Django 序列化程序数据

Question

我需要在'title'而不是'id'中获得篮子的价值。

我该怎么做？如何使用 ManyToManyField 从另一个“客户端”模型中的“位置”模型获取“标题”的值。它会自动传输 ID 并且需要“标题”

我试过很多方法但是...一定很简单，但是我搜索信息2天

class Position(models.Model):
    title = models.CharField(max_length=150, verbose_name='Title')
    slug = models.SlugField(max_length=100, unique=True, db_index=True, verbose_name='URL')
    description = models.CharField(max_length=500, verbose_name='Describe')
    photo = models.ImageField(upload_to="photos/%Y/%m/", verbose_name='Photo', null=True)
    price = models.DecimalField(decimal_places=2, max_digits=10, verbose_name='Price')
    date_create = models.DateTimeField(auto_now_add=True, verbose_name='Date create')
    date_update = models.DateTimeField(auto_now=True, verbose_name='Date update')
    is_published = models.BooleanField(default=True, verbose_name='Is published')
    in_stock = models.BooleanField(default=True, verbose_name='In stock')


class Client(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    basket = models.ManyToManyField('Position', default=None, blank=True, related_name='basket')

    def __str__(self):
        return f'{self.user.username}, id-{self.user.id}'

class ClientSerializer(serializers.ModelSerializer):

    class Meta:
        model = Client
        fields = "__all__"

class ClientViewSet(viewsets.ModelViewSet):
    serializer_class = ClientSerializer
    permission_classes = (IsOwnerOrReadOnly,)

    def get_queryset(self):
        pk = self.kwargs.get('pk')
       # need a list of objects, not an one
        return Client.objects.filter(pk=pk)

结果：

{
"id": 1,
"user": 1,
"basket": [
1
]
}

需要这样的东西 - “篮子”：['显示器'，'键盘']

Answer 1

您可以使用 PositionSerializer 获取 Client 篮子 ManyToManyField 中每个 Position 对象的标题。

class PositionSerializer(serializers.ModelSerializer):
class Meta:
    model = Position
    fields = ('title',)


class ClientSerializer(serializers.ModelSerializer):
basket = PositionSerializer(many=True, read_only=True)

class Meta:
    model = Client
    fields = "__all__"

Answer 2

我找到了解决方案：

class ClientSerializer(serializers.ModelSerializer):
# need to get title from Position, not id
basket = serializers.SerializerMethodField(method_name='get_position')
class Meta:
    model = Client
    fields = "__all__"

def get_position(self, obj):
    list = Client.objects.get(id=obj.id).basket.all()
    return [position.title for position in list]

不要向我扔西红柿，我只是在编程方式的开始:)

需要使用get_position方法是因为Client-table中的数据 存储在 Id