A Quick Overview of Caller Tracking in Elixir

This guide introduces the concept of caller tracking in Elixir, which has been part of the language since 2018 but is not widely understood. Caller tracking allows developers to trace which processes are interrelated and manage the access permissions of resources in asynchronous testing, such as Ecto transactions and Mox mocks. The guide explains how to implement caller tracking when using GenServer, emphasizing that the process dictionary must include caller information to allow access to resources during testing. Furthermore, it provides a code example demonstrating how to set up a GenServer with caller tracking enabled, ensuring seamless access to Ecto transactions. The content also encourages further exploration of related topics in Elixir.