python - Django Rest序列化2级字段

Question

您好，我需要在 2 级引用项的序列化器中添加一个字段。

我有以下模型:

模型.py:

class Company(models.Model):
   companyName = models.CharField(max_length=50, blank=True)

class Poll(models.Model):
   questionString = models.CharField(max_length=500, blank=True)
   companyId = models.ForeignKey(Company, null=True, db_column='companyId', blank=True)

class PossibleAnswer(models.Model):
   answerString = models.CharField(max_length=100, blank=True)
   pollId = models.ForeignKey(Poll, null=True, db_column='pollId', blank=True,related_name='answers')
   token = models.CharField(max_length=10, blank=True)

序列化器.py:

class PossibleAnswerSerializer(serializers.ModelSerializer):
   #companyId = serializers.RelatedField()
   class Meta:
       model = PossibleAnswer
       fields = ('answerString', 'token', 'pollId', 'companyId')

我想为PossibleAnswer对象创建一个序列化器，该对象有一个名为company的字段。如何做这个引用？类似于:django 查询集过滤器中的 pollId__companyId。

Answer 1

另一个解决方案...

class PossibleAnswerSerializer(serializers.ModelSerializer):
   companyId = serializers.SerializerMethodField()

   def get_companyId(self, obj):
        return obj.pollId.companyId

   class Meta:
       model = PossibleAnswer
       fields = ('answerString', 'token', 'pollId', 'companyId',)