看起来 Model hook Before Delete 无法分层工作。让我用例子来解释。
class Model_User extends Model_Table{
public $table='user';
function init(){
parent::init();
$this->debug();
$this->addField('name');
$this->hasMany('Item');
$this->addHook('beforeDelete',$this);
}
function beforeDelete($m){
$m->ref('Item')->deleteAll();
}
}
class Model_Item extends Model_Table{
public $table='item';
function init(){
parent::init();
$this->debug();
$this->addField('name');
$this->hasOne('User');
$this->hasMany('Details');
$this->addHook('beforeDelete',$this);
}
function beforeDelete($m){
$m->ref('Details')->deleteAll();
}
}
class Model_Details extends Model_Table{
public $table='details';
function init(){
parent::init();
$this->debug();
$this->addField('name');
$this->hasOne('Item');
}
}
当我在"祖父"Model_User上调用 delete（） 时，它会尝试按预期删除所有项目记录，但从那里不要执行 Item.beforeDelete 钩子，并且在尝试删除 Item 之前不要删除详细信息记录。
我做错了什么？
我想我至少让它适用于分层模型结构。
它是这样完成的：
class Model_Object extends hierarchy'Model_Hierarchy {
public $table = 'object';
function init(){
parent::init();
$this->debug(); // for debugging
$this->addField('name');
$this->addHook('beforeDelete',$this);
}
function beforeDelete($m) {
// === This is how you can throw exception if there is at least one child record ===
// if($m->ref('Object')->count()->getOne()) throw $this->exception('Have child records!');
// === This is how you can delete child records, but use this only if you're sure that there are no child/child records ===
// $m->ref('Object')->deleteAll();
// === This is how you can delete all child records including child/child records (hierarcialy) ===
// Should use loop if we're not sure if there will be child/child records
// We have to use newInstance, otherwise we travel away from $m and can't "get back to parent" when needed
$c = $m->newInstance()->load($m->id)->ref('Object');
// maybe $c = $m->newInstance()->loadBy('parent_id',$m->id); will work too?
foreach($c as $junk){
$c->delete();
}
return $this;
}
}
这里的重要事项是：
* 扩展层次结构''Model_Hierarchy类不Model_Table
* 在删除钩子
之前使用适当的方法* *如果我们有孩子，限制删除 - 抛出异常
* * 全部删除 - 当您确定没有子/子记录
时使用它* * newInstance + 循环 + 删除 - 当您必须分层删除记录（甚至是子/子/...）时使用它
也许你们中的一些人有更好的解决方案？