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python - 如何在 django RetrieveUpdateDestroyAPIView 中为模型字段设置自定义值？

问题描述

我的 api 视图中有这个 RetrieveUpdateDestroyAPIView 类，更新时它不会自动更新名为published的数据字段。我想在发送 PUT 请求时手动更新。我怎样才能做到这一点。这是代码

模型.py

from django.db import models
from django.contrib.auth.models import User
from django.utils import timezone


class Category(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name


class Post(models.Model):

    class PostObjects(models.Manager):
        def get_queryset(self):
            return super().get_queryset().filter(status='published')

    options = (
        ('published', 'Published'),
        ('draft', 'Draft')
    )

    category = models.ForeignKey(Category, on_delete=models.PROTECT, default=1)
    title = models.CharField(max_length=100)
    excerpt = models.TextField(null=True)
    content = models.TextField()
    slug = models.SlugField(max_length=250, unique_for_date=True)
    published = models.DateField(null=True, default=timezone.now)
    author = models.ForeignKey(
        User, on_delete=models.CASCADE, related_name='blog_posts', default=1)
    status = models.CharField(
        max_length=10, choices=options, default='published')
    objects = models.Manager()
    postobjects = PostObjects()

    class Meta:
        ordering = ('-published',)

    def __str__(self):
        return self.title

视图.py

from rest_framework import generics
from blog.models import Post
from .serializers import PostSerializer


class PostList(generics.ListCreateAPIView):
    queryset = Post.postobjects.all()
    serializer_class = PostSerializer


class PostDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = Post.objects.all()
    serializer_class = PostSerializer

标签： pythondjangodjango-rest-framework

解决方案

在 PostDetail 上，不要设置queryset属性，而是覆盖get_object方法以查找要更新的特定 POST 实例，然后确保在提交时在有效负载中发送“已发布”键：值对。

像这样的东西：

class PostDetail(generics.RetrieveUpdateDestroyAPIView):
  serializer_class = PostSerializer
  
  def get_object(self):
     _id = self.request.data.get('id')
     return get_object_or_404(Post, pk=_id)

样品放置请求：

{
    "id": 123,
    "title": "New Post Title",
    "published": <required-date-format-for-your-project>
}

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