django-rest-framework serializer for ContentType object

I am building an activity model, somewhat similar to this package. It has an actor, verb and the target.

class Activity(models.Model):

    actor_type = models.ForeignKey(ContentType, related_name='actor_type_activities')

    actor_id = models.PositiveIntegerField()

    actor = GenericForeignKey('actor_type', 'actor_id')

    verb = models.CharField(max_length=10)

    target_type = models.ForeignKey(ContentType, related_name='target_type_activities')

    target_id = models.PositiveIntegerField()

    target = GenericForeignKey('target_type', 'target_id')

    pub_date = models.DateTimeField(default=timezone.now)

Now whenever a new object of whichever models (Tender, Job and News) is created, a new Activity object is created, with the target being the objects of any of these three models.

eg. user (actor) published (verb) title (target)

class Tender(models.Model):

    title = models.CharField(max_length=256)

    description = models.TextField()

class Job(models.Model):

    title = models.CharField(max_length=256)

    qualification = models.CharField(max_length=256)

class News(models.Model):

    user = models.ForeignKey(settings.AUTH_USER_MODEL)

    title = models.CharField(max_length=150)

To get this data I am making an API which will get me the required json data. I am using django-rest-framework for this and very new with it.

class ActorSerializer(serializers.HyperlinkedModelSerializer):

    class Meta:

        model = User

        fields = ('id', 'username', 'email')

class ActivitySerializer(serializers.HyperlinkedModelSerializer):

    actor = ActorSerializer()

    class Meta:

        model = Activity

        fields = ('url', 'actor', 'verb', 'pub_date')

In the above serializers, I knew that actor will be the User. And so I used the User model for the ActorSerializer class. But as for the target, it can be any of these three models (News/Job/Tender).

How can I make a serializer (eg. TargetSerialier class) for the ContentType object so that I can use the target in the ActivitySerializer class field?

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