Upsert (Update or Insert) Person Record

[nelsonic]

At present we are inserting an initial person into people in seeds.exs based on the ADMIN_EMAIL environment variable. This person is the (first) "admin" of the auth app.
They will have full control over the auth app. The issue is that we don't want to hard-code too much data into the seed.exs and we don't want to have 5 environment variables for defining the Admin person.
So when the Admin logs into the App for the first time, they see this:

When it should show this:

We need to update the person record for the Admin when they successfully login with their Google Account.

With that in mind we need an upsert_person/1 function.
This will be useful for anyone who updates their Google/GitHub profile e.g: their profile picture and wants that change to flow through to their @dwyl profile.

# Todo

• Create an upsert_person/1 function that accepts a person record and either creates a new record if one does not already exist or updates the existing record with the new values.

[nelsonic]

This is what I've got:

  def upsert_person(person) do
    case get_person_by_email(person.email) do
      nil ->
        create_person(person)

      ep -> # existing person
        merged = Map.merge(AuthPlug.Helpers.strip_struct_metadata(ep), person)
        {:ok, person} = changeset(%Person{id: ep.id}, merged)
        |> Repo.update()

        person
    end
  end

Does it seem reasonable to you?

[nelsonic]

The upsert_person/1 function works to update the "Admin" profile on first login:

This is included/used in #43