I am working on my Django DRF app. I have two models Organization and 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,
)
...
I want to validate Organization data
Organization must have at least one account with is_main=True
but my validation isn’t working (it looks like there are no validate_accounts cals.
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)")
Example: For this data I expect validation error: (only one acc with "is_main": false,)
"accounts": [
{
"id": 1,
"is_main": false,
"bank_name": "Sber",
"bank_bik": "123",
"bank_account": "123",
"correspondent_account": "312",
"organization": 3
},
]
>Solution :
as described in documentation
https://www.django-rest-framework.org/api-guide/fields/#serializermethodfield
validation is not working on methodfield because methodfield is read-only field.