I have a model with a JSONField
.
model.py
class Categories(models.Model):
type = models.CharField(max_length=20)
name = models.CharField(max_length=500)
details = JSONField(blank=True, null=True)
Currently I'm using serializers.ModelSerializer
for serializing this above model:
serializers.py
class CategoriesSerializer(serializers.ModelSerializer):
class Meta:
model = Categories
fields = ('id', 'type', 'name', 'details')
Due to this, the details field is only checked to contain valid json
. What i really need to do is to perform some custom validation based on the Json Schema defined for details field. However since I don't want any other custom validations for rest of the fields, I would like to keep using the validations provided by serializers.ModelSerializer
. Is there any way I can override a validation for just one field, probably by writing a custom serializer for just the details field?
Note question is not about how to write a custom Validator, but about how to use that custom validator on a field in the serializer inheriting
ModelSerializer
DRF's serializers provide field level validation option. You can perform details field validation by implementing validate_details
method:
class CategoriesSerializer(serializers.ModelSerializer):
class Meta:
model = Categories
fields = ('id', 'type', 'name', 'details')
def validate_details(self, value):
if value['not_valid']:
raise serializers.ValidationError("Not valid")
return value