Django Rest Framework: empty list when using RelatedField

Question

I have the following django models

class Cast(models.Model):
    coordinates = models.PointField()

class CastImage(models.Model):
    image = models.ImageField(upload_to="castimages")
    cast = models.ForeignKey(Cast, blank=True, null=True, related_name='images')

and the following serializer

class CastSerializer(serializers.ModelSerializer):
    images = serializers.RelatedField(many=True)
    class Meta:
        model = Cast
        fields = ('images',)

This all seems quite similar to what can be found in the doc: http://www.django-rest-framework.org/api-guide/relations#relatedfield

but when I test the serializer for the Cast object, although there really are images for those Cast objects (I checked), I only get empty images lists:

"results": [
        {
            "images": []
        }, 
        {
            "images": []
        }, 
        {
            "images": []
        } ]

What am I missing ?

I edited the question to make it clearer, but no, it's really Cast. I want to show the CastImage instances that have a foreign key pointing at my Cast instances, as explained here: django-rest-framework.org/api-guide/relations#relatedfield — madewulf
– madewulf, Commented Aug 21, 2014 at 9:22

klasske · Accepted Answer · 2014-08-21 06:45:29Z

1

If you're accessing the images through Cast, my guess would be that your fields are wrong. How about

class CastSerializer(serializers.ModelSerializer):
  images = serializers.RelatedField(many=True)
  class Meta:
    model = Cast
    fields = ('castimage__image',)

answered Aug 21, 2014 at 6:45

klasske

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1 Comment

madewulf Over a year ago

No, I do not think that is the problem: it just does not load the images, which it should, since I use the right "related_name".

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