Neuread/Backend/NeureaAPI/neurea/api/usersbookscollections/serializers.py

from rest_framework import serializers
from content.models import UsersBooksCollections
from api.auth.serializers import UserPublicSerializer
from api.book.serializers import BookSerializer
from api.collection.serializers import CollectionSerializer

from content.models import Book, Collection


class UsersBooksCollectionsSerializer(serializers.ModelSerializer):
    user = UserPublicSerializer(read_only=True)
    book = BookSerializer()
    collection = CollectionSerializer()
    class Meta:
        model = UsersBooksCollections
        fields = [
            "uuid",
            "user",
            "book",
            "collection",
            "current_page",
            "created_at",
        ]
        read_only_fields = [
            "uuid",
            "created_at",
            "user"
        ]


class UsersBooksCollectionsPostSerializer(serializers.ModelSerializer):
    user = UserPublicSerializer(read_only=True)
    book_uuid = serializers.UUIDField(write_only=True)
    collection_uuid = serializers.UUIDField(write_only=True)

    class Meta:
        model = UsersBooksCollections
        fields = [
            "uuid",
            "user",
            "book_uuid",
            "collection_uuid",
            "current_page",
            "created_at",
        ]
        read_only_fields = [
            "uuid",
            "created_at",
            "user"
        ]

    def create(self, validated_data):
        book_uuid = validated_data.pop('book_uuid')
        collection_uuid = validated_data.pop('collection_uuid')

        try:
            book = Book.objects.get(uuid=book_uuid)
        except Book.DoesNotExist:
            raise serializers.ValidationError("Book not found.")

        try:
            collection = Collection.objects.get(uuid=collection_uuid)
        except Collection.DoesNotExist:
            raise serializers.ValidationError("Collection not found.")

        instance = UsersBooksCollections.objects.create(
            user=self.context['request'].user,
            book=book,
            collection=collection,
            **validated_data
        )
        return instance