我正在使用 Django RestFramework 創建一個簡單的電子商務 API，其中一個產品可以有許多影像，我想在 json 欄位上獲取所有這些影像的 URL。
現在，我在序列化程式上使用“imagembicicleta_set.all.first.image.url”獲得了第一個圖片網址，但我需要所有網址串列：
{
"count": 7,
"next": null,
"previous": null,
"results": [
{
"id": 1,
"nome": "Specialized Roubaix",
"marca__nome": "Specialized",
"categoria": "Bicicletas de Estrada",
"atividades": [
1
],
"terrenos": [
"Asfalto"
],
"preco": "16999.00",
"ano": 1,
"absolute_url": "/bicicletas/Specialized/specialized-roubaix-2020/",
"img_url": "/media/images/bicicletas/roubaix1.jpeg"
},
{
"id": 2,
"nome": "Specialized Roubaix Sport",
"marca__nome": "Specialized",
以下是我的設定：
模型.py
class Bicicleta(models.Model):
id = models.AutoField(primary_key=True)
nome = models.CharField(max_length=200, blank=False, null=False)
slug = models.SlugField(unique=True)
status = models.IntegerField(choices=STATUS_CHOICES, default=1, blank=False, null=False)
descricao = RichTextField(blank=True, null=True)
marca = models.ForeignKey(MarcaBicicleta, blank=True, null=True, on_delete=models.SET_NULL)
...
class ImagemBicicleta (models.Model):
bicicleta = models.ForeignKey(Bicicleta, default=None, on_delete=models.CASCADE)
image = models.ImageField(upload_to='images/bicicletas')
序列化器.py
class BicicletasSerializer(serializers.ModelSerializer):
marca__nome = serializers.CharField(source='marca.nome')
categoria = serializers.CharField(source='categoria.nome')
terrenos = serializers.StringRelatedField(many=True)
absolute_url = serializers.URLField(source='get_absolute_url', read_only=True)
img_url = serializers.URLField(source='imagembicicleta_set.all.first.image.url', read_only=True) #I could get the first image using this
class Meta:
model = Bicicleta
fields = ['id', 'nome', 'marca__nome', 'categoria', 'atividades', 'terrenos', 'preco', 'ano', 'absolute_url', 'img_url']
視圖.py
class BicicletasView(generics.ListAPIView):
serializer_class = BicicletasSerializer
queryset = Bicicleta.objects.all()
filter_backends = (DjangoFilterBackend, SearchFilter)
filterset_fields = ['marca', 'terrenos', 'status']
search_fields = {'nome': ['icontains'], }
如何獲取該欄位中的所有影像 URL？
例如，如果一個產品有 3 個不同的影像，我希望 img 欄位是這樣的：
"img_url": [ "/media/images/bicicletas/roubaix1.jpeg","/media/images/bicicletas/roubaix2.jpeg","/media/images/bicicletas/roubaix3.jpeg" ],
uj5u.com熱心網友回復：
您可以添加一個方法序列化程式，它將收集每個單獨物件的所有 url，如下所示：
class BicicletasSerializer(serializers.ModelSerializer):
marca__nome = serializers.CharField(source='marca.nome')
categoria = serializers.CharField(source='categoria.nome')
terrenos = serializers.StringRelatedField(many=True)
absolute_url = serializers.URLField(source='get_absolute_url', read_only=True)
img_url = serializers.SerializerMethodField()
def get_image_url(self , instance):
return ImagemBicicleta.objects.filter(bicicleta=instance).values_list('image',flat=True)
class Meta:
model = Bicicleta
fields = ['id', 'nome', 'marca__nome', 'categoria', 'atividades', 'terrenos', 'preco', 'ano', 'absolute_url', 'img_url']
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