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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\data;
use Yii;
use yii\base\InvalidConfigException;
use yii\base\Model;
use yii\db\Query;
use yii\db\ActiveQuery;
use yii\db\Connection;
/**
* ActiveDataProvider implements a data provider based on [[Query]] and [[ActiveQuery]].
*
* ActiveDataProvider provides data by performing DB queries using [[query]].
*
* The following is an example of using ActiveDataProvider to provide ActiveRecord instances:
*
* ~~~
* $provider = new ActiveDataProvider(array(
* 'query' => Post::find(),
* 'pagination' => array(
* 'pageSize' => 20,
* ),
* ));
*
* // get the posts in the current page
* $posts = $provider->getModels();
* ~~~
*
* And the following example shows how to use ActiveDataProvider without ActiveRecord:
*
* ~~~
* $query = new Query;
* $provider = new ActiveDataProvider(array(
* 'query' => $query->from('tbl_post'),
* 'pagination' => array(
* 'pageSize' => 20,
* ),
* ));
*
* // get the posts in the current page
* $posts = $provider->getModels();
* ~~~
*
* @property integer $count The number of data models in the current page. This property is read-only.
* @property array $keys The list of key values corresponding to [[models]]. Each data model in [[models]] is
* uniquely identified by the corresponding key value in this array. This property is read-only.
* @property array $models The list of data models in the current page. This property is read-only.
* @property integer $totalCount Total number of possible data models.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class ActiveDataProvider extends DataProvider
{
/**
* @var Query the query that is used to fetch data models and [[totalCount]]
* if it is not explicitly set.
*/
public $query;
/**
* @var string|callable the column that is used as the key of the data models.
* This can be either a column name, or a callable that returns the key value of a given data model.
*
* If this is not set, the following rules will be used to determine the keys of the data models:
*
* - If [[query]] is an [[ActiveQuery]] instance, the primary keys of [[ActiveQuery::modelClass]] will be used.
* - Otherwise, the keys of the [[models]] array will be used.
*
* @see getKeys()
*/
public $key;
/**
* @var Connection|string the DB connection object or the application component ID of the DB connection.
* If not set, the default DB connection will be used.
*/
public $db;
private $_models;
private $_keys;
private $_totalCount;
/**
* Initializes the DbCache component.
* This method will initialize the [[db]] property to make sure it refers to a valid DB connection.
* @throws InvalidConfigException if [[db]] is invalid.
*/
public function init()
{
parent::init();
if (is_string($this->db)) {
$this->db = Yii::$app->getComponent($this->db);
if (!$this->db instanceof Connection) {
throw new InvalidConfigException('The "db" property must be a valid DB Connection application component.');
}
}
}
/**
* Returns the number of data models in the current page.
* This is equivalent to `count($provider->models)`.
* When [[pagination]] is false, this is the same as [[totalCount]].
* @return integer the number of data models in the current page.
*/
public function getCount()
{
return count($this->getModels());
}
/**
* Returns the total number of data models.
* When [[pagination]] is false, this returns the same value as [[count]].
* If [[totalCount]] is not explicitly set, it will be calculated
* using [[query]] with a COUNT query.
* @return integer total number of possible data models.
* @throws InvalidConfigException
*/
public function getTotalCount()
{
if ($this->getPagination() === false) {
return $this->getCount();
} elseif ($this->_totalCount === null) {
if (!$this->query instanceof Query) {
throw new InvalidConfigException('The "query" property must be an instance of Query or its subclass.');
}
$query = clone $this->query;
$this->_totalCount = $query->limit(-1)->offset(-1)->count('*', $this->db);
}
return $this->_totalCount;
}
/**
* Sets the total number of data models.
* @param integer $value the total number of data models.
*/
public function setTotalCount($value)
{
$this->_totalCount = $value;
}
/**
* Returns the data models in the current page.
* @return array the list of data models in the current page.
* @throws InvalidConfigException if [[query]] is not set or invalid.
*/
public function getModels()
{
if ($this->_models === null) {
if (!$this->query instanceof Query) {
throw new InvalidConfigException('The "query" property must be an instance of Query or its subclass.');
}
if (($pagination = $this->getPagination()) !== false) {
$this->query->limit($pagination->getLimit())->offset($pagination->getOffset());
}
if (($sort = $this->getSort()) !== false) {
$this->query->addOrderBy($sort->getOrders());
}
$this->_models = $this->query->all($this->db);
}
return $this->_models;
}
/**
* Returns the key values associated with the data models.
* @return array the list of key values corresponding to [[models]]. Each data model in [[models]]
* is uniquely identified by the corresponding key value in this array.
*/
public function getKeys()
{
if ($this->_keys === null) {
$this->_keys = array();
$models = $this->getModels();
if ($this->key !== null) {
foreach ($models as $model) {
if (is_string($this->key)) {
$this->_keys[] = $model[$this->key];
} else {
$this->_keys[] = call_user_func($this->key, $model);
}
}
} elseif ($this->query instanceof ActiveQuery) {
/** @var \yii\db\ActiveRecord $class */
$class = $this->query->modelClass;
$pks = $class::primaryKey();
if (count($pks) === 1) {
$pk = $pks[0];
foreach ($models as $model) {
$this->_keys[] = $model[$pk];
}
} else {
foreach ($models as $model) {
$keys = array();
foreach ($pks as $pk) {
$keys[] = $model[$pk];
}
$this->_keys[] = json_encode($keys);
}
}
} else {
$this->_keys = array_keys($models);
}
}
return $this->_keys;
}
/**
* Refreshes the data provider.
* After calling this method, if [[getModels()]], [[getKeys()]] or [[getTotalCount()]] is called again,
* they will re-execute the query and return the latest data available.
*/
public function refresh()
{
$this->_models = null;
$this->_totalCount = null;
$this->_keys = null;
}
/**
* @inheritdoc
*/
public function setSort($value)
{
parent::setSort($value);
if (($sort = $this->getSort()) !== false && empty($sort->attributes) &&
$this->query instanceof ActiveQuery) {
/** @var Model $model */
$model = new $this->query->modelClass;
foreach($model->attributes() as $attribute) {
$sort->attributes[$attribute] = array(
'asc' => array($attribute => Sort::ASC),
'desc' => array($attribute => Sort::DESC),
'label' => $model->getAttributeLabel($attribute),
);
}
}
}
}