Django Rest Framework-筛选序列化器字段 [英] Django rest framework - filtering for serializer field

问题描述

我对Django REST-full框架有疑问。

I have question about Django REST-full framework.

当产品呈现到远程客户端时，每个产品都将包含过滤数据。

When products have rendered into remote client, each of product takes a filed with filtered data.

例如，模型可能像这样。

For example, model may be like this.

 class Product(models.Model):
      name = models.CharField()

 class Like(models.Model):
      product = models.ForeignKey(Product, related_name="likes")

在客户上，每喜欢的产品均以真实值而非错误值进行计数。

On the client, each likes of product counted with true value, not false.

所以我在序列化器中尝试了以下代码。

So I tried with below code in the serializer.

class ProductSerializer(serializers.ModelSerializer):

    likes = serializers.PrimaryKeyRelatedField(many=True, queryset=Like.objects.filter(whether_like=True))

    class Meta:
        model = Product
        fields = ('id', 'name', 'likes')

但是，这不符合我的期望。

But, that is not working as I wanted.

我该怎么办？

以下是额外的视图代码。

The following is extra view code.

@api_view(['GET'])
def product_list(request, user_id, format=None):

    if request.method == 'GET':
        products = Product.objects.all()
        serializer = ProductSerializer(products, many=True)

        return Response(serializer.data)

推荐答案

这样的事情怎么样：

class ProductSerializer(serializers.ModelSerializer):
    likes = serializers.SerializerMethodField('get_likes')

    def get_likes(self, product):
        qs = Like.objects.filter(whether_like=True, product=product)
        serializer = LikeSerializer(instance=qs, many=True)
        return serializer.data

    class Meta:
        model = Product
        fields = ('id', 'name', 'likes')

** LikeSerializer 。希望这可以帮助。

**LikeSerializer omitted for brevity. Hope this helps.

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