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Broadcast a status badge update on background processing

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                  class Export < ApplicationRecord
  enum status: { queued: 0, processing: 1, completed: 2, failed: 3 }

  after_update_commit -> {
    broadcast_replace_later_to(
      self,
      target: dom_id(self, :status),
      partial: 'exports/status',
      locals: { export: self }
    )
  }, if: :saved_change_to_status?
end

                  <%= turbo_frame_tag dom_id(export, :status) do %>
  <% klass = {
    'queued' => 'bg-gray-100 text-gray-700',
    'processing' => 'bg-blue-100 text-blue-800',
    'completed' => 'bg-green-100 text-green-800',
    'failed' => 'bg-red-100 text-red-800'
  }.fetch(export.status) %>

  <span class="inline-flex items-center rounded px-2 py-1 text-xs font-medium <%= klass %>">
    <%= export.status %>
  </span>
<% end %>

A lot of Rails apps have records that transition through states: queued, processing, done. With Hotwire, I render a status badge partial and broadcast replacements when the state changes. A background job updates the record, and the model broadcasts a replace to the stream. On the page, I wrap the badge in a turbo_frame_tag dom_id(record, :status) so it can be swapped cleanly. The benefit is instant feedback without polling. The key is broadcasting a partial that’s cheap to render and doesn’t accidentally load a bunch of associations. If the job can fail, I also broadcast an error badge with a retry link.

Henry Kim

More from Henry Kim

Broadcast a status badge update on background processing

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More from Henry Kim