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Today I Learned: Composite Primary Keys using Elixir Ecto

https://til.hashrocket.com/posts/lgagvwjnev-composite-primary-keys-using-elixir-ecto
Hashrocket Today I Learned: Composite Primary Keys using Elixir Ecto Ecto allows us to map a table with composite primary keys into our schemas. The way to do that is by using the primary_key: true option for the Ecto.Schema.field/3 instead of dealing with the special module attr @primary_key. Check this out:
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