django rest框架序列化程序提供“ serializers.Language.None”

Question

這是我的serializers.py

class GetCompanySerializer(serializers.ModelSerializer):
    language = serializers.CharField()
    class Meta:
        model = Company
        fields = ('company_name','started_from','country','email','website','ip','active','language')

這是我的views.py

class CompanyView(viewsets.ModelViewSet):
queryset =  Company.objects.all()
serializer_class = CompanySerializer

def get_serializer_class(self):
    serializer_class = self.serializer_class
    if self.request.method == 'GET':
        serializer_class = GetCompanySerializer
    return serializer_class

這是我的models.py

class Company(models.Model):
    company_id   = models.BigAutoField(primary_key=True)
    company_name = models.CharField(max_length=255)
    started_from = models.DateTimeField(auto_now=True)
    country      = models.CharField(max_length=255)
    email        = models.EmailField(max_length=254)
    website      = models.URLField()
    ip           = models.GenericIPAddressField(default=get_ip(),null=True,blank=True)
    active       = models.BooleanField(default=True)

    def __str__(self):
        return self.company_name

class Language(models.Model):
    language_id     = models.BigAutoField(primary_key=True)
    language_name   = models.CharField(max_length=255)
    language_logo   = models.FileField()
    created_on      = models.DateTimeField(auto_now=True)
    latest_build_on = models.DateTimeField(auto_now_add=True)
    latest_version  = models.DecimalField(max_digits=5, decimal_places=2)
    company         = models.ForeignKey('Company',on_delete=models.CASCADE,related_name='language')

    def __str__(self):
        return self.language_name

提供api：

[
    {
        "company_name": "Guido van dom rossum",
        "started_from": "2018-10-03T04:58:54.889132Z",
        "country": "Netherland",
        "email": "help@python.com",
        "website": "https://python.org",
        "ip": "127.0.0.1",
        "active": true,
        "language": "serializers.Language.None"
    }
]

它應該提供語言字段的語言名稱，而不是“ serializers.Language.None”。

請看看這個。

Answer 1

由於language是反向關系，因此不應將其作為CharField 。 因此，您必須定義LanguageSerializer()並將其映射到GetCompanySerializer ，如下所示，

class LanguageSerializer(serializers.ModelSerializer): class Meta: fields = '__all__' model = Language


class GetCompanySerializer(serializers.ModelSerializer):
    language = LanguageSerializer(many=True)

    class Meta:
        model = Company
        fields = ('company_name', 'started_from', 'country', 'email', 'website', 'ip', 'active', 'language')

---

如果希望獲得Language模型的__str__()表示，請使用StringRelatedField()代替CharField()

class GetCompanySerializer(serializers.ModelSerializer):
    language = serializers.StringRelatedField(many=True)


class Meta:
    model = Company
    fields = ('company_name', 'started_from', 'country', 'email', 'website', 'ip', 'active', 'language')</code></pre>