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Data Model Questions

ModelAdmin saves twice on adding?


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3 Posts   917 Views

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theAlien

25 January 2010 at 1:34pm (Last edited: 25 January 2010 1:35pm), Community Member, 131 Posts

Hi,

I have a DataObject (A) in ModelAdmin that's supposed to save data to a record on another DataObject (B) in an onBeforWrite-method.
But if I'm adding a new DataObjectA, it doesn't save to one record, but to two records on DataObjectB...

Does someone know what's happening here and how to solve this?
Below is the structure:

class DataObjectA extends DataObject{

static $db = array(
"titleA" => "Varchar",
);

static $has_many = array(
"DataObjectB" => "DataObjectB",
);

public function onBeforeWrite() {

$myDataObjectB = new DataObjectB();
$myDataObjectB->titleB = "NewTitle";
$myDataObjectB->write();

parent::onBeforeWrite();

}


class DataObjectB extends DataObject{

static $db = array(
"titleB" => "Varchar",
);

static $has_one = array(
"DataObjectA" => "DataObjectA"
);

}

BTW If DataObjectA exists and you click save, it will save just one new record on DataObjectB

Avatar
Hamish

26 January 2010 at 12:47pm Community Member, 712 Posts

For a new record there are two operations - a 'create' and an 'update'. That is, onBeforeWrite will be called twice. The first time, the ID will be 0, so you can use that to figure out what operation is happening.

Basically, if you wrap your code in "if($this->ID) { ... }" it should fix your problem.

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theAlien

26 January 2010 at 1:44pm Community Member, 131 Posts

thanks, works like a charm