Model

class Residential extends CActiveRecord
{
	/**
	 * Returns the static model of the specified AR class.
	 * @param string $className active record class name.
	 * @return Residential the static model class
	 */
	public static function model($className=__CLASS__)
	{
		return parent::model($className);
	}

	/**
	 * @return string the associated database table name
	 */
	public function tableName()
	{
		return 'residential';
	}

	/**
	 * @return array validation rules for model attributes.
	 */
	public function rules()
	{
		// NOTE: you should only define rules for those attributes that
		// will receive user inputs.
		return array(
			//array('locationID, type, price_rangeID, description, active', 'required'),
			array('locationID,price_rangeID', 'my_required'),
			//array('artID, locationID, zip, size, lot, price_rangeID, active', 'numerical', 'integerOnly'=>true),
			array('type, state, price', 'length', 'max'=>10),
			array('name, street', 'length', 'max'=>100),
			array('city', 'length', 'max'=>25),
			array('feature', 'safe'),
			// The following rule is used by search().
			// Please remove those attributes that should not be searched.
			array('id, artID, locationID, type, name, street, city, state, zip, size, lot, price, price_rangeID, description, feature, active', 'safe', 'on'=>'search'),
		);
	}

	/**
	 * @return array relational rules.
	 */
	public function relations()
	{
		// NOTE: you may need to adjust the relation name and the related
		// class name for the relations automatically generated below.
		return array(
			'art' => array(self::BELONGS_TO, 'Art', 'artID'),
			'location' => array(self::BELONGS_TO, 'Location', 'locationID'),
			'priceRange' => array(self::BELONGS_TO, 'PriceRange', 'price_rangeID'),
		);
	}

	/**
	 * @return array customized attribute labels (name=>label)
	 */
	public function attributeLabels()
	{
		return array(
			'id' => 'ID',
			'artID' => 'Art',
			'locationID' => 'Location',
			'type' => 'Type',
			'name' => 'Name',
			'street' => 'Street',
			'city' => 'City',
			'state' => 'State',
			'zip' => 'Zip',
			'size' => 'Size',
			'lot' => 'Lot',
			'price' => 'Price',
			'price_rangeID' => 'Price Range',
			'description' => 'Description',
			'feature' => 'Feature',
			'active' => 'Active',
		);
	}

	/**
	 * Retrieves a list of models based on the current search/filter conditions.
	 * @return CActiveDataProvider the data provider that can return the models based on the search/filter conditions.
	 */
	public function search()
	{
		// Warning: Please modify the following code to remove attributes that
		// should not be searched.

		$criteria=new CDbCriteria;

		$criteria->compare('id',$this->id);
		$criteria->compare('artID',$this->artID);
		$criteria->compare('locationID',$this->locationID);
		$criteria->compare('type',$this->type,true);
		$criteria->compare('name',$this->name,true);
		$criteria->compare('street',$this->street,true);
		$criteria->compare('city',$this->city,true);
		$criteria->compare('state',$this->state,true);
		$criteria->compare('zip',$this->zip);
		$criteria->compare('size',$this->size);
		$criteria->compare('lot',$this->lot);
		$criteria->compare('price',$this->price,true);
		$criteria->compare('price_rangeID',$this->price_rangeID);
		$criteria->compare('description',$this->description,true);
		$criteria->compare('feature',$this->feature,true);
		$criteria->compare('active',$this->active);

		return new CActiveDataProvider($this, array(
			'criteria'=>$criteria,
		));
	}

	public function my_required($attribute_name, $params)
	{
	    if (empty($this->locationID)
	            && empty($this->price_rangeID)
	           // && empty($this->sizeID)
	    ) {
	        $this->locationID=-1;
	        //$this->price_rangeID=-1;
	        $this->addError($attribute_name, Yii::t('user', 'Please choose at least one option form either one or both list menus.'));

	        return false;
	    }

	    return true;
	}
}

Controller

	/**
	 * Show all active apartment listings.
	 */
	public function actionListings()
	{
		$model=new Residential;

		// Uncomment the following line if AJAX validation is needed
		//$this->performAjaxValidation($model);

		$condition='active=1';

		//if(Yii::app()->user->hasState('residential'))
			//$_POST['Residential']=Yii::app()->user->getState('residential');//get session variable

		if(isset($_POST['Residential'])){
			//Yii::app()->user->setState('residential',$_POST['Residential']);//save session variable
			$model->attributes=$_POST['Residential'];
			if (strlen($model->locationID>0))
				$condition='locationID='.$model->locationID.' AND '.$condition;
			if (strlen($model->price_rangeID>0))
				$condition='price_rangeID='.$model->price_rangeID.' AND '.$condition;
			$dataProvider=new CActiveDataProvider('Residential', array(
				'criteria'=>array(
					'condition'=>$condition,
					'order'=>'locationID ASC,price ASC',
				),
				'pagination'=>array(
			       'pageSize'=>5,
			    ),
			));
			if($model->save()){
				$this->render('listings',array(
					'model'=>$model,
					'dataProvider'=>$dataProvider,
				));
				exit;

			}
		}else{
			$dataProvider=new CActiveDataProvider('Residential', array(
				'criteria'=>array(
					'condition'=>$condition,
					'order'=>'locationID ASC,price ASC',
				),
				'pagination'=>array(
			        'pageSize'=>5,
			    ),
			));
		}

		$this->render('listings',array(
			'model'=>$model,
			'dataProvider'=>$dataProvider,
		));
	}

View

<?php $this->widget('zii.widgets.CListView', array(
	'dataProvider'=>$dataProvider,
	'itemView'=>'_listingsResults',
	'emptyText'=>$emptyText,
	'summaryText'=>"{count} Listings",
	'template'=>"{pager}\n{items}\n{pager}",
	'pager'=> array(
		'cssFile'=>false,
		'header'=>'',
		'firstPageLabel' => '&lt;&lt;&nbsp;First',
		'prevPageLabel'  => '&lt;&nbsp;Back',
		'nextPageLabel'  => 'Next&nbsp;&gt;',
		'lastPageLabel'  => 'Last&nbsp;&gt;&gt;',
	),
	'afterAjaxUpdate'=>'js:function(id, data) {a[rel^=\'prettyPhoto\']").prettyPhoto();}',
)); ?>