Method: Turbo::StreamsHelper#turbo_stream_from

Defined in:
app/helpers/turbo/streams_helper.rb

#turbo_stream_from(*streamables, **attributes) ⇒ Object

Used in the view to create a subscription to a stream identified by the streamables running over the Turbo::StreamsChannel. The stream name being generated is safe to embed in the HTML sent to a user without fear of tampering, as it is signed using Turbo.signed_stream_verifier. Example:

# app/views/entries/index.html.erb
<%= turbo_stream_from Current.account, :entries %>
<div id="entries">New entries will be appended to this target</div>

The example above will process all turbo streams sent to a stream name like account:5:entries (when Current.account.id = 5). Updates to this stream can be sent like entry.broadcast_append_to entry.account, :entries, target: "entries".

Custom channel class name can be passed using :channel option (either as a String or a class name):

<%= turbo_stream_from "room", channel: RoomChannel %>

It is also possible to pass additional parameters to the channel by passing them through ‘data` attributes:

<%= turbo_stream_from "room", channel: RoomChannel, data: {room_name: "room #1"} %>

Raises an ArgumentError if all streamables are blank

<%= turbo_stream_from("") %> # => ArgumentError: streamables can't be blank
<%= turbo_stream_from("", nil) %> # => ArgumentError: streamables can't be blank

Raises:

  • (ArgumentError)
[View source] [View on GitHub]

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# File 'app/helpers/turbo/streams_helper.rb', line 56

def turbo_stream_from(*streamables, **attributes)
  raise ArgumentError, "streamables can't be blank" unless streamables.any?(&:present?)
  attributes[:channel] = attributes[:channel]&.to_s || "Turbo::StreamsChannel"
  attributes[:"signed-stream-name"] = Turbo::StreamsChannel.signed_stream_name(streamables)

  tag.turbo_cable_stream_source(**attributes)
end