Allow empty strings on serializers

[Felipe Nogueira de Souza]

Hey guys, hope you're all good!

I'm having problems with the serialization of empty strings on DRF.

I have a model with two fields that are defined as blank = True and null = True, date and message.

models.py

class ContactUs(models.Model):
    email = models.CharField(_('email'), max_length=100)
    date = models.DateField(_('event date'), blank=True, null=True)
    message = models.CharField(_('message'), blank=True, null=True, max_length=2048)

In my serializer, I defined these fields as required = False and allow_null = True.

serializers.py

class ContactUsSerializer(serializers.ModelSerializer):
    message = serializers.CharField(required=False, allow_null=True)
    date = serializers.DateField(required=False, allow_null=True)

    class Meta:
        model = ContactUs
        fields = '__all__'

When the frontend does not send these fields or send them = null everything works 100%, however when it sends an empty string "" the serializer raises a validation error. I saw that I can handle this by defining to_internal_value (), but I think there may be a simpler way.

Does anyone have any other tips on how to solve this?

Shouldn't have an allow_empty=True option?

Thx,

Felipe

[Felipe Nogueira de Souza]

Searching for this I discovered that there is an option allow_blank that works fine to CharField, but not for DateField.

[sebastian wrzalek]

Hi, solution that comes to my mind is default value in your model fields.

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[Felipe Nogueira de Souza]

Hum, I don't know, since this validation is made on the serializer, so I don't know if a default value on the model would help, but I'll try your suggestion anyway. 

Thx

Em segunda-feira, 18 de maio de 2020 20:46:04 UTC-3, Felipe Nogueira de Souza escreveu: