Raise ValidationError on first failure.

[Doug Fultz]

Currently field validators are executed in order and any exceptions are collected before raising a single ValidationError for that field.
​https://github.com/django/django/blob/master/django/db/models/fields/__init__.py#L600

I have identified a use case where a validator may reach our to an external service or be very expensive to run, compared to other validators on the field. It would help increase performance and decrease load on other services if there was an option for field validation to fail on the first exception and prevent subsequent validators from being executed.

An example might be a validator that looks like

...
validators = [RegexValidator(r'\w'), ExpensiveExists]

Where the regex validator is fast and runs locally while ExpensiveExists calls out to an external service. In this case, we would want validation to fail on the regex and not call the expensive validation.

[Mariusz Felisiak]

Thanks for this ticket, however you use case is quite niche, IMO. You can always use a custom field and override run_validators().

[Adam Johnson]

It's also bad user experience to hide an error until others have been fixed. Django's run-them-all behaviour is the most user friendly.