Today I Learned

A Hashrocket project

Get the association with Ecto

In the schema of my post model I have this line:

belongs_to :developer

So a post is associated with a developer. When I have a post struct and try to access the developer I might see this:

> Tilex.Repo.get(Tilex.Post, 42).developer
#Ecto.Association.NotLoaded<association :developer is not loaded>

Getting the developer is now a two step process:

  1. Construct a query based on the association
  2. Use that query to acquire the struct

To construct a query based on the association we can use the Ecto.assoc/2 function:

query = Ecto.assoc(post, :developer)

Then this query is executed with the function:

developer =

There ya go!

Looking for help? Elixir is quickly gaining momentum for web applications that need concurrency, performance, and the ability to connect to many different clients. The developers at Hashrocket are learning along with the rest of the development community that Elixir and Phoenix are viable Rails alternatives for the right application. Check out the source code for Today I Learned, written in Elixir, and contact us if you need help with your Elixir project.