Calculated fields

How do we access calculated fields? In a serializer I would do something like

class ArtworkSerializer(serializers.ModelSerializer):
    url = serializers.URLField(source='get_absolute_url')

    class Meta:
        model = Artwork
        fields = ('id', 'title', 'url')

I assume I need to specify this somehow in class ArtworkNode(DjangoNode): but I’ve been unable to discover how.

[syrusakbary]

Sure. You can do it using arguments.

class Query(graphene.ObjectType):
    artwork = graphene.Field(ArtworkNode, slug=graphene.String())

    def resolve_artwork(self, args, info):
        return Artwork.get_by_slug(args.get('slug', None))

Then you can query it with the following query:

{
  artwork(slug:"my_slug") {
    id
    title
  }
}

Hope it helps!

[syrusakbary]

Great! However I’m going to add the source option to fields! It makes it much more pleasant to develop!

So you can do something like

class ArtworkNode(DjangoNode):
    url = graphene.String(source='get_absolute_url')

    class Meta:
        model = Artwork
        filter_fields = ['id', 'title']