Django REST-framework: Using serializer for simple ForeignKey-relationship

Question

I'm using the django REST-framework and try to map a simple foreign-key relationship to provide related data for further use, similar to the following request:

Using reverse relationships with django-rest-framework's serializer

Instead of a result, I receive the following exception:

Got AttributeError when attempting to get a value for field album_name on serializer AlbumSerializer. The serializer field might be named incorrectly and not match any attribute or key on the int instance. Original exception text was: 'int' object has no attribute 'album_name'.

Models:

    class Album(models.Model):
        album_name = models.CharField(max_length=100)
        artist = models.CharField(max_length=100)

    class Track(models.Model):
        # album = models.ForeignKey(Album, related_name='tracks', on_delete=models.CASCADE)
        album = models.ForeignKey(Album, related_name='tracks', on_delete=models.CASCADE)
        order = models.IntegerField()
        title = models.CharField(max_length=100)
        duration = models.IntegerField()

        class Meta:
            unique_together = ('album', 'order')
            ordering = ['order']

        def __unicode__(self):
            return '%d: %s' % (self.order, self.title)

Serializers:

class AlbumSerializer(serializers.ModelSerializer):
    class Meta:
        model = Album
        fields = ('id', 'album_name', 'artist' )
class TrackSerializer(serializers.ModelSerializer):
    album_id = AlbumSerializer(many=False, read_only=True)
    class Meta:
        model = Track
        fields = ('order', 'title', 'duration', 'album_id')

View:

class TrackView(viewsets.ModelViewSet):
    queryset = Track.objects.all().select_related('album')
    serializer_class = serializers.TrackSerializer

What I have tried so far:

1. Serializing Albums with related tracks as nested serializers, using a reverse relationship => works
2. Doing the work just for the TrackSerializer without nested Album => works
3. Doing the work just for the AlbumSerializer => works
4. Using the TrackSerializer as shown in the code-section but reducing the AlbumSerializer by every field except for the primary key 'id' => works (but I would need the whole data set of album)
5. Changed the nested Serializer to a many-relationship by setting many=True. => dumps, since the framework tries to iterate on all fields of AlbumSerializer.

Since I'm running out of ideas and material to browse for I'm asking the question: How to list all or single attributes (!= PrimaryKey) of Album for each Track in regards to my example.

Answer 1

album_id in Track model is just album's primary key, so you have int type in error description. You need to specify whole album object by using album field instead of album_id:

class TrackSerializer(serializers.ModelSerializer):
    album = AlbumSerializer(many=False, read_only=True)
    class Meta:
        model = Track
        fields = ('order', 'title', 'duration', 'album')