Django rest 框架在序列化程序中检索列表

debugcn 发表于 Dev

赛腾

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.py

from django.db import models


class 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.py

from django.db import models
from authors.models import Author


class 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 serializers
from .models import Article
from authors.serializers import AuthorSerializer


class ArticleSerializer(serializers.ModelSerializer):
    author = AuthorSerializer()

    class Meta:
        model = Article
        fields = '__all__'

from rest_framework import serializers
from .models import Author

class 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"
      }
    ]
}

亚历克斯·K

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

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