How to tell, if a DataObject is already written to DB
Sometimes you want to check, if you're DataObject is still a new object or already written to DB, e..g in your onBeforeWrite() method. You can either check
if($this->ID) {
//written to DB, do stuff
}
or use DataObject's isInDB()
if($this->isInDB()) {
//do something
}
which does basically the same but more elegant and makes your code more self descriptive.
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