从 Django Rest Framework 响应中删除空字段 [英] Remove null fields from Django Rest Framework response

问题描述

我使用 django-rest-framework 开发了一个 API.我正在使用 ModelSerializer 返回模型的数据.

I have developed an API using django-rest-framework. I am using ModelSerializer to return data of a model.

models.py

class MetaTags(models.Model):
    title = models.CharField(_('Title'), max_length=255, blank=True, null=True)
    name = models.CharField(_('Name'), max_length=255, blank=True, null=True)

serializer.py

class MetaTagsSerializer(serializers.ModelSerializer):
    class Meta:
        model = MetaTags

回复

{
    "meta": {
        "title": null,
        "name": "XYZ"
    }
}

理想情况下，在 API 响应中，不应在响应中发送任何不存在的值.当 title 为 null 时，我希望响应为:

Ideally in an API response any value which is not present should not be sent in the response. When the title is null I want the response to be:

{
    "meta": {
        "name": "XYZ"
    }
}

推荐答案

我发现这个解决方案是最简单的.

I found this solution to be the simplest.

from collections import OrderedDict
from rest_framework import serializers

class NonNullModelSerializer(serializers.ModelSerializer):
    def to_representation(self, instance):
        result = super(NonNullModelSerializer, self).to_representation(instance)
        return OrderedDict([(key, result[key]) for key in result if result[key] is not None])

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