验证不适用于序列化程序方法字段

Question

我正在我的Django DRF应用程序工作。我有两个模型Organization和BankAccount

class Organization(models.Model):
...
class BankAccount(models.Model):
is_main = models.BooleanField(default=False) # organization should have 1 main account
organization = models.ForeignKey(
Organization,
related_name="accounts",
on_delete=models.CASCADE,
)
...

我想验证组织数据

组织必须至少有一个is_main=True的帐户

但是我的验证不起作用(看起来没有validate_accountscal .

class OrganizationSerializer(serializers.ModelSerializer):
accounts = serializers.SerializerMethodField()

class Meta:
model = Organization
fields = '__all__'
read_only_fields = ("id",)

def get_accounts(self, obj):
if obj.accounts is not None:
return BankAccountSerializer(obj.accounts, many=True).data
return None

def validate_accounts(self, value):
"""
Organization should have account with 'is_main' true
"""
raise ValueError(value) # Don't see exception in logs
if not value:
return value

for account in value: # check all accounts
if account["is_main"] == True:
return value
raise serializers.ValidationError("Organization should have main account  (is_main=true)")

示例:对于这个数据，我期望验证错误:(只有一个带有"is_main": false，)

"accounts": [
{
"id": 1,
"is_main": false,
"bank_name": "Sber",
"bank_bik": "123",
"bank_account": "123",
"correspondent_account": "312",
"organization": 3
},
]

Answer 1

如文档中所述https://www.django-rest-framework.org/api-guide/fields/serializermethodfield

验证不起作用，因为methodfield是只读字段。

Answer 2

我的解决方案

def get_accounts(self, obj):
if obj.accounts is not None:
return self.validate_accounts(
BankAccountSerializer(obj.accounts, many=True).data
)
return None
def validate_accounts(self, value):
"""
Organization should have account with 'is_main' true
"""
if not value:
return value

for account in value: # caheck all accounts
if account["is_main"] == True:
return value
raise serializers.ValidationError("Organization should have main account  (is_main=true)")