Yii. How to make a custom filter in CGridView?

Question

Yii

How to make the filter according to the data different in structure from the model?
dataProvider - receives data using the Purchase::getInfoAllUser() function.
Normally filter is equal to $model , but in this case the fields of the model are not equal to the fields to be displayed (some calculations are done before the output). What exactly needs to be fed in filter ?

$this->widget('zii.widgets.grid.CGridView', array(
    'dataProvider' => Purchase::getInfoAllUser(),
    'filter' => ??????,
    'columns' => array(
            array('name' => 'id', 'filter' => false),
            array('name' => 'user', 'filter' => Purchase::getInfoAllUser()),
            array('name' => 'summary_cost', 'filter' => false),
        )
));

Answer 1

You need to edit Purchase::getInfoAllUser, set up a filter in the code there.