How to override model field validation in django rest framework ModelSerializer

Question

I have the following model:

class UserProfile(models.Model):
    mobileNumber = models.BigIntegerField(primary_key=True)
    authKey = models.CharField(max_length=300,null=False,blank=False)
    creationDateTime = models.DateTimeField(auto_now_add=True)
    lastUpdateDateTime = models.DateTimeField(auto_now=True)

Serializer:

class UserProfileSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserProfile
        fields = ('mobileNumber','authKey')

If userprofile model already has a mobilenumber XX44 and if I try to serialize using UserProfileSerializer with json {'mobileNumber': XX44, 'authKey': u'ggsdsagldaslhdkjashdjkashdjkahsdkjah'} I'm getting the following error:

{'mobileNumber': [u'User profile with this MobileNumber already exists.']}

because model validations are being run for the serializer field.

How can I stop execution of model field validation for mobileNumber. I have tried validate and validate_mobileNumber methods in serializer but they still are executing the model validations.

The data you are trying to serialize {'mobileNumber':XX44.....} Is it some random data or data of UserProfile model? Because if it is random unvalidated data then you should not use model serializer to serialize it, just use a normal serializer. — theguru42
– theguru42, Commented Mar 25, 2014 at 18:25

Baby Groot · Accepted Answer · 2014-05-14 06:34:17Z

2

remove unique constraint on mobile number of table,so django serializer will validate according to that .

or alternatively,

   serializer=UserProfileSerializer(data=request.DATA,partial=True)

edited May 14, 2014 at 6:34

Baby Groot

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answered May 14, 2014 at 6:12

user3635290

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Comments

Danilo Freitas · Accepted Answer · 2016-01-05 21:30:53Z

0

I understand you won't save the serializer data. So, you can set mobileNumber as a read_only field on UserProfileSerializer.

Check serializer fields documentation for more info: http://www.django-rest-framework.org/api-guide/fields/#core-arguments

answered Jan 5, 2016 at 21:30

Danilo Freitas

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Comments

jmunsch · Accepted Answer · 2019-10-01 23:03:03Z

By overriding the model field within the serializer, and specifying required=False, allow_blank=True, allow_null=True:

class SomeModel(models.Model):
   some_model_field_which_is_required = models.ForeignKey(...)
   some_other_required_field = models.CharField(...)

class SomeModelSerializer(serializers.ModelSerializer):
    some_model_field_which_is_required = SomeNestedSerializer(
        many=True, required=False, allow_blank=True
    )
    some_other_required_field = serializers.CharField(required=False, allow_blank=True)

   def validate(self, *args, **kwargs):
       print('should get here')

   def validate_some_other_required_field(self, *args, **kwargs):
       print('should also get here')

    class Meta:
        model = SomeModel

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