Can not render turbo_stream with only last 10 messages for each room

[viktorianer]

I'm just trying to render only the @messages = @room.messages.last(10), after a new message is created.
I tried 4 different ways, because I did not understand how to do it.

What I did is to render all messages after format.turbo_stream in messages_controller.rb, so in app/views/messages/create.turbo_stream.slim it looks like (I use Slim templates...):

= turbo_stream.replace :messages
  #messages
    == render partial: "messages/messages", locals: { messages: @messages }

And on sender side it works, and I see only the last 10 messages. But, because Message broadcasts_to :room, it will use append on the receiver side and each receiver see then 10 older messages and each appended one.

How can I use broadcasts_to :room or after_create_commit -> { broadcast_append_to room } respectively to broadcasts only last 10 messages for each room?

It should be possible to do this, right?

[viktorianer]

I just found out, in order to show the last 10 messages on sender side I could do in MessagesController this:

In create action just remove format.turbo_stream (and if you wish remove app/views/messages/create.turbo_stream.erb too) and it is working.
Also, no need for app/assets/javascripts/controllers/form_controller.js and data in app/views/messages/_form.html.slim.

Thanks a lot to @Deanout and this tutorial on YT https://youtu.be/NtTfYfWAzw0?t=1416

But, still, it will use append on the receiver side.