TypeError: 'int' object is not iterable serializer Django Serializer for one-to-many

Question

我遇到了一个奇怪的情况，以下是我的模型代码。

class Sector(models.Model):
    sector_name = models.CharField(max_length=255, null=False)
    sector_desc = models.CharField(max_length=1024, null=False)

    def __set__(self):
        return "{} - {}".format(self.sector_name, self.sector_desc)


class TrailCompany(models.Model):
    sector = models.ForeignKey(Sector, on_delete=models.CASCADE, related_name="sector_id")
    comp_name = models.CharField(max_length=255, null=False)
    comp_desc = models.CharField(max_length=1024, null=False)

    def __set__(self):
        return "{} - {}".format(self.sector, self.comp_name, self.comp_desc)


class Trail(models.Model):
    company = models.ForeignKey(TrailCompany, on_delete=models.CASCADE, related_name="company_id")
    trail_id = models.CharField(max_length=255, null=False)
    tri = models.CharField(max_length=255, null=False)
    exp_pdufa = models.CharField(max_length=255, null=False)

    def __set__(self):
        return "{} - {}".format(self.company, self.exp_pdufa, self.trail_id, self.tri, self.exp_pdufa)

以下是我的序列化程序代码，

class SectorSerializer(serializers.ModelSerializer):

    class Meta:
        model = Sector
        fields = '__all__'


class TrailCompanySerializer(serializers.ModelSerializer):
    sectors = SectorSerializer(source="sector_id", many=True)

    class Meta:
        model = TrailCompany
        fields = '__all__'


class TrailSerializer(serializers.ModelSerializer):
    companies = TrailCompanySerializer(source="company_id", many=True)

    class Meta:
        model = Trail
        fields = '__all__'

当我尝试对对象进行序列化时，出现了所述错误，

trail_query = Trail.objects.all()
        trails = TrailSerializer(trail_query, many=True)
        return Response({"success": True, 'trails': trails.data})

请帮我找出并解决问题。谢谢

Answer 1

您的错误似乎在以下行中：

companies = TrailCompanySerializer(source="company_id", many=True)

Trail<>TrailCompany从Trail的角度来看是一对一的关系。例如。 Trail 只知道与其相关的一个 TrailCompany。因此您不需要 many=True 属性。

我也认为来源应该是company而不是company_id。 company_id 是主键，而 company 是相关对象

Answer 2

所选答案不适合我。但是以下方法有效：

company = TrailCompanySerializer(many=True)

还记得将 company 放在 related_name 字段中，如下所示：

company = models.ForeignKey(TrailCompany, on_delete=models.CASCADE, related_name="company")

TypeError: 'int' object is not iterable serializer Django Serializer for one-to-many

TypeError: 'int' object is not iterable serializer Django Serializer for one-to-many

django

python-3.x

django-serializer

django-rest-framework