function realtimeToViewModel()

in src/components/Database/DataViewer/common/fetch.ts [88:114]

• 24 lines of code
• 4 McCabe index (conditional complexity)

function realtimeToViewModel(
  ref: firebase.database.Reference,
  queryParams: QueryParams
) {
  let query: firebase.database.Query;
  return once(ref).pipe(
    switchMap((snap) => {
      // The "default" query contains limitToFirst(50), so we can not blindly
      // apply the query to leaf nodes. leafNodeRef.limitToFirst(n) will yield
      // null data.
      if (snap.hasChildren()) {
        query = applyQuery(ref, queryParams);
        return toObservable(query);
      }
      return toObservable(ref);
    }),
    map(
      (snap): ViewModel => ({
        value: snap.hasChildren() ? undefined : snap.val(),
        children: snap.hasChildren() ? Object.keys(snap.val()) : NO_CHILDREN,
        isRealtime: true,
        isLoading: false,
        query,
      })
    )
  );
}