我有一个简单的DRF REST API,我想用它来创建博客文章。我希望能够向这些博客文章添加标签,以便用户可以搜索标签并查看相关文章。但是,标签可能还不存在。我已经创建了一个带有ForeignKey字段的Article
模型到Tag
模型,如下所示:
class Tag(models.Model):
name = models.CharField(max_length=32)
def _str__(self):
return self.name
class Meta:
ordering = ('name',)
class Article(models.Model):
title = models.CharField(max_length=256)
author = models.ForeignKey(User, on_delete=models.CASCADE)
content = models.TextField()
date = models.DateTimeField(auto_now_add=True)
tags = models.ForeignKey(Tag, on_delete=models.CASCADE, blank=True, default=None)
def __str__(self):
return self.title
class Meta:
ordering = ('date', 'id')
理想情况下,我想要的是能够使用一组标签发布新的
Article
,并且如果不存在任何标签,则在数据库中创建它们。但是,就目前而言,标记必须已经存在才能添加到Article
。在视觉上,DRF将其显示为一个下拉列表,其中填充了预先存在的标签:如何从
Tag
API端点添加或创建多个Article
?编辑:根据要求,我已经添加了我的views.py
views.py:
from api.blog.serializers import ArticleSerializer, TagSerializer
from rest_framework import viewsets
# /api/blog/articles
class ArticleView(viewsets.ModelViewSet):
queryset = Article.objects.all()
serializer_class = ArticleSerializer
# /api/blog/tags
class TagView(viewsets.ModelViewSet):
queryset = Tag.objects.all()
serializer_class = TagSerializer
为了完整起见,这是我的REST API的serializers.py中的序列化器。
serializers.py:
class ArticleSerializer(serializers.ModelSerializer):
class Meta:
model = Article
fields = '__all__'
class TagSerializer(serializers.ModelSerializer):
class Meta:
model = Tag
fields = '__all__'
urls.py:
from rest_framework import routers
router = routers.DefaultRouter()
router.register('articles', views.ArticleView)
router.register('tags', views.TagView)
urlpatterns = [
path('', include(router.urls)),
]
最佳答案
覆盖序列化器的 create()
方法为
class ArticleSerializer(serializers.ModelSerializer):
tags = serializers.CharField()
class Meta:
model = Article
fields = '__all__'
def create(self, validated_data):
tag = validated_data.pop('tags')
tag_instance, created = Tag.objects.get_or_create(name=tag)
article_instance = Article.objects.create(**validated_data, tags=tag_instance)
return article_instance
关于python - Django Rest Framework-在POST上创建外键对象,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53027705/