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[英]How to auto populate a read-only serializer field in django rest framework?
[英]Django Rest Framework Read-Only Field Issue
我正在學習 DRF,但遇到了一個問題。 我在模型中有 slug 字段,我想從標題中對其進行 slugified。 問題是我無法以任何方式完成此自動填充。 我在模型中創建了自定義保存方法,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
然后我嘗試在 Serializer.py 中使用幾種方法使該字段只讀:
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}}
所有三種方式(ReadOnlyField、read_only_fields、extra_kwargs)都給我錯誤提示需要 slug。 我還嘗試在視圖中創建自定義“perform_create”,以便我可以將此 slugify 提供給 .save 方法,但沒有結果,因為 is.valid 給出 false
任何幫助表示贊賞! 謝謝
不知道為什么它讓你失望。 剛試過這個簡單的例子
# 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()
並為我工作
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