musicus_mobile/lib/widgets/work_tile.dart

import 'package:flutter/material.dart';

import '../backend.dart';
import '../database.dart';

class WorkTile extends StatelessWidget {
  final Widget leading;
  final int workId;
  final void Function() onTap;

  WorkTile({
    this.leading,
    this.workId,
    this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    final backend = Backend.of(context);

    return StreamBuilder<Work>(
      stream: backend.db.workById(workId).watchSingle(),
      builder: (context, snapshot) {
        final titleText = snapshot.data?.title ?? '...';

        return StreamBuilder<List<Person>>(
          stream: backend.db.composersByWork(workId).watch(),
          builder: (context, snapshot) {
            final subtitleText = snapshot.hasData
                ? snapshot.data
                    .map((p) => '${p.firstName} ${p.lastName}')
                    .join(', ')
                : '...';
            return ListTile(
              leading: leading,
              title: Text(titleText),
              subtitle: Text(subtitleText),
              onTap: onTap ?? null,
            );
          },
        );
      },
    );
  }
}