Python Django 序列化程序方法字段
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Django Serializer Method Field
提问by John D
Can't seem to find the right google search for this so here it goes:
似乎无法找到正确的谷歌搜索，所以这里是：
I have a field in my serializer:
我的序列化程序中有一个字段：
likescount = serializers.IntegerField(source='post.count', read_only=True)
which counts all the related field "post".
它计算所有相关字段“post”。
Now I want to use that field as part of my method:
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
Is this possible?
这可能吗？
采纳答案by tomcounsell
assuming post.countis being used to measure the number of likes on a post and you don't actually intend to divide an integer by a timestamp in your popularity method, then try this:
假设post.count用于衡量帖子上的点赞数，并且您实际上并不打算在流行度方法中将整数除以时间戳，然后尝试以下操作：
use a 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
however I would recommend making this a property in your model
但是我建议将其作为您模型中的一个属性
in your model:
在您的模型中：
@property
def popularity(self):
likes = self.post.count
time = #hours since created
return likes / time if time > 0 else likes
then use a generic Fieldto reference it in your serializer:
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')
