Cannot override choices error_messages in model

[Suneeth S]

I have a model class (from django.db.model) and a char field with choices attribute, my form is not created from django form and i am using a serializer in the middle of the model and my static HTML form when validating my choices field (dropdown) it shows the default validation messages only, i couldn't override the error messages. Thanks in advance.

here is my code

class CustomUser(BaseModel, AbstractUser):

type = models.CharField(choices=TYPES, max_length=20, default='super_admin',error_messages={"null":'Value is not a valid.',"blank":'Value is not a valid.',"invalid_choice":'Value is not a valid.'})

note: Base model inherited from models.Model

[Suneeth S]

Sorry, I have fixed the issue in serializer like this,
extra_kwargs = {"type": {"error_messages": {"null": "Value cannot be null"}}}