如何 return manytomanyfield 作为 Django Rest Framework 中的对象 API

Question

我尝试用 Django RestFramework 创建一个 API，所以我创建了 2 个模型 Note 和 Task，并在 Note 模型中有一个 ManyToManyField，这样我就可以在一个 Note 中放置很多任务，但是 API我创建的不是 return 完整的对象功能，而是 id。这是我的代码：

class NoteAPI(ListAPIView):
    serializer_class = NoteSerializer
    queryset = Note.objects.all()

这是我的模型：

class Task(models.Model):
    task = models.CharField(max_length=255, null=False, blank=False)
    detail = models.CharField(max_length=255, null=True, blank=True)
    completed = models.BooleanField(default=False)
    priority = models.IntegerField(default=0)
    def __str__(self):
        return self.task

class Note(models.Model):
    title = models.CharField(max_length=255, null=False, blank=False)
    priority = models.CharField(max_length=1, choices=PRIORITY_CHOICES, default="B")
    detail = models.CharField(max_length=255, null=True, blank=True)
    completed = models.BooleanField(default=False)
    task = models.ManyToManyField(Task, related_name="note_task", blank=True)
    process = models.IntegerField( default=0, validators=[max_int_value])
    def __str__(self) -> str:
        return self.title + " is "+ str(self.process) + "% completed"

我希望输出罐看起来像：

 [
    {
            "id": 2,
            "title": "Sleep",
            "priority": "F",
            "detail": "Don't do it, stay awake and do your job",
            "completed": false,
            "process": 0,
            "task": [
                      {
                         "id": 1,
                         "task": "Go to bed",
                         "completed": false
                      },
                     {
                         "id": 2,
                         "task": "Start counting",
                         "completed": false
                      }
                    ]
     }
 ]

但实际上是这样

 [
    {
            "id": 2,
            "title": "Sleep",
            "priority": "F",
            "detail": "Don't do it, stay awake and do your job",
            "completed": false,
            "process": 0,
            "task": [
                      1,
                      2
                 ]
     }
 ]

那么我该怎么做才能得到这样的输出呢？

Answer 1

你需要告诉NoteSerializer如何序列化Task objectcs。

class TaskSerializer(serializers.ModelSerializer):
    class Meta:
        model = Task
        fields = ("id", "task", "completed")


class NoteSerializer(models.Model):
    task = TaskSerializer(many=True)

您可能还想预取任务以将数据库查询的数量保持在最低限度。

class NoteAPI(ListAPIView):
    serializer_class = NoteSerializer
    queryset = Note.objects.prefetch_related("task").all()

如何 return manytomanyfield 作为 Django Rest Framework 中的对象 API

How to return manytomanyfield as object in Django RestFramework API

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django-rest-framework