1 | initial version |
To make a double nested serializer in Django, you need to create two serializers and nest one within the other. Here are the general steps:
Determine the model relationships: Identify which models are related to each other and how they are related.
Create the inner serializer: Write a serializer that represents the innermost model in the relationship. This serializer will need to include any fields that you want to serialize from the model.
Create the outer serializer: Write a serializer that represents the model that is one level above the innermost model. This serializer will include the inner serializer as a field.
Nest the inner serializer: In the outer serializer, include the inner serializer as a field. Use the source
argument to specify the relationship between the models that the inner serializer represents.
Test the serializer: Serialize some data using the outer serializer and ensure that the output is what you expect.
Here's some sample code that demonstrates the steps above:
from rest_framework import serializers
from .models import Author, Book, Chapter
# Step 2: Inner serializer
class ChapterSerializer(serializers.ModelSerializer):
class Meta:
model = Chapter
fields = ['title', 'text']
# Step 3: Outer serializer
class BookSerializer(serializers.ModelSerializer):
chapters = ChapterSerializer(many=True, read_only=True)
class Meta:
model = Book
fields = ['title', 'author', 'published_at', 'chapters']
# Step 4: Nest the inner serializer
class AuthorSerializer(serializers.ModelSerializer):
books = BookSerializer(many=True, read_only=True)
class Meta:
model = Author
fields = ['name', 'birth_date', 'nationality', 'books']
In this example, we have three models: Author
, Book
, and Chapter
. An author can write multiple books, and a book can have multiple chapters. The AuthorSerializer
is the outer serializer and includes the BookSerializer
, which is the inner serializer, as a field. The BookSerializer
includes the ChapterSerializer
as a field using the chapters
attribute.