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Expand on model validation via constraints

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- New good stuff coming from Django 4.1
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Radoslav Georgiev 2022-11-02 14:51:01 +02:00
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@ -306,7 +306,15 @@ class Course(BaseModel):
Now, if we try to create new object via `course.save()` or via `Course.objects.create(...)`, we are going to get an `IntegrityError`, rather than a `ValidationError`.
This can actually be a downside to the approach, because now, we have to deal with the `IntegrityError`, which does not always have the best error message.
This can actually be a downside (_this is not the case, starting from Django 4.1. Check the extra section below._) to the approach, because now, we have to deal with the `IntegrityError`, which does not always have the best error message.
> 👀 ⚠️ 👀 Since Django 4.1, calling `.full_clean` will also check model constraints!
>
> This actually removes the downside, mentioned above, since you'll get a nice `ValidationError`, if your model constraints fail the check (if you go thru `Model.objects.create(...)` the downside still holds)
>
> More on this, here - <https://docs.djangoproject.com/en/4.1/ref/models/instances/#validating-objects>
>
> For an example test case, check the Styleguide-Example repo - <https://github.com/HackSoftware/Django-Styleguide-Example/blob/master/styleguide_example/common/tests/models/test_random_model.py#L12>
The Django's documentation on constraints is quite lean, so you can check the following articles by Adam Johnson, for examples of how to use them: