How do I use OneToMany serializers in Django REST Framework?

How do I use OneToMany serializers in Django REST Framework?

To use OneToMany serializers in Django REST Framework, you can define a parent serializer and a child serializer. The parent serializer will include a field that represents the related child objects.

Can you show me an example of how to set that up?

Sure! First, define your models. For example, if you have a Book model and an Author model, you can set up the serializers like this:

class Author(models.Model):
    name = models.CharField(max_length=100)

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author, related_name='books', on_delete=models.CASCADE)

Then, create the serializers:

class AuthorSerializer(serializers.ModelSerializer):
    books = BookSerializer(many=True, read_only=True)

    class Meta:
        model = Author
        fields = ['id', 'name', 'books']

class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = ['id', 'title', 'author']

This way, when you serialize an Author, it will include all related Books.

What if I want to create a new book for an existing author?

You can do that by overriding the create method in the BookSerializer. You would need to accept the author's ID in the request data and set it when creating the book.