[Chat] Introduce `Chat::branch` and multi-session support #821

Guikingone · 2025-10-27T16:39:42Z

Q	A
Bug fix?	no
New feature?	yes
Docs?	yes
Issues	None
License	MIT

Hi 👋🏻

This PR aims to introduce a new method fork via a custom interface (for message store and a custom method for the chat), this method aim to allow to "switch" between chats / messages like discussed in #254 with @welcoMattic, the logic behind is pretty much the same but allows to "create a new branch" in a chat and rollback to the primary one if needed (the main inspiration is the capability from "current chats like OpenAI" to create new conversations while fetching old messages).

As the Chat depends on the MessageStore implementation, a new method is added to stores using a new interface.

OskarStark · 2025-12-18T18:55:18Z

open for finishing this PR?

Guikingone · 2025-12-18T19:56:17Z

Yes, need to rebase it and finish the work, shouldn't be too long 🙂

This PR was merged into the main branch. Discussion ---------- [Chat] Fix keys access for `Cloudflare` | Q | A | ------------- | --- | Bug fix? | yes | New feature? | no | Docs? | no | Issues | Detected via #821 | License | MIT After the `reset`, if the element has the key `12`, the final array will keep it as it, need to reindex the array before returning it 😓 Commits ------- 6450054 ref

OskarStark · 2026-01-06T21:46:13Z

All bridges need to require ^0.2 of symfony/ai-chat

Guikingone · 2026-01-09T18:26:40Z

Hi @OskarStark @chr-hertel 👋🏻

I'm opening this PR for reviews as the CI errors are irrelevant for the review of the PR, I prefer to discuss the implementation before fixing the tests / static analysis, it would be easier to lock an implementation then fix the CI than the other way around 😅

I'm letting you reviewing it when you have time 🙂

OskarStark · 2026-01-09T18:33:42Z

Wouldn't "clone" be more self explanatory? 🤔

Guikingone · 2026-01-09T18:37:38Z

Agree but it's close to __clone(), I was tempted to call it copy or fork, don't have a final opinion on the method name to be honest 😅

OskarStark · 2026-01-09T18:39:40Z

Branch() ?

Guikingone · 2026-01-09T18:41:23Z

Hum, interesting, sounds like a git branch, make sense 🤔

.github/workflows/tests.yaml

docs/components/chat.rst

Guikingone · 2026-01-13T09:43:39Z

Friendly ping @OskarStark, I'm facing a small issue when testing bridges, it looks like the composer install is linking symfony/ai-chat properly and using the latest version (0.2) but it looks like symfony/ai-platform is not linked properly (even when using 0.2):

Any idea? 🤔

This was referenced Nov 28, 2025

[Chat] Question about conversation history support in Symfony AI #1018

Closed

[Platform] Add ID to message bag #1027

Merged

Guikingone changed the title ~~[Chat] Support for chat "fork"~~ [Chat] Introduce Chat::fork Dec 3, 2025

Guikingone force-pushed the chat/fork branch 3 times, most recently from b7ae118 to 20a4270 Compare December 29, 2025 20:56

Guikingone mentioned this pull request Dec 31, 2025

[Chat] Fix keys access for Cloudflare #1331

Merged

Guikingone force-pushed the chat/fork branch from 1c9bea5 to b4240fa Compare December 31, 2025 15:59

Guikingone force-pushed the chat/fork branch from b4240fa to 443a05a Compare January 6, 2026 20:21

Guikingone changed the title ~~[Chat] Introduce Chat::fork~~ [Chat] Introduce Chat::fork and multi-session support Jan 6, 2026

Guikingone force-pushed the chat/fork branch 5 times, most recently from 5a955ba to 32e6968 Compare January 9, 2026 18:24

Guikingone marked this pull request as ready for review January 9, 2026 18:24

Guikingone requested review from OskarStark and chr-hertel as code owners January 9, 2026 18:24

carsonbot added Chat Issues & PRs about the AI Chat component Feature New feature Status: Needs Review labels Jan 9, 2026

Guikingone force-pushed the chat/fork branch 2 times, most recently from c4e93d8 to 3c56296 Compare January 12, 2026 17:12

Guikingone changed the title ~~[Chat] Introduce Chat::fork and multi-session support~~ [Chat] Introduce Chat::branch and multi-session support Jan 12, 2026