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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more

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phoenix_kit lib modules publishing presence.ex
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lib/modules/publishing/presence.ex 

defmodule PhoenixKit.Modules.Publishing.Presence do

  @moduledoc """

  Presence tracking for collaborative post editing.



  Uses Phoenix.Presence to track who is currently editing a post.

  The first person to join a topic becomes the "owner" (can edit), and everyone else

  becomes "spectators" (read-only mode).



  ## How It Works



  1. When a user opens the editor, they join a Presence topic (e.g., "publishing_edit:docs:post-slug")

  2. Presence tracks all connected users with metadata (user info, joined_at timestamp)

  3. Users are sorted by joined_at to determine order (FIFO)

  4. First user in the sorted list = owner (readonly?: false)

  5. All other users = spectators (readonly?: true)

  6. When owner leaves, Presence removes them automatically

  7. All connected users receive presence_diff event

  8. Each user re-evaluates: "Am I first now?"

  9. New first user auto-promotes to owner



  ## Automatic Cleanup



  Phoenix.Presence automatically detects when LiveView processes die and removes

  them immediately via process monitoring. No manual cleanup needed.



  ## Topics



  - Post editing: "publishing_edit:<form_key>"

  """



  use Phoenix.Presence,

    otp_app: :phoenix_kit,

    pubsub_server: :phoenix_kit_internal_pubsub

end