Session Not Loaded #Ecto.Association.NotLoaded<association :sessions is not loaded>

Invoking Ctx.get_person! fails because the session is not pre-loaded
The people schema has the following association:

has_many :sessions, App.Ctx.Session

We want this association.
But not having the the :session pre-loaded means a bunch of tests are failing ... 😞

  1) test people update_person/2 with invalid data returns error changeset (App.CtxTest)
     test/app/ctx_test.exs:184
     ** (UndefinedFunctionError) function App.Ctx.Person.fetch/2 is undefined (App.Ctx.Person does not implement the Access behaviour)
     code: person = person_fixture()
     stacktrace:
       (app) App.Ctx.Person.fetch(%App.Ctx.Person{__meta__: #Ecto.Schema.Metadata<:built, "people">, email: nil, email_hash: nil, familyName: nil, givenName: nil, id: nil, inserted_at: nil, key_id: nil, locale: nil, password_hash: nil, picture: nil, sessions: #Ecto.Association.NotLoaded<association :sessions is not loaded>, status: nil, tag: nil, updated_at: nil, username: nil, username_hash: nil}, "email")
       (elixir) lib/access.ex:267: Access.get/3
       (app) lib/app/ctx/person.ex:28: App.Ctx.Person.changeset/2
       (app) lib/app/ctx.ex:251: App.Ctx.create_person/1
       test/app/ctx_test.exs:138: App.CtxTest.person_fixture/1
       test/app/ctx_test.exs:185: (test)



Finished in 0.4 seconds
45 tests, 1 failure, 44 excluded

Randomized with seed 123741

Todo

• add Repo.preload([:session]) to Ctx.get_person!/1
• debug ...

Note: this only happens when I attempt to actually hash the email address 🙄

Start with test/app/ctx_test.exs and the failing person_fixture stack trace, then read lib/app/ctx.ex and lib/app/ctx/person.ex around get_person!/1 and changeset/2. Reproduce the failure and verify the session association behavior; done means the affected tests no longer fail when email hashing runs.