Turbo Streams: custom action for flash messages

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                  # config/initializers/turbo_stream_actions.rb
Turbo::Streams::TagBuilder.class_eval do
  def flash(message:, level: :notice)
    update('flash', partial: 'shared/flash', locals: { message: message, level: level })
  end
end

                  <%= turbo_stream.flash(message: 'Saved!', level: :notice) %>

Flash updates are common enough to deserve a first-class stream action. Defining a custom turbo-stream action keeps views tidy: instead of repeating turbo_stream.update, you can write <turbo-stream action="flash">.

Sarah Chen

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Turbo Streams: custom action for flash messages

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