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Fixed #22959 -- Documented that class-based validators need to be deconstructible.
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@ -37,6 +37,14 @@ use the same validator with forms::
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class MyForm(forms.Form):
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even_field = forms.IntegerField(validators=[validate_even])
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You can also use a class with a ``__call__()`` method for more complex or
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configurable validators. :class:`RegexValidator`, for example, uses this
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technique. If a class-based validator is used in the
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:attr:`~django.db.models.Field.validators` model field option, you should make
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sure it is :ref:`serializable by the migration framework
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<migration-serializing>` by adding :ref:`deconstruct()
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<custom-deconstruct-method>` and ``__eq__()`` methods.
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How validators are run
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======================
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