parent form with multiple inputs child form - yii

Question

how do i save multiple rows in child without using any extensions?
Within parent form I have a child form, user just input whatever row is needed. Right now it only saves the first row.
controller:
//some parent stuff form here
$valid = true;
$arrAttrData = array();
if($model->save()){
if(isset($_POST['ProductAttribute'])){
foreach($_POST['ProductAttribute'] as $i=>$attrItem){
$attr = new ProductAttribute;
$attr->attributes = $attrItem;
if ( $model->product_id )
$attr->product_id = $model->product_id;
if ( ! $attr->validate() )
$valid = false;
else $arrAttrData[] = $attr;
}
}
if ( $valid ){
foreach( $arrAttrData as $attr ){
$attr->product_id = $model->product_id;
$attr->save();
}
}
}
parent:
//some parent stuff here
<div id="attribute">
<?php
$this->renderPartial('_attr', array(
'attr' => $attr,
));?>
</div>
_attr:
<?php $form=$this->beginWidget('bootstrap.widgets.TbActiveForm', array(
'id'=>'attr-form',
'htmlOptions'=>array('enctype'=>'multipart/form-data'),
)); ?>
<?php echo $form->errorSummary($attr); ?>
<table>
<tbody>
<tr>
<td>Attribute's Name</td><td>Attribute Price</td><td>Description</td>
</tr>
<?php for ($i=0;$i<5;$i++):?>
<tr>
<td><?php echo CHtml::activeTextField($attr,'[$i]name',array('class'=>'span12','placeholder'=>'Red or X-Small')); ?></td>
<td><?php echo CHtml::activeTextField($attr,'[$i]cost',array('class'=>'span4','placeholder'=>'89.99')); ?></td>
<td><?php echo CHtml::activeTextField($attr,'[$i]description',array('class'=>'span12','placeholder'=>'Spicy Red Thingy')); ?></td>
</tr>
<?php endfor?>
<br>
<?php echo CHtml::error($attr, '[$i]name'); ?>
<?php echo CHtml::error($attr, '[$i]cost'); ?>
<?php echo CHtml::error($attr, '[$i]description'); ?>
</tbody>
</table>
<?php $this->endWidget(); ?>
[edit]:
form html view
<table>
<tbody>
<tr>
<td>Attribute's Name</td><td>Attribute Price</td><td>Description</td>
</tr>
<tr>
<td><input class="span12" placeholder="Red or X-Small" name="ProductAttribute[$i][name]" id="ProductAttribute_$i_name" type="text" maxlength="155"></td>
<td><input class="span4" placeholder="89.99" name="ProductAttribute[$i][cost]" id="ProductAttribute_$i_cost" type="text"></td>
<td><input class="span12" placeholder="Spicy Red Thingy" name="ProductAttribute[$i][description]" id="ProductAttribute_$i_description" type="text" maxlength="155"></td>
</tr>
<tr>
<td><input class="span12" placeholder="Red or X-Small" name="ProductAttribute[$i][name]" id="ProductAttribute_$i_name" type="text" maxlength="155"></td>
<td><input class="span4" placeholder="89.99" name="ProductAttribute[$i][cost]" id="ProductAttribute_$i_cost" type="text"></td>
<td><input class="span12" placeholder="Spicy Red Thingy" name="ProductAttribute[$i][description]" id="ProductAttribute_$i_description" type="text" maxlength="155"></td>
</tr>
<tr>
<td><input class="span12" placeholder="Red or X-Small" name="ProductAttribute[$i][name]" id="ProductAttribute_$i_name" type="text" maxlength="155"></td>
<td><input class="span4" placeholder="89.99" name="ProductAttribute[$i][cost]" id="ProductAttribute_$i_cost" type="text"></td>
<td><input class="span12" placeholder="Spicy Red Thingy" name="ProductAttribute[$i][description]" id="ProductAttribute_$i_description" type="text" maxlength="155"></td>
</tr>
<tr>
<td><input class="span12" placeholder="Red or X-Small" name="ProductAttribute[$i][name]" id="ProductAttribute_$i_name" type="text" maxlength="155"></td>
<td><input class="span4" placeholder="89.99" name="ProductAttribute[$i][cost]" id="ProductAttribute_$i_cost" type="text"></td>
<td><input class="span12" placeholder="Spicy Red Thingy" name="ProductAttribute[$i][description]" id="ProductAttribute_$i_description" type="text" maxlength="155"></td>
</tr>
<tr>
<td><input class="span12" placeholder="Red or X-Small" name="ProductAttribute[$i][name]" id="ProductAttribute_$i_name" type="text" maxlength="155"></td>
<td><input class="span4" placeholder="89.99" name="ProductAttribute[$i][cost]" id="ProductAttribute_$i_cost" type="text"></td>
<td><input class="span12" placeholder="Spicy Red Thingy" name="ProductAttribute[$i][description]" id="ProductAttribute_$i_description" type="text" maxlength="155"></td>
</tr>
</tbody>
</table>

Answer 1

In your controller , try this
if($model->save()){
if(isset($_POST['ProductAttribute'])){
foreach($_POST['ProductAttribute'] as $i=>$attrItem){
$attr = new ProductAttribute;
$attr->attributes = $attrItem;
if ( $model->product_id )
$attr->product_id = $model->product_id;
if ($attr->validate() )
$attr->save();
}
}
unset($attr);
} // foreach
}