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76 lines
1.9 KiB
76 lines
1.9 KiB
13 years ago
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<?php
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namespace yii\db\ar;
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use yii\db\Exception;
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/**
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* ActiveMetaData represents the meta-data for an Active Record class.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class ActiveMetaData
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{
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/**
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* @var TableSchema the table schema information
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*/
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public $table;
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/**
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* @var array list of relations
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*/
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public $relations = array();
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/**
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* Constructor.
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* @param string $modelClass the model class name
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*/
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public function __construct($modelClass)
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{
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$tableName = $modelClass::tableName();
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$table = $modelClass::getDbConnection()->getDriver()->getTableSchema($tableName);
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if ($table === null) {
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throw new Exception("Unable to find table '$tableName' for ActiveRecord class '$modelClass'.");
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}
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if ($table->primaryKey === null) {
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$primaryKey = $modelClass::primaryKey();
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if ($primaryKey !== null) {
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$table->fixPrimaryKey($primaryKey);
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} else {
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throw new Exception("The table '$tableName' for ActiveRecord class '$modelClass' does not have a primary key.");
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}
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}
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$this->table = $table;
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foreach ($modelClass::relations() as $name => $config) {
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$this->addRelation($name, $config);
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}
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}
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/**
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* Adds a relation.
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*
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* $config is an array with three elements:
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* relation type, the related active record class and the foreign key.
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*
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* @throws Exception
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* @param string $name $name Name of the relation.
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* @param array $config $config Relation parameters.
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* @return void
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*/
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public function addRelation($name, $config)
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{
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if (preg_match('/^(\w+)\s*:\s*\\\\?([\w\\\\]+)(\[\])?$/', $name, $matches)) {
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if (is_string($config)) {
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$config = array('on' => $config);
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}
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$relation = ActiveRelation::newInstance($config);
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$relation->name = $matches[1];
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$relation->modelClass = '\\' . $matches[2];
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$relation->hasMany = isset($matches[3]);
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$this->relations[$relation->name] = $relation;
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} else {
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throw new Exception("Relation name in bad format: $name");
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}
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}
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}
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