Django rest framework serializing many to many field

Question

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 

Answer 1

You will need a TagSerializer, whose class Meta has model = Tag. After TagSerializer is created, modify the PostSerializer with many=True for a ManyToManyField relation:

class PostSerializer(serializers.ModelSerializer):     tag = TagSerializer(read_only=True, many=True)      class Meta:         model = Post         fields = ('tag', 'text',) 

Answer is for DRF 3