public static function model($className=__CLASS__)
{
if(isset(self::$_models[$className]))
return self::$_models[$className];
else
{
$model=self::$_models[$className]=new $className(null);
$model->attachBehaviors($model->behaviors());
return $model;
}
}public function findByPk($pk,$condition='',$params=array())
{
Yii::trace(get_class($this).'.findByPk()','system.db.ar.CActiveRecord');
$prefix=$this->getTableAlias(true).'.';
$criteria=$this->getCommandBuilder()->createPkCriteria($this->getTableSchema(),$pk,$condition,$params,$prefix);
return $this->query($criteria);
}class Model extends yii\Db\ActiveRecord {
public function getPrev() {
return self::find()->where(['<', 'id', $this->id])->orderBy('id DESC')->one();
}
public function getNext() {
return self::find()->where(['>', 'id', $this->id])->orderBy('id ASC')->one();
}
}public $fields = [];public function rules() {
return [
...
['fields', 'validateFields'],
...
];
}public function validateFields() {
for ($i = 0; $i < count($this->fields); ++$i) {
...
}
}<?php $form->field($model, 'fields[]') ?>
class User extends ActiveRecord implements IdentityInterface {
public static function tableName() {
return 'users';
}
public static function findIdentity($id) {
return static::findOne($id);
}
public static function findIdentityByAccessToken($token, $type = null) {
return static::findOne(['access_token' => $token]);
}
public function getId() {
return $this->getPrimaryKey();
}
public function getAuthKey() {
return $this->auth_key;
}
public function validateAuthKey($authKey) {
return $this->getAuthKey() === $authKey;
}
}<?php $model = new SignupForm(); ?>
<?php $this->render('/site/user/signup', ['model' => $model]); ?>