how to get value from previous view in Yii - php

Question

I'm not sure how to describe my question. First I added a button at my CCGridview:
array(
'class'=>'CButtonColumn',
'template' => '{view}{update}{delete}{upload_image}',
'buttons' => array(
'upload_image' => array(
'label' => 'upload foto',
'url' => 'Yii::app()->createUrl("/image/create",
array("product_id" => $data->product_id))',
),
),
),
when I clicked it will bring me to the /image/create view which has a product_id value. For example on that gridview I clicked record number 7, so the url would be:
(webApp)/index.php/image/create?product_id=7
Since it rendering a partial _form so the form has the attribute according to the image table which has this attributes: id, title, filename, product_id.
So the view will be something like:
<div class="row">
<?php echo $form->labelEx($model,'title'); ?>
<?php echo $form->textField($model,'title',array('size'=>45,'maxlength'=>45)); ?>
<?php echo $form->error($model,'title'); ?>
</div>
<div class="row">
<?php echo $form->labelEx($model,'filename'); ?>
<?php echo $form->fileField($model,'filename',array('size'=>45,'maxlength'=>45)); ?>
<?php echo $form->error($model,'filename'); ?>
</div>
<div class="row">
<?php echo $form->labelEx($model,'product_id'); ?>
<?php echo $form->textField($model,'product_id'); ?>
<?php echo $form->error($model,'product_id'); ?>
</div>
<div class="row buttons">
<?php echo CHtml::submitButton($model->isNewRecord ? 'Create' : 'Save'); ?>
</div>
My question is, how do we use the value from the url which I mentioned before is 7 (../create?product_id=7) into the product_id attribute without have to type it at provided textField?
In other word I will remove this from the view:
<div class="row">
<?php echo $form->labelEx($model,'product_id'); ?>
<?php echo $form->textField($model,'product_id'); ?>
<?php echo $form->error($model,'product_id'); ?>
</div>
But when i submitted, the form the value (7) should have been passed/saved at product_id field.
Added:
My controller actionCreate is
//...
public function actionCreate()
{
$dir = Yii::app()->basePath . '/../productimages/';
$uploaded = false;
$model=new Image();
if(isset($_POST['Image']))
{
$model->attributes=$_POST['Image'];
$tempSave=CUploadedFile::getInstance($model,'filename');
if($model->validate())
{
$uploaded = $tempSave->saveAs($dir.'/'.$tempSave->getName());
$this->redirect(array('/products/index'));
}
}
$this->render('index', array(
'model' => $model,
'uploaded' => $uploaded,
'dir' => $dir,
));
}
That's it. Many thanks..

Answer 1

modify your controller this way:
if(isset($_POST['Image']))
{
$model->attributes=$_POST['Image'];
$tempSave=CUploadedFile::getInstance($model,'filename');
if($model->validate())
{
$uploaded = $tempSave->saveAs($dir.'/'.$tempSave->getName());
$this->redirect(array('/products/index'));
}
} else {
//initialize defaults
$model->product_id=intval($_GET['product_id']);
}