django - 在 django rest 框架中，如何获取外键的值而不是 id

Question

抱歉我的英语不好希望你能明白我的意思。

输出即时消息:

[
    {
        "MainCatName": 1,
        "Name": "harry potter",
        "Image": "/media/101029496--sites-default-files-images-101029496-3176173-1748009911-hp.jp-1_MoxqrLp.jpg"
    },
    {
        "MainCatName": 2,
        "Name": "Princes Girl",
        "Image": "/media/character_princess_rapunzel_8320d57a.jpeg"
    },
    {
        "MainCatName": 3,
        "Name": "sex in the city",
        "Image": "/media/250px-SATC_Title.jpg"
    },
    {
        "MainCatName": 4,
        "Name": "who is dragon",
        "Image": "/media/Reggio_calabria_museo_nazionale_mosaico_da_kaulon.jpg"
    },
    {
        "MainCatName": 2,
        "Name": "drama queen",
        "Image": "/media/15241421_170761763390015_7913498865987146084_n.jpg"
    }
]

---

我想要什么:
我想返回表中的外键 (MainCatName) 值而不是 ID。即我的 models.py 中 [CategoryName = models.CharField(max_length=50)] 中的值

喜欢

[
    {
        "MainCatName": Story Books,
        "Name": "harry potter",
        "Image": "/media/101029496--sites-default-files-images-101029496-3176173-1748009911-hp.jp-1_MoxqrLp.jpg"
    },
    {
        "MainCatName": Darama,
        "Name": "Princes Girl",
        "Image": "/media/character_princess_rapunzel_8320d57a.jpeg"
    },
    {
        "MainCatName": Roamance,
        "Name": "sex in the city",
        "Image": "/media/250px-SATC_Title.jpg"
    },
    {
        "MainCatName": sex,
        "Name": "who is dragon",
        "Image": "/media/Reggio_calabria_museo_nazionale_mosaico_da_kaulon.jpg"
    },
    {
        "MainCatName": darama,
        "Name": "drama queen",
        "Image": "/media/15241421_170761763390015_7913498865987146084_n.jpg"
    }
]

这是我的代码:

veiws.py :

class GETCATVeiw(APIView):
    def get(self, request):
        data = Products.objects.only('MainCatName','Name','Image')
        serializer = GETCAT(data, many=True)
        return Response(serializer.data)

    def post(self):
        pass

---

模型.py :

class Category(models.Model):
    CategoryName = models.CharField(max_length=50)
    class Meta:
            verbose_name_plural = 'Categories'

        def __str__(self):
        return self.CategoryName

class Products(models.Model):
    MainCatName = models.ForeignKey(Category, on_delete=models.CASCADE)
    Name = models.CharField(max_length=50)
    Image = models.ImageField()
    Price = models.IntegerField()
    DiscriptionHeading = models.CharField(max_length=100)
    DiscriptionParagraph = models.TextField(max_length=1000)

    class Meta:
            verbose_name_plural = 'Products'

        def __str__(self):
            return str(self.MainCatName)+' - '+self.Name+' - '+str(self.Price)+' $'

---

序列化程序.py :

class GETCAT(serializers.ModelSerializer):
    class Meta:
        model = Products
        fields = ('MainCatName', 'Name', 'Image')

---

Answer 1

你有 SlugRelatedField为此:

class GETCAT(serializers.ModelSerializer):
    MainCatName = serializers.SlugRelatedField(read_only=True, slug_field='CategoryName')
    class Meta:
        model = Products
        fields = ('MainCatName', 'Name', 'Image')

编辑:我不确定它是否适用于 Products.objects.only('MainCatName','Name','Image') 因为您将跨越数据库关系。此外，您可能希望使用 select_related 来避免获得 N+1 数据库查询。