Customizable error messages

[ffigiel]

Currently the errors have fixed messages. Sometimes we might want to include specific details based on the input data, or received from a third-party library

[ffigiel]

Here's a util I came up with to handle this case

def detailed_error(instance, message):
    return type(instance)(message, error_code=instance.error_code, errors=instance.errors)

Simplified use case

from django.contrib.auth.password_validation import validate_password
from django.core.exceptions import ValidationError


class Error(LogicErrors):
    WEAK_PASSWORD = InvalidOperationException('This password is too weak.')


@validator
def can_use_password(new_password):
    try:
        validate_password(new_password)
    except ValidationError as e:
        raise detailed_error(Error.WEAK_PASSWORD, str(e))

This is how you test it

def test_cannot_use_weak_password(self):
    result = services.can_use_password('123456', raise_exception=False)
    assert result.error.error_code == services.Error.WEAK_PASSWORD.error_code

[Valian]

@megapctr It's solved in the newest version, should be published to pip very soon. You can find more details here 3108b05. Your approach was a bit hacky, so I came up with this:

exc = LogicException('User {user} is way too young!', error_code='TOO_YOUNG')
formatted_exc = exc.format(user='Bob')
assert str(formatted_exc) == 'User Bob is way too young!'
assert exc.error_code == formatted_exc.error_code
assert exc == formatted_exc

Moreover, if you would try to raise parametrizable LogicException without calling .format() from a validator, you'll get Assertion error with a helpful information. Hope this will help you, sorry for waiting so long!