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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