Create a Book instance with multiple tags in Django REST Framework

Using Django Getting Started
5

Error:
“Got KeyError when attempting to get a value for field tags on serializer BookSerializer.\nThe serializer field might be named incorrectly and not match any attribute or key on the OrderedDict instance.\nOriginal exception text was: ‘tags’.”

Serializer class

book.tags.add(tag_obj) # Having an error in this line

Here I guess, tag_obj is being added to the book instance (id: uuid, tag: something) but I want my response model like,

{ ....
    tags: ['lesson']
}

not

tags: {
            id: uuid,
            name: 'lesson'
          }

Thanks for your kind response sir.