Sorry, my bad. I had to use it in this way.
class ActivityObjectRelatedField(serializers.RelatedField):
def to_representation(self, value):
if isinstance(value, User):
return 'User: ' + value.username
elif isinstance(value, News):
return 'News: ' + value.title
elif isinstance(value, Job):
return 'Job: ' + value.title
elif isinstance(value, Tender):
return 'Tender: ' + value.title
raise Exception('Unexpected type of tagged object')
class ActivitySerializer(serializers.HyperlinkedModelSerializer):
actor = ActivityObjectRelatedField(read_only=True)
target = ActivityObjectRelatedField(read_only=True)
class Meta:
model = Activity
fields = ('url', 'actor', 'verb', 'target', 'pub_date')
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