Ecto Migrations and Associations in Elixir Projects

The article delves deep into the use of Ecto Migrations for Elixir projects. It begins by explaining the importance of planning the domain model of an application and structuring the database accordingly using migrations. The author takes a hands-on approach and walks through the practical aspects of creating migrations for a blog/courses web application. The tutorial includes instructions on creating user tables with fields such as 'username', 'full_name', 'email', 'role', and adding appropriate indexes. The write-up further covers nuances like single column indexes versus multi column indexes in Postgres. Besides migrations, the article explains how to create Ecto schemas and changesets, and utilize Phoenix generators to streamline the process. The article also tackles the creation of associations, explaining put_assoc and cast_assoc for handling associated data during inserts. In explaining these concepts, the article aims to offer detailed insights into Elixir’s Ecto library, complemented by clarifying practical examples.