Django rest 框架在序列化程序中检索列表

Question

请考虑以下示例。我有两个模型，一个Author和一个Article。它们看起来像这样：# author.pyfrom django.db import modelsclass Author(models.Model):    first_name = models.CharField(max_length=50)    last_name = models.CharField(max_length=50)    def __str__(self):        return self.first_name# article.pyfrom django.db import modelsfrom authors.models import Authorclass Article(models.Model):    author = models.ForeignKey(Author, on_delete=models.CASCADE)    text = models.TextField()    def __str__(self):        return self.text我的序列化程序看起来像这样：from rest_framework import serializersfrom .models import Articlefrom authors.serializers import AuthorSerializerclass ArticleSerializer(serializers.ModelSerializer):    author = AuthorSerializer()    class Meta:        model = Article        fields = '__all__'from rest_framework import serializersfrom .models import Authorclass AuthorSerializer(serializers.ModelSerializer):    class Meta:        model = Author        fields = '__all__'现在，如果我想从我的 API 中获取文章，那很简单。获取文章会附上作者，这一切都很好——但我如何得到相反的结果？例如，如果我想让作者拥有他们撰写的最新 5 篇文章？所以预期的输出将是这样的：{    "first_name": "Sethen",    "last_name": "Maleno",    "articles": [      {          "text": "some article"      },      {          "text": "another article"      }    ]}

Answer 1

class ArticleWithoutAuthorSerializer(ArticleSerializer):

    # Prevent author field serialization and endless nesting

    author = None

class AuthorSerializer(ModelSerializer):

    articles = SerializerMethodField()

    def get_articles(self, author):

        # Five recently posted articles

        articles = author.article_set.order_by('-published')[:5]

        return ArticleWithoutAuthorSerializer(articles, many=True).data

    class Meta:

        model = Author