A track together with its chart standing.
Optional
The owning client, stored for later convenience calls.
Its chart standing.
The client that created this model, used by convenience methods.
The track.
Static
ChartItem
Protected
Assert that this model carries a client, returning it narrowed to non-null.
Convenience methods that need to call the API use this to fail fast with a clear message instead of a generic "cannot read property of undefined".
The owning Client.
When the model was created without a client.
A track together with its chart standing.