[Python] Django rest framework serializing many to many field

How do I serialize a many-to-many field into list of something, and return them through rest framework? In my example below, I try to return the post together with a list of tags associated with it.

models.py

class post(models.Model):
tag = models.ManyToManyField(Tag)
text = models.CharField(max_length=100)


serializers.py

class PostSerializer(serializers.ModelSerializer):
class Meta:
model = Post
fields = ("text", "tag"??)


views.py

class PostViewSet(viewsets.ReadOnlyModelViewSet):
queryset = Post.objects.all()
serializer_class = PostSerializer

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