Django Serializer方法字段

Question

似乎无法找到正确的谷歌搜索,所以在这里:

我的序列化程序中有一个字段:

likescount = serializers.IntegerField(source='post.count', read_only=True)

它计算所有相关字段"post".

现在我想将该字段用作我的方法的一部分:

def popularity(self, obj):
        like = self.likescount
            time = datetime.datetime.now()
            return like/time

这可能吗？

Answer 1

假设post.count用于衡量帖子上的喜欢数量而你实际上并不想在你的流行度方法中用时间戳划分整数,那么试试这个:

使用SerializerMethodField

likescount = serializers.SerializerMethodField('get_popularity')

def popularity(self, obj):
    likes = obj.post.count
    time = #hours since created
    return likes / time if time > 0 else likes

但是我建议你在你的模型中做一个属性

在你的模型中:

@property
def popularity(self):
    likes = self.post.count
    time = #hours since created
    return likes / time if time > 0 else likes

然后使用通用字段在序列化程序中引用它:

class ListingSerializer(serializers.ModelSerializer):
    ...
    popularity = serializers.Field(source='popularity')