Django Rest Framework relation Attribute error

Question

I'm fighting to find my way into DRF and can't get related data into my endpoint.

models.py

class ChapterMark(models.Model):
    title           = models.CharField(max_length=100, null=True)
    episode         = models.ForeignKey(Episode, on_delete=models.CASCADE)
    start_time      = models.CharField(max_length=20)


class Episode(models.Model):
    title           = models.CharField(max_length=100, blank=False)
    show            = models.ForeignKey(Show, on_delete=models.PROTECT)

serializers.py

class ChapterMarkSerializer(serializers.ModelSerializer):
    class Meta:
        model = ChapterMark
        exclude = ('')

class EpisodeSerializer(serializers.ModelSerializer):
    chapters = ChapterMarkSerializer(source='id')

    class Meta:
        model = Episode
        depth = 1

The error I'm getting is

Got AttributeError when attempting to get a value for field start_time on serializer ChapterMarkSerializer. 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 'start_time'.

My guess is that the relation via source='id' just doesn't work but everything I found so far is pointing back to doing it that way.

There's a many to one relationship between chapters and episodes (so each episode has many chapters). I'm sure I'm just missing an important part.

neverwalkaloner · Accepted Answer · 2018-04-29 09:24:16Z

2

To get reverse relation object use chaptermark_set as source of chapters field, also dont forget to add many=True since episode can have miltiple chapters:

class EpisodeSerializer(serializers.ModelSerializer):
    chapters = ChapterMarkSerializer(source='chaptermark_set', many=True)

    class Meta:
        model = Episode
        depth = 1

answered Apr 29, 2018 at 9:24

neverwalkaloner

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1 Comment

Helmi Over a year ago

awesome, thanks. I had many=Truein there before but got confused by other errors and took it out. Works now.

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