Django Rest Framework 只读字段问题

Question

我正在学习 DRF，但遇到了一个问题。我想从标题中删除模型中的 slug 字段。问题是无论我尝试什么方式，我都无法完成这个自动填充。我在模型中创建了自定义保存方法，如下所示：

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


class Post(models.Model):
    options = (("draft", "Draft"), ("published", "Published"))
    
    category = models.ForeignKey(Category, on_delete=models.PROTECT, default=1)
    title = models.CharField(max_length=250)
    excerpt = models.TextField(null=True)
    content = models.TextField()
    slug = models.SlugField(max_length=250, unique_for_date="published")
    published = models.DateTimeField(default=timezone.now)
    author = models.ForeignKey(
        get_user_model(), on_delete=models.CASCADE, related_name="blog_posts"
    )
    status = models.CharField(max_length=10, choices=options, default="published")
    objects = models.Manager()
    postobjects = PostObjects()
    
    class Meta:
        ordering = ("-published",)
    
    def save(self, *args, **kwargs):
        self.slug = slugify(self.title)
        super().save(*args, **kwargs)
    
    def __str__(self):
        return self.title

然后我尝试在 Serializer.py 中通过几种方式使该字段只读：

class PostSerializer(serializers.ModelSerializer):
    slug = serializers.ReadOnlyField()

    class Meta:
        model = Post
        fields = ("id", "title", "author", "excerpt", "content", "status", "slug")
        #read_only_fields = ["slug"]
        #extra_kwargs = {'slug': {'read_only': True}}

所有三种方式（ReadOnlyField、read_only_fields、extra_kwargs）都会给我错误，即需要 slug。我还尝试在视图中创建自定义“perform_create”，这样我就可以将这个 slugify 提供给 .save 方法但再次没有结果，因为 is.valid 给出了错误

任何帮助表示赞赏！ 谢谢

Answer 1

不知道为什么它对你不利。 刚刚尝试了这个简单的例子

# models.py
from django.db import models
from django.utils.text import slugify


# Create your models here.
class MyModel(models.Model):

    title = models.TextField()
    slug = models.SlugField()

    def save(self, *args, **kwargs):
        self.slug = slugify(self.title)
        super().save(*args, **kwargs)

# serializers.py
from rest_framework import serializers

from .models import MyModel


class MyModelSerializer(serializers.ModelSerializer):

    class Meta:
        model = MyModel
        read_only_fields = ('slug', )
        fields = '__all__'

# views.py
from rest_framework import generics

from .models import MyModel
from .serializers import MyModelSerializer

# Create your views here.
class MyView(generics.CreateAPIView):

    serializer_class = MyModelSerializer
    queryset = MyModel.objects.all()

为我工作