python - 如何将两个相同的值分组并从 django、DRF 中的其他字段获取值

Question

我正在努力将两个相同的字段值分组并在一个响应中显示它们的相关值。

模型.py:

class Book(models.Model):
    user = models.ForeignKey(User, on_delete = models.CASCADE, null = True, blank = True)
    image = models.ImageField(default = "Nana.jpg", upload_to = 'images/', null = True, blank = True)
    title = models.CharField(max_length = 150, unique = True)
    author = models.CharField(max_length = 100)
    category = models.CharField(max_length = 100)
    description = models.TextField(max_length = 5000, null = True, blank = True)
    published_date = models.DateField(null = True, blank = True)
    language = models.CharField(max_length = 100, null = True, blank = True, default = "Not selected")
    read_book_count = models.IntegerField(default = 0)


    def __str__(self):
        return self.title

View .py:

class BookAuthors(APIView):

def get(self, request):
    author = Book.objects.all()
    serializer = AuthorSerializer(author, many = True)
    return Response(serializer.data)

序列化器.py

class AuthorSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = ['title', 'author']

url.py

path('library/api/authors/', views.BookAuthors.as_view()),

我想将作者荷马和他的两个作品放在同一个地方，不要分开。

Answer 1

您需要使用具有不同作者的查询并更改序列化程序。

View .py

class BookAuthors(APIView):

def get(self, request):
    author = Book.objects.distinct('author')
    serializer = AuthorSerializer(author, many = True)
    return Response(serializer.data)

序列化器.py

class AuthorSerializer(serializers.ModelSerializer):
    titles = serializers.SerializerMethodField()

    class Meta:
        model = Book
        fields = ['author', 'titles']

    def get_titles(self, book):
        return list(Book.objects.filter(author=book.author).values_list('title', flat=True))

输出将是这样的

[
    ...
    
    {
        "author": "author1",
         "titles": ["title1", "title2"]

    },

    ...

]