def dict(self, metadata=False):
concert = super(Concert, self).dict()
concert['artist'] = self.artist.name
concert['tracks'] = sorted([track.dict() for track in self.tracks],
key=lambda x: x['number'])
if metadata:
try:
concert['metadata'] = Crawler.metadata(artist=self.artist.name)
except Exception as e:
concert['metadata'] = {"error": str(e)}
return concert
