How to use Yii CArrayDataProvider - yii

Question

I am new to php and Yii and need some help regarding showing array in the webpage.
In the controller I open my e-mail inbox and iterate through the e-mails in inbox and build array with each e-mail address as key having values
if (array_key_exists($fromemail,$senders))
{ $senders[$fromemail]['rcount']++; }
else {
$senders[$fromemail]['e-mail'] = $fromemail;
$senders[$fromemail]['Name'] = $fromname;
$senders[$fromemail]['rcount'] = 1;
}
$model->top_senders = $senders;
$this->render('Step2',array('model'=>$model,));
Then in the view file of Step2 I want to show the data in CGridview
if (isset($model->top_senders))
{
$gridDataProvider = new CArrayDataProvider($model->top_senders);
$gridDataProvider->setData($model->top_senders);
$gridColumns = array(
array('name'=>'e-mail', 'header'=>'E-mail','value' =>'$data->e-mail'),
array('name'=>'rcount', 'header'=>'# of mails','value'=>'$data->rcount'),);
$this->widget('bootstrap.widgets.TbGridView',array('dataProvider' => $gridDataProvider,'template' => "{items}",'columns'=>$gridColumns));
}
But I will get error during rendering of the table: PHP notice Undefined offset: 0
/**
125 * Renders a data cell.
126 * #param integer $row the row number (zero-based)
127 */
128 public function renderDataCell($row)
129 {
130 $data=$this->grid->dataProvider->data[$row];
What I am doing wrong? Can anyone help me?

Answer 1

You should't add data to provider as follows:
$gridDataProvider->setData($model->top_senders);
It added during initialization. You must be sure that the array has a key id, otherwise you need to specify it manually (it must be unique) as follows:
$gridDataProvider = new CArrayDataProvider($model->top_senders, array(
'id'=>'Name',
));
You will also need to make sure that the array $model->top_senders has the following structure:
array(
'0'=>array(...user data here),
'1'=>array(...user data here),
...
);

Answer 2

If you var_dump($gridDataProvider->data) you'd notice there's no value for the 0th index in the array. This happens when you run some filter function on the array. Assuming there are 5 values in the filtered array, the filtered array would look something like this when var_dump'd.
array(5) {
[1] => Object (Mailer) {…},
[2] => Object (Mailer) {…},
[4] => Object (Mailer) {…},
[8] => Object (Mailer) {…},
[9] => Object (Mailer) {…},
}
A filter operation on an array can leave the array looking like the above.
When the CGridView is trying to feed the view with data, it does it sequentially—this, I find, is a shortcoming in Yii and should be raised as an issue.
In order to fix this, use PHP's array_values() like so…
$properly_indexed_array = array_values($filtered_array);
This will copy the values of the filtered array into a new array. This is not the optimal solution in terms of memory. So far, I do not see any means in PHP other than this though.
You may then go ahead and set this as the data for your data provider like so…
$gridDataProvider->setData($properly_indexed_array);