I have the following model:
class PersonDiscount(models.Model):
user = models.OneToOneField('backend.Customer', related_name='discount', on_delete=models.CASCADE, error_messages={
'unique': _('A discount setting is already set up for this customer.')})
discount = models.IntegerField(default=0)
discount_auto = models.IntegerField(default=0)
auto = models.BooleanField(default=True)
class Meta:
ordering = ['-id']
And a following serializer for the model:
class PersonDiscountPostSerializer(serializers.ModelSerializer):
class Meta:
model = PersonDiscount
fields = '__all__'
extra_kwargs = {
'user': {
'error_messages': {
'unique': _('A discount setting is already set up for this customer.')
}
}
}
When i tried to create a PersonDiscount instance with existed user from the api i'm not getting the custom error message which i set in both model and serializer.
{
"user": [
"This field must be unique."
]
}
I had already looked up in the docs and can't find any other way to understand why the override error_messages not getting applied. I also restarted the django runserver several times already
Hope someone can help me with this problem
You can validate uniqueness manually as below:
class PersonDiscountPostSerializer(serializers.ModelSerializer):
user = serializers.PrimaryKeyRelatedField(
required=True,
queryset=Customer.objects.all(),
)
def validate_user(self, value):
exists = PersonDiscount.objects.filter(user=value).exists()
if exists:
raise serializers.ValidationError("err msg")
return value
class Meta:
model = PersonDiscount
fields = '__all__'