gistfile1.py

# Django
#
# Calling MyModel.create() raises CustomError even if the caller catches it
# Built-in exceptions works fine, which can be tested easily with:
#     CustomError = Exception

from django.db import models


class CustomError(Exception):
    pass


class MyModel(models.Model):
    name = models.CharField(max_length=255)
    
    @staticmethod
    def create():
        raise CustomError