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Clarify metadata behavior in Registry :via docs #14141

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Jan 3, 2025
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Clarify metadata behavior in Registry :via docs #14141

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11 changes: 11 additions & 0 deletions lib/elixir/lib/registry.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -48,9 +48,20 @@ defmodule Registry do
{:ok, _} = Registry.start_link(keys: :unique, name: MyApp.Registry)
name = {:via, Registry, {MyApp.Registry, "agent", :hello}}
{:ok, agent_pid} = Agent.start_link(fn -> 0 end, name: name)

Registry.lookup(MyApp.Registry, "agent")
#=> [{agent_pid, :hello}]

name_without_meta = {:via, Registry, {MyApp.Registry, "agent"}}
Agent.update(name_without_meta, fn x -> x + 1 end)
Agent.get(name_without_meta, & &1)
#=> 1

> #### With *and* without metadata {: .tip}
>
> When using the version of `:via` tuples with *metadata*, you can still use the version
> **without** metadata to look up the process.

To this point, we have been starting `Registry` using `start_link/1`.
Typically the registry is started as part of a supervision tree though:

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