Validate each value of an ArrayField of emails in Django - django

Question

I am using PostgreSQL with Django and am trying to use ArrayField(models.EmailField(max_length=200)). But I am ending up with an 500 error code(TypeError) when giving invalid email address.
How can I validate each email in the ArrayField. I have tried writing validate method in both serializer and models. But nothing helped. What is the right way to validate ArrayFields? I am using Django 2.1 and Python 3.6
The traceback of the error is given below...please have a look
models.py
billing_emails = ArrayField(models.EmailField(max_length=200))
company = models.OneToOneField(Company, on_delete=models.CASCADE)
Traceback
Traceback (most recent call last):
File "/home/user/.local/share/virtualenvs/backend-Amy45Zrz/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/home/user/.local/share/virtualenvs/backend-Amy45Zrz/lib/python3.6/site-packages/django/core/handlers/base.py", line 156, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/home/user/.local/share/virtualenvs/backend-Amy45Zrz/lib/python3.6/site-packages/django/core/handlers/base.py", line 154, in _get_response
response = response.render()
File "/home/user/.local/share/virtualenvs/backend-Amy45Zrz/lib/python3.6/site-packages/django/template/response.py", line 106, in render
self.content = self.rendered_content
File "/home/user/.local/share/virtualenvs/backend-Amy45Zrz/lib/python3.6/site-packages/rest_framework/response.py", line 72, in rendered_content
ret = renderer.render(self.data, accepted_media_type, context)
File "/home/user/.local/share/virtualenvs/backend-Amy45Zrz/lib/python3.6/site-packages/djangorestframework_camel_case/render.py", line 8, in render
return super(CamelCaseJSONRenderer, self).render(camelize(data), *args,
File "/home/user/.local/share/virtualenvs/backend-Amy45Zrz/lib/python3.6/site-packages/djangorestframework_camel_case/util.py", line 17, in camelize
new_dict[new_key] = camelize(value)
File "/home/user/.local/share/virtualenvs/backend-Amy45Zrz/lib/python3.6/site-packages/djangorestframework_camel_case/util.py", line 16, in camelize
new_key = re.sub(r"[a-z]_[a-z]", underscoreToCamel, key)
File "/home/user/.local/share/virtualenvs/backend-Amy45Zrz/lib/python3.6/re.py", line 191, in sub
return _compile(pattern, flags).sub(repl, string, count)
TypeError: expected string or bytes-like object
Thanks in advance.

Answer 1

If you are using Forms, use Form or Serializer, you can use the clean_<attribute_name> method to validate the data. For example:
from django.core.validators import email_re
from django.core.exceptions import ValidationError
class YourForm(forms.ModelForm): # serializers.ModelSerializer
def clean_billing_emails(self):
data = self.cleaned_data['billing_emails']
for email in data:
if not email_re.match(email):
raise ValidationError('Invalid email {}'.format(email) # or raise serializers.ValidationError
return data
Also you can use model's clean method.
class YourModel(models.Model):
...
def clean(self):
try:
for email in self.billing_emails:
if not email_re.match(email):
raise ValidationError('Invalid email {}'.format(email)
except (TypeError, Exception) as e:
# log error
# handle error
def save(self, *args, **kwargs):
self.full_clean()
return super(YourModel, self).save(*args, **kwargs)