Customised query to display in CGridView in yii - yii-extensions

Question

Controller,
$model=Product::model()->display_products_statistics();
$this->render('admin',array(
'model'=>$model,
));
View,
$this->widget('zii.widgets.grid.CGridView', array(
'id' => 'product-grid',
'dataProvider' => $model->display_products_statistics(),
'filter'=> $model,
'columns'=> array(
'member_count',
'seller_count',
'visitor_count',
'lowest price',
'desc',
'price',
'createdate',
'updatedate',
'opid',
'pimg',
array(
'class'=>'CButtonColumn',
),
),
));
Model,
$sql="select member_count,seller_count,
visitor_count from fc_product fp
group by member_count,visitor_count,seller_count
order by member_count desc";
$connection=Yii::app()->db;
$command=$connection->createCommand($sql);
$products_statistics=$command->queryAll();
$dataprovider=new CArrayDataProvider($products_statistics,
array('pagination'=>false));
return $dataprovider->getData();
But then I am getting this error
Fatal error: Call to a member function getData() on a non-object in D:\wamp\www\yii\framework\zii\widgets\CBaseListView.php on line 111
I am confused and don't know what's going wrong.

Answer 1

Your problem is that you are not using CDataProvider in the correct way. CGridView needs an instance of CDataProvider to display, but you have used CDataProvider->getData() instead. I'd also recommend using CSqlDataProvider, which is purpose made for custom sql queries. Try this in your model;
$count = Yii::app()->db->createCommand('SELECT COUNT(*) FROM fc_product')->queryScalar();
$sql="select member_count,seller_count,
visitor_count from fc_product fp
group by member_count,visitor_count,seller_count
order by member_count desc";
return new CSqlDataProvider($sql, array(
'totalItemCount' => $count,
'sort' => array(
'attributes' => array(
'member_count', 'visitor_count', 'seller_count',
),
),
'pagination' => false