If you have a one to many or many to many association in your Ecto schema and you need to handle deleting all associated records when the primary record is deleted
Ecto.Schema includes a keyword option you can pass to your association
on_delete: :delete_all that you can utilize. This will make sure that all child records are deleted before the operation is complete:
has_many :items, on_delete: :delete_all
Interest in more Ecto options? I wrote on post on setting primary keys you can find here.