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<?php
namespace yii\db\ar;
use yii\db\Exception;
use yii\db\dao\TableSchema;
/**
* ActiveMetaData represents the meta-data for an Active Record class.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class ActiveMetaData
{
/**
* @var ActiveMetaData[] list of ActiveMetaData instances indexed by the model class names
*/
public static $instances;
/**
* @var TableSchema the table schema information
*/
public $table;
/**
* @var string the model class name
*/
public $modelClass;
/**
* @var array list of relations
*/
public $relations = array();
/**
* Returns an instance of ActiveMetaData for the specified model class.
* Note that each model class only has a single ActiveMetaData instance.
* This method will only create the ActiveMetaData instance if it is not previously
* done so for the specified model class.
* @param string $modelClass the model class name. Make sure the class name do NOT have a leading backslash "\".
* @param boolean $refresh whether to recreate the ActiveMetaData instance. Defaults to false.
* @return ActiveMetaData the ActiveMetaData instance for the specified model class.
*/
public static function getInstance($modelClass, $refresh = false)
{
if (isset(self::$instances[$modelClass]) && !$refresh) {
return self::$instances[$modelClass];
} else {
return self::$instances[$modelClass] = new self($modelClass);
}
}
/**
* Constructor.
* @param string $modelClass the model class name
*/
public function __construct($modelClass)
{
$this->modelClass = $modelClass;
$tableName = $modelClass::tableName();
$this->table = $modelClass::getDbConnection()->getDriver()->getTableSchema($tableName);
if ($this->table === null) {
throw new Exception("Unable to find table '$tableName' for ActiveRecord class '$modelClass'.");
}
$primaryKey = $modelClass::primaryKey();
if ($primaryKey !== null) {
$this->table->fixPrimaryKey($primaryKey);
} elseif ($this->table->primaryKey === null) {
throw new Exception("The table '$tableName' for ActiveRecord class '$modelClass' does not have a primary key.");
}
foreach ($modelClass::relations() as $name => $config) {
$this->addRelation($name, $config);
}
}
/**
* Adds a relation.
*
* $config is an array with three elements:
* relation type, the related active record class and the foreign key.
*
* @throws Exception
* @param string $name $name Name of the relation.
* @param array $config $config Relation parameters.
* @return void
*/
public function addRelation($name, $config)
{
if (preg_match('/^(\w+)\s*:\s*\\\\?([\w\\\\]+)(\[\])?$/', $name, $matches)) {
if (is_string($config)) {
$config = array('on' => $config);
}
$relation = new ActiveRelation($config);
$relation->name = $matches[1];
$modelClass = $matches[2];
if (strpos($modelClass, '\\') !== false) {
$relation->modelClass = ltrim($modelClass, '\\');
} else {
$relation->modelClass = dirname($this->modelClass) . '\\' . $modelClass;
}
$relation->hasMany = isset($matches[3]);
$this->relations[$relation->name] = $relation;
} else {
throw new Exception("{$this->modelClass} has an invalid relation: $name");
}
}
}