Fixed #11162 -- Mentioned ValidationError in custom model field docs
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@ -434,10 +434,14 @@ database, so we need to be able to process strings and ``Hand`` instances in
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p1 = re.compile('.{26}')
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p1 = re.compile('.{26}')
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p2 = re.compile('..')
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p2 = re.compile('..')
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args = [p2.findall(x) for x in p1.findall(value)]
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args = [p2.findall(x) for x in p1.findall(value)]
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if len(args) != 4:
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raise ValidationError("Invalid input for a Hand instance")
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return Hand(*args)
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return Hand(*args)
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Notice that we always return a ``Hand`` instance from this method. That's the
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Notice that we always return a ``Hand`` instance from this method. That's the
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Python object type we want to store in the model's attribute.
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Python object type we want to store in the model's attribute. If anything is
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going wrong during value conversion, you should return a
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:exc:`~django.core.exceptions.ValidationError` exception.
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**Remember:** If your custom field needs the :meth:`to_python` method to be
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**Remember:** If your custom field needs the :meth:`to_python` method to be
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called when it is created, you should be using `The SubfieldBase metaclass`_
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called when it is created, you should be using `The SubfieldBase metaclass`_
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