addTracks method
Adds a collection of uris
(i.e each list
item in the format of "spotify:track:4iV5W9uYEdYUVa79Axb7Rh") to a
playlist with playlistId
Implementation
Future<void> addTracks(List<String> uris, String playlistId) async {
assert(playlistId.isNotEmpty, 'No playlist id was provided');
assert(uris.isNotEmpty, 'No uris provided');
final url = 'v1/playlists/$playlistId/tracks';
await _api._post(url, jsonEncode({'uris': uris}));
}