In Django REST Framework, you can use nested serializers to handle nested JSON data when sending POST requests, even when the nested JSON data includes files. Nested serializers allow you to serialize and deserialize complex data structures, including related objects.

Here's an example of how to use nested serializers to handle POST requests with nested JSON data containing files:

  1. Define the Models: First, define your Django models and their relationships. For example, suppose you have two models, Author and Book, with a ForeignKey relationship between them (one author can have multiple books).

    # from django.db import models class Author(models.Model): name = models.CharField(max_length=100) class Book(models.Model): title = models.CharField(max_length=100) author = models.ForeignKey(Author, on_delete=models.CASCADE) cover_image = models.ImageField(upload_to='book_covers/')
  2. Create the Serializers: Next, create serializers for both Author and Book models. Since you want to support nested JSON data, you'll need to use nested serializers.

    # from rest_framework import serializers from .models import Author, Book class BookSerializer(serializers.ModelSerializer): class Meta: model = Book fields = ('id', 'title', 'cover_image') class AuthorSerializer(serializers.ModelSerializer): books = BookSerializer(many=True) # Nested serializer for related books class Meta: model = Author fields = ('id', 'name', 'books')
  3. Handle the POST Request: In your view, you can use the nested serializers to handle the nested JSON data, including files.

    # from rest_framework import generics from .models import Author from .serializers import AuthorSerializer class AuthorCreateView(generics.CreateAPIView): queryset = Author.objects.all() serializer_class = AuthorSerializer

    This view uses the AuthorSerializer to handle the incoming nested JSON data in a POST request. The serializer will automatically handle the deserialization and creation of the Author object along with the related Book objects and their cover images.

  4. Send the POST Request: When sending the POST request, make sure the nested JSON data is properly structured. For example:

    { "name": "John Doe", "books": [ { "title": "Book 1", "cover_image": <file data> }, { "title": "Book 2", "cover_image": <file data> } ] }

    Note that the <file data> should contain the actual file data, which could be a base64-encoded string or a file upload.

When you send the POST request with nested JSON data containing files, Django REST Framework and the nested serializers will take care of deserializing and handling the data, creating the Author object, and related Book objects with their respective cover images.

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