如何使用 TastyPie 在模型具有一对多自引用关系时创建记录?

How to create records when a model has one-to-many self referential relationship using TastyPie?

我正在使用 TastyPie 发出 POST 请求。 Task 模型通过 parent_task_id 字段具有一对多的自引用关系。

型号:

class Task(models.Model):
    title = models.CharField(max_length=100)
    description = models.TextField()
    parent_task_id = models.ForeignKey(
            "self",
            on_delete=models.CASCADE,
            null=True, blank=True)

在我的api.py

class TaskResource(ModelResource):
    parent_task_id_id = fields.ToOneField('self', 'id', null=True, full=True)

    class Meta:
        queryset = Task.objects.all()
        authorization = Authorization()
        allowed_methods = ['post']
        resource_name = "create_task"

当我使用 Postman 指定 parent_task_id 时,我无法创建任务。

{
    "title": "ABCDERT",
    "description": "world this week",
    "due_date": "2018-11-12 1:2:1",
    "parent_task_id_id": "2"
}

这是我在执行此操作时收到的错误消息:

  "error_message": "An incorrect URL was provided '2' for the 'CreateTaskResource' resource.",

您应该指定 parent_task 的 uri 而不是 id,例如

{ "title": "ABCDERT", "description": "world this week", "due_date": "2018-11-12 1:2:1", "parent_task_id_id": "/create_task/2" }

另外,这样定义资源中的外键字段是不正确的,

class TaskResource(ModelResource): parent_task_id_id = fields.ToOneField('self', 'id', null=True, full=True) 详情可以看docs

我调整你的例子,比如: 型号:

class Task(models.Model):
    title = models.CharField(max_length=100)
    description = models.TextField()
    parent_task = models.ForeignKey("self", on_delete=models.CASCADE, null=True, blank=True)

api.py

class TaskResource(ModelResource):
    parent_task = fields.ToOneField('self', 'parent_task', null=True,
        full=True)
    class Meta:
        queryset = Task.objects.all()
        authorization = Authorization()
        allowed_methods = ['post', 'get']
        filtering = {'id': ALL, 'parent_task': ALL_WITH_RELATIONS}
        resource_name = "task"
  1. 创建任务

POST身材喜欢:

{ "title": "task2", "description": "world this week", "due_date": "2018-11-12 1:2:1", "parent_task":"/api/v1/task/1/" }

  1. 外键查询

GET 参数如:

0.0.0.0:8000/api/v1/task/?parent_task__id=1