python之在 django rest 中自定义序列化器输出

我想自定义序列化器的输出... 我想在我的序列化程序输出中添加额外的字段..

我的模型:

class MatchupActivity(models.Model): 
    matchup_user = models.ForeignKey(MatchupUser) 
    question = models.ForeignKey(Question) 
    answer = models.ForeignKey(Answer) 
    points = models.PositiveIntegerField() 
    time = models.PositiveIntegerField() # in seconds 
 
    def __unicode__(self): 
        return u"%d - [%s]" % (self.id, self.matchup_user) 

我的序列化器:

class MatchupActivitySerializer(serializers.Serializer): 
    """ 
    """ 
 
    url = serializers.HyperlinkedIdentityField(view_name='matchupactivity-detail') 
    question = serializers.HyperlinkedRelatedField(queryset=Question.objects.all(), view_name='question-detail') 
    answer = serializers.HyperlinkedRelatedField(queryset=Answer.objects.all(), view_name='answer-detail') 
    points = serializers.IntegerField(required=True) 
    time = serializers.IntegerField(required=True) 
    matchup = serializers.HyperlinkedRelatedField(queryset=Matchup.objects.all(), view_name='matchup-detail') 
 
    def to_native(self, obj): 
        if 'matchup' in self.fields: 
            self.fields.pop('matchup') 
        return super(MatchupActivitySerializer, self).to_native(obj) 
 
    def restore_object(self, attrs, instance=None): 
        request = self.context.get('request') 
        field = serializers.HyperlinkedRelatedField(queryset=Matchup.objects.all(), view_name='matchup-detail') 
        matchup = self.init_data['matchup'] 
        matchup_user = MatchupUser.objects.get(matchup=field.from_native(matchup), user=request.user) 
        attrs['matchup_user'] = matchup_user 
        attrs.pop('matchup')       
        return MatchupActivity(**attrs) 

我想要的是在显示 MatchupActivity 列表中的 a 时显示匹配字段。 示例:

目前的响应是这样的..

{ 
    "url": "http://localhost:8000/matchup-activities/1/",  
    "question": "http://localhost:8000/questions/1/",  
    "answer": "http://localhost:8000/answers/1/",  
    "points": 1,  
    "time": 1 
} 

我想要这样的回应..

{ 
    "url": "http://localhost:8000/matchup-activities/1/",  
    "question": "http://localhost:8000/questions/1/",  
    "answer": "http://localhost:8000/answers/1/",  
    "points": 1,  
    "time": 1, 
    "matchup":{ 
        #matchup related fields... 
    } 
} 

请您参考如下方法:

为 MatchupUser 模型编写一个单独的序列化器，而不是使用:

matchup = serializers.HyperlinkedRelatedField(queryset=Matchup.objects.all(), view_name='matchup-detail') 

使用:

matchup = MatchupUserSerializer() 

按照指示 here