django - 覆盖 Django REST Frameworks 更新方法以保存嵌套的序列化程序

Question

我是 DRF 的新手，我一直对如何覆盖 serializers.py 文件中的更新方法感到困惑。

这是我的模型。

class Quiz(models.Model):
    quiz_name = models.CharField(max_length=200)
    module_referred = models.ForeignKey(Course_Module, related_name="quiz")


class Course_Module(models.Model):
    name = models.CharField(max_length=200)

为这些模型创建的序列化程序如下:-

class QuizSerializer(serializers.HyperlinkedModelSerializer):
    questions = Quiz_QuestionSerializer(many=True)
    class Meta:
        model = Quiz
        fields = ('url', 'quiz_name', 'module_referred')



class Course_ModuleSerializer(serializers.HyperlinkedModelSerializer):
    quiz = QuizSerializer(many=True, required=False)
    class Meta:
        model = Course_Module
        fields = ('url', 'name', 'quiz')


    def create(self, validated_data):
        quiz_data = validated_data.pop('quiz')
        module = Course_Module.objects.create(**validated_data)
        for qd in quiz_data:
            Quiz.objects.create(module_referred = module, **qd)
        return module

    def update(self, instance, validated_data):
        # Somehow save instance with new quiz_data
        return instance 

上述模式的典型 JSON 表示如下:-

{
    "url": "http://localhost:8080/api/registration_courses_modules/51/",
    "name": "cdcsdc",
    "quiz": [{
            "url": "http://localhost:8080/api/registration_quiz/1/",
            "quiz_name": "Shash",
            "module_referred": "http://localhost:8080/api/registration_courses_modules/19/"
    }]
}

我想要实现的是从 Course_ModuleSerialzers Update 方法中调用 QuizSerializer 的创建方法，然后将其作为属性绑定(bind)到 Course_modules 实例。

非常感谢任何帮助。谢谢。

Answer 1

模型.py

class CourseModule(models.Model):
    name = models.CharField(max_length=200)

class Quiz(models.Model):
    quiz_name = models.CharField(max_length=200)
    module_referred = models.ForeignKey(CourseModule, related_name="quiz_set")

序列化器.py

class CourseModuleSerializer(serializers.HyperlinkedModelSerializer):
    quiz = QuizSerializer(many=True, required=False)
    class Meta:
        model = CourseModule
        fields = ('url', 'name', 'quiz')


    def create(self, validated_data):
        quiz_data = validated_data.pop('quiz', [])
        course_module = CourseModule.objects.create(**validated_data)
        if quiz_data:
            Quiz.objects.bulk_create(
              [
                 Quiz(module_referred=course_module, **quiz)
                 for quiz in quiz_data
              ],
            )
        return course_module

    def update(self, instance, validated_data):
        instance.name = validated_data.get('name', instance.name)

        quiz_data = validated_data.get('quiz')
        if quiz_data:
            instance.quiz_set.clear()
            Quiz.objects.bulk_create(
               [
                 Quiz(module_referred=instance, **quiz)
                 for quiz in quiz_data
               ],
            )
        instance.save()
        return instance