Cosmetic
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@ -310,7 +310,7 @@ Dealing with deletion of referred documents
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By default, MongoDB doesn't check the integrity of your data, so deleting
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documents that other documents still hold references to will lead to consistency
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issues. Mongoengine's :class:`ReferenceField` adds some functionality to
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safeguard against these kinds of database integrit2y problems, providing each
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safeguard against these kinds of database integrity problems, providing each
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reference with a delete rule specification. A delete rule is specified by
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supplying the :attr:`reverse_delete_rule` attributes on the
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:class:`ReferenceField` definition, like this::
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