Fetching state for on-demand collections (for use with useLiveQuery)

[joshuadutton]

I'm using an on-demand query collection. If I'm fetching specific records for the first time, I want to show a loading indicator. When using on-demand, getting an empty array can mean either the data isn't found or it's still fetching. And the loading state only applies to the collection's initial load.

For now, I'm using a workout that shows loading when there is an absence of data and then not found after a timeout.

[joshuadutton]

I just noticed these properties on QueryCollectionUtils:

    /** Check if query is currently fetching (initial or background) */
    isFetching: boolean;
    /** Check if query is refetching in background (not initial fetch) */
    isRefetching: boolean;
    /** Check if query is loading for the first time (no data yet) */
    isLoading: boolean;
    /** Get current fetch status */
    fetchStatus: `fetching` | `paused` | `idle`;

But It's not clear yet if I can subscribe to those state changes. I guess I could write a custom hook that polls for those changes for a given collection.