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python - django rest 框架序列化程序给出“serializers.Language.None”

问题描述

这是我的serializers.py

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

这是我的意见.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

这是我的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

给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"
    }
]

它应该为它提供“serializers.Language.None”的语言字段位提供语言名称。

请看看这个..

标签： pythondjangodjango-rest-frameworkdjango-serializer

解决方案

由于language是反向关系，因此不应该是CharField. 所以你必须定义一个LanguageSerializer()并将其映射到你GetCompanySerializer的如下，

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')


如果您希望获得模型的__str__()表示Language，请使用StringRelatedField()而不是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>

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