Here follows my dirty solution I've created:
app_controller.php:
function _beforeScaffold($method) {
$this->_HABTM_scaffold_preserve($method);
return parent::_beforeScaffold($method);
}
function _HABTM_scaffold_preserve($method){
$model = $this->uses['0'];
if ($method == 'edit' && !empty($this->data ) && $model &&
!empty
($this->{$model}->hasAndBelongsToMany)){
foreach ($this->{$model}->hasAndBelongsToMany as
$HABTM_model =>
$dummy){
if
(isset($this->{$model}->hasAndBelongsToMany[$HABTM_model]
['with']) && $this->{$model}->hasAndBelongsToMany[$HABTM_model]
['with']){
$model_id_text =
$this->{$model}->hasAndBelongsToMany
[$HABTM_model]['foreignKey'];
$habtm_id_text =
$this->{$model}->hasAndBelongsToMany
[$HABTM_model]['associationForeignKey'];
$with_model =
$this->{$model}->hasAndBelongsToMany[$HABTM_model]
['with'];
if
(!empty($this->data[$HABTM_model][$HABTM_model])){
$this->log("app_controller.php/_HABTM_scaffold_preserve:
Preserving $model => $with_model", LOG_DEBUG);
$model_id =
$this->data[$model]['id'];
foreach
($this->data[$HABTM_model][$HABTM_model] as $k =>
$habtm_id){
$data =
$this->{$model}->{$with_model}->find( 'first',
array( 'conditions' =>
array($model_id_text =>
$model_id,
$habtm_id_text => $habtm_id
),
'contain' =>
array()
));
if ($data &&
isset($data[$with_model][$habtm_id_text]))
$this->data[$HABTM_model][$HABTM_model][$k] = $data
[$with_model];
}//foreach
}//if
}//if
}//foreach
}//if
}//_HABTM_scaffold_preserve
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