Model broadcasts: prepend on create, replace on update

388 views

                  class Notification < ApplicationRecord
  belongs_to :member

  after_create_commit -> { broadcast_prepend_to stream_name, target: "notifications", partial: "notifications/notification", locals: { notification: self } }
  after_update_commit -> { broadcast_replace_to stream_name, partial: "notifications/notification", locals: { notification: self } }

  def stream_name
    [member, :notifications]
  end
end

                  <%= turbo_stream_from [current_member, :notifications] %>
<div id="notifications"><%= render @notifications %></div>

When updates can happen from multiple places, model-level broadcasts keep the UI consistent across tabs without sprinkling stream logic in controllers. Use after-commit hooks so broadcasts only occur once the write is durable.

Sarah Chen

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Model broadcasts: prepend on create, replace on update

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