undefined function form/1

[jcsrb]

I added torch to an existing phoenix app and got this issue when compiling

== Compilation error in file lib/myapp_web/views/post_view.ex ==
** (CompileError) lib/myapp_web/templates/post/form.html.heex:1: undefined function form/1 (expected MyAppWeb.PostView to define such a function or for it to be imported, but none are available)

I think this is because the origin of the my app was in phoenix 1.5 without liveview that later was upgraded to 1.6 and therefor my MyAppWeb didn't have

# Import LiveView and .heex helpers (live_render, live_patch, <.form>, etc)
import Phoenix.LiveView.Helpers

in defp view_helpers

adding import Phoenix.LiveView.Helpers made it work as expected

I and creating and closing this issue for documentation reason in case someone else hits this
thanks

[jcsrb]

for phoenix_live_view > 0.18 that needs to be import Phoenix.Component
https://github.com/phoenixframework/phoenix_live_view/blob/master/CHANGELOG.md#0180-2022-09-20