM bug, not my application code

What's broken?

I am trying to use chat.ask, with chat a rails model, inside a transaction, where the arguments to ask include an attachment. I end up with an ActiveStorage::FileNotFoundError coming from

ruby_llm/lib/ruby_llm/active_record/message_methods.rb

Line 110 in ac4d5d7

tempfile = download_attachment(attachment)

The reason appears to be that ActiveStorage does not save the attachment until after the transaction is over, which happens after the above mentioned loading takes place. This is similar to rails/rails#41661 and rails/rails#43663.

How to reproduce

1. Configure RubyLLM with Rails integration
2. Create a Chat model and run ask with an attachment within a transaction
3. Experience ActiveStorage::FileNotFoundError

Expected behavior

Proceed with the query as outside a transaction

What actually happened

Receive an exception

Environment

• Ruby version: 4.0.2
• RubyLLM version: 1.14.1