Strange `CaseClauseError`

I guess @NobbZ I was referring to somewhat like a typesafety advantage that is

It is basically the same as an imaginary user when is_struct(user, User) -> ….

I’m not sure what you otherwise mean by " offering the same advantage as somewhat like ensuring that the input is of the same User struct".

yes @NobbZ thank you so much!
Is user = %User{} -> offering the same advantage as somewhat like ensuring that the input is of the same User struct?

The user case as the most generic clause has to come last, alternatively you could make it user = %User{} or something similar.

I’m not a JWT power user or anything but can’t you just do

  def render("token.json", %{user: user}) do
    data = %{id: user.id, email: user.email, username: user.username}
    jwt = %{data: data, sub: user.id}
    token = MyAppWeb.Token.generate_and_sign!(jwt)
    %{token: token}
  end

I actually already have gone thru the documentation but what I can’t seem to do is the conversion of

%{data: %{id: user.id, email: user.email, username: user.username}, sub: user.id}

into a format that I can easily convert into

def token_config do
    default_claims()
    |> add_claim("some_claim", nil, &(&1 == "some value"))
  end

should I add each claim one by one lilke

...
|> add_claim("id", nil, &(&1 == user.id))
|> add_claim("email", nil, &(&1 == user.email))
|> add_claim("username", nil, &(&1 == user.username))
...

?

Yes, after you create that module in accordance with the Joken docs.

So with my case it should be

token_with_default_plus_custom_claims = MyApp.Token.generate_and_sign!(jwt)

?

Right, so your issue is that Joken — Joken v2.6.2 isn’t really built to be called explicitly, the docs call for you to have a MyApp.Token module that handles this stuff. The first arg to Joken — Joken v2.6.2 is the token configuration. If you look at some examples you’ll see that if you want to encode stuff like the user id and email that should be done as so:

extra_claims = %{"user_id" => "some_id"}
token_with_default_plus_custom_claims = MyApp.Token.generate_and_sign!(extra_claims)

Joken 2.0 @benwilson512