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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 entities presence.ex
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lib/modules/entities/presence.ex 

defmodule PhoenixKit.Modules.Entities.Presence do

  @moduledoc """

  Presence tracking for collaborative entity editing.



  Uses Phoenix.Presence to track who is currently editing an entity or data record.

  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 an edit form, they join a Presence topic (e.g., "entity_edit:5")

  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. When a user closes a tab or navigates away:



  1. WebSocket disconnects

  2. LiveView process terminates

  3. Presence automatically cleaned up (via process monitoring)

  4. All other users receive presence_diff event instantly



  No manual cleanup or timeout configuration needed!



  ## Topics



  - Entity editing: "entity_edit:<entity_id>"

  - Data editing: "data_edit:<data_id>"

  """



  use Phoenix.Presence,

    otp_app: :phoenix_kit,

    pubsub_server: :phoenix_kit_internal_pubsub

end