序列化外键对象时，我将获得对象ID而不是对象。非常感谢任何关于如何获取不包括PK的对象的建议。

输出：

"biosamples": [
                    {
                        "short_form": "BTO_0004725","label": "embryonic fibroblast","ontology": 1
                    }
                ],

型号：

class Biosample(models.Model):
    biosample_id = models.AutoField(primary_key=True)
    ontology     = models.ForeignKey('Ontology',models.DO_NOTHING,related_name='biosample_ontologies')
    short_form   = models.CharField(max_length=255,unique=True )
    label        = models.CharField(max_length=255)

    class Meta:
        managed = True
        db_table = 'biosample'

    def __str__(self):
        return self.label

class Ontology(models.Model):
    ontology_id     = models.AutoField(primary_key=True)
    name            = models.CharField(unique=True,max_length=255)
    short_name      = models.CharField(max_length=255)
    url             = models.CharField(max_length=255)
    base_url        = models.CharField(max_length=255)
    rest_base_url   = models.CharField(max_length=255)
    prefix          = models.CharField(max_length=255,unique=True)

    class Meta:
        managed = True
        db_table = 'ontology'

    def __str__(self):
        return self.name

序列化器：

class OntologieSerializer(base.ObjectSerializer):
    class Meta:
        model = Ontology
        fields = '__all__'

class BiosampleSerializer(base.ObjectSerializer):
    class Meta:
        model = Biosample
        fields = '__all__'

    ontology     = OntologieSerializer(hidden=['ontology_id'])

ObjectSerializer（数据是从电子表格中读取的，字符串必须为空才能加载）：

class ObjectSerializer(serializers.ModelSerializer):
    def to_representation(self,instance):
        data = super().to_representation(instance)
        # Need empty string for loading
        return {key: ('' if data[key] is None else value) for key,value in data.items()}

谢谢！