錯誤
AssertionError: The `.create()` method does not support writable dotted-source fields by default.
Write an explicit `.create()` method for serializer `hrm_apps.configuration.serializers.CurrencySerializer`, or set `read_only=True` on dotted-source serializer fields.
模型.py,
class CurrencyMaster(models.Model):
code = models.CharField(max_length=3, null=False, unique=True)
name = models.CharField(max_length=100, null=False, unique=True)
def __str__(self):
return self.name
class Currency(models.Model):
currency_master = models.OneToOneField(CurrencyMaster, on_delete=models.RESTRICT)
conversion_rate = models.FloatField(null=False)
def __str__(self):
return self.currency_master.name
視圖.py,
class CurrencyViewSet(viewsets.ModelViewSet):
queryset = Currency.objects.all()
serializer_class = CurrencySerializer
lookup_field = 'id'
序列化程式.py,
class CurrencySerializer(serializers.ModelSerializer):
currency_master = serializers.CharField(source="currency_master.name")
class Meta:
model = Currency
fields = ['id', 'currency_master', 'conversion_rate']
當我發出發布請求時，我得到了像上面這樣的斷言錯誤，
class CurrencySerializer(serializers.ModelSerializer):
currency_master = serializers.CharField(source="currency_master.name")
class Meta:
model = Currency
fields = ['id', 'currency_master', 'conversion_rate']
def create(self, validated_data):
return Currency.objects.create(**validated_data)
def update(self, instance, validated_data):
instance.currency_master = validated_data.get('currency_master', instance.currency_master)
instance.conversion_rate = validated_data.get('conversion_rate', instance.conversion_rate)
return instance
我在上面試過我得到這個錯誤“ValueError：無法分配“{'name'：'ALL - Albania Lek'}”：“Currency.currency_master”必須是“CurrencyMaster”實體”。這個怎么解決？？？
uj5u.com熱心網友回復：
自定義create方法。
class CurrencySerializer(serializers.ModelSerializer):
currency_master = serializers.CharField(source="currency_master.name")
class Meta:
model = Currency
fields = ['id', 'currency_master', 'conversion_rate']
def create(self, validated_data):
currency_master_name = validated_data.pop('currency_master')["name"]
currency_master_obj = get_object_or_404(CurrencyMaster, name=currency_master_name)
validated_data["currency_master"] = currency_master_obj
return Currency.objects.create(**validated_data)
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