Programming Ecto

Adding Embeds to Another Schema

Now let’s set up the album schema that will use these embeds. This will be a regular schema, similar to what we’ve worked with earlier. We’ll need a new database table to go with it, as we’re storing our child records with embeds rather than associations.

Here’s what our new migration looks like:

priv/repo/migrations/20180516132926_add_albums_with_embeds.exs

def change do
  create table("albums_with_embeds") do
    add(:title, :string)
    add(:artist, :jsonb)
    add(:tracks, {:array, :jsonb}, default: [])
  end
end

The Ecto types for embeds are :map (for has-one relationships) and {:array, :map} (for has-many). At the database level, we use json (or possibly ...