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DOC Clarify DataObject->update() use
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@ -947,9 +947,12 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
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* The field names can be simple names, or you can use a dot syntax to access $has_one relations.
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* For example, array("Author.FirstName" => "Jim") will set $this->Author()->FirstName to "Jim".
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*
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* update() doesn't write the main object, but if you use the dot syntax, it will write()
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* Doesn't write the main object, but if you use the dot syntax, it will write()
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* the related objects that it alters.
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*
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* When using this method with user supplied data, it's very important to
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* whitelist the allowed keys.
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*
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* @param array $data A map of field name to data values to update.
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* @return DataObject $this
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*/
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