Hi, you’re right turbo/02 does work.
I took a fresh copy of the code. turbo/01 sends HTML rather than TURBO_STREAM, so maybe it’s just not set up at that point.

Thanks that reduced the variables, it’s the turbo-rails gem version that breaks for me from v0.5.4 It won’t send a TURBO_STREAM (same on latest v0.5.9).

Looking forward to continuing the book with the older turbo-rails gem for now, thanks.

UPDATE: If I run yarn upgrade it breaks again, even with turbo-rails gem v0.5.3
But if I then paste the older yarn.lock lines back in for turbo-rails and turbo and run webpacker:install, it works again. Even though the version @hotwired/turbo-rails@^7.0.0-beta.2 is the same in both cases, yarn upgrade changes the t.r. version referenced below from beta.2 to beta.5 (and the turbo dependency from beta.1 to beta.4).

Pasting back to beta.2 and beta.1 for turbo-rails and turbo resp. fixes it (ie TURBO_STREAM requests).
So reverting to the red below fixes it. I’ve no idea if that’s significant!

yarn lock diff1774×508 124 KB

Unrelated but it seems the target type declaration is no longer needed (happy days): Uncaught (in promise) TypeError: setting getter-only property "elementToHideTarget"
Removing elementToHideTarget: HTMLElement fixes it