In the “Defining an update action” section
artist = Tunez.Music.get_artist_by_id!("an-artist-id")
should be:
{:ok, artist} = Tunez.Music.get_artist_by_id!("an-artist-id")
Otherwise the next line will fail with an error about resource ID
In the “Defining an update action” section
artist = Tunez.Music.get_artist_by_id!("an-artist-id")
should be:
{:ok, artist} = Tunez.Music.get_artist_by_id!("an-artist-id")
Otherwise the next line will fail with an error about resource ID