*/
public static $defaultConnection;
+ /**
+ * @var callable
+ */
+ public static $defaultResolver;
+
/**
* @var \pq\Connection
*/
* @var \pq\Query\ExecutorInterface
*/
protected $exec;
-
+
/**
- * @var array
+ * @var \pq\Gateway\Table\Relations
*/
- protected $dependents;
+ protected $relations;
+ /**
+ * @param string $table
+ * @return \pq\Gateway\Table
+ */
+ public static function resolve($table) {
+ if ($table instanceof Table) {
+ return $table;
+ }
+ if (is_callable(static::$defaultResolver)) {
+ if (($resolved = call_user_func(static::$defaultResolver, $table))) {
+ return $resolved;
+ }
+ }
+ return new Table($table);
+ }
+
/**
* @param string $name
* @param \pq\Connection $conn
* @param array $dependents
*/
- function __construct($name, \pq\Connection $conn = null, array $dependents = array()) {
+ function __construct($name, \pq\Connection $conn = null) {
$this->name = $name;
$this->conn = $conn ?: static::$defaultConnection ?: new \pq\Connection;
- $this->dependents = $dependents;
}
/**
return $this->exec;
}
+ /**
+ * Get foreign key relations
+ * @param string $to fkey
+ * @return \pq\Gateway\Table\Relations|stdClass
+ */
+ function getRelations($to = null) {
+ if (!isset($this->relations)) {
+ $this->relations = new Table\Relations($this);
+ }
+ if (isset($to)) {
+ if (!isset($this->relations->$to)) {
+ return null;
+ }
+ return $this->relations->$to;
+ }
+ return $this->relations;
+ }
+
+ /**
+ * Check whether a certain relation exists
+ * @param string $name
+ * @param string $table
+ * @return bool
+ */
+ function hasRelation($name, $table = null) {
+ if (!($rel = $this->getRelations($name))) {
+ return false;
+ }
+ if (!isset($table)) {
+ return true;
+ }
+ return isset($rel->$table);
+ }
+
/**
* @return \pq\Connection
*/
* @return mixed
*/
protected function execute(QueryWriter $query) {
+ echo $query,"\n",json_encode($query->getParams()),"\n";
return $this->getQueryExecutor()->execute($query, array($this, "onResult"));
}
* @param \pq\Result $result
* @return mixed
*/
- public function onResult(\pq\Result $result) {
- if ($result->status != \pq\Result::TUPLES_OK) {
+ public function onResult(\pq\Result $result = null) {
+ if ($result && $result->status != \pq\Result::TUPLES_OK) {
return $result;
}
}
/**
- * Get the parent row of a row by foreign key
- * @param \pq\Gateway\Row $dependent
+ * Get the child rows of a row by foreign key
+ * @param \pq\Gateway\Row $foreign
* @param string $name optional fkey name
* @param string $order
* @param int $limit
* @param int $offset
* @return mixed
*/
- function of(Row $dependent, $name = null, $order = null, $limit = 0, $offset = 0) {
- if (!$name) {
- $name = $dependent->getTable()->getName();
+ function of(Row $foreign, $name = null, $order = null, $limit = 0, $offset = 0) {
+ // select * from $this where $this->$foreignColumn = $foreign->$referencedColumn
+
+ if (!isset($name)) {
+ $name = $this->getName();
+ }
+
+ if (!$foreign->getTable()->hasRelation($name, $this->getName())) {
+ return $this->onResult(null);
}
- return $this->find(array("{$name}_id=" => $dependent->id),
- $order, $limit, $offset);
+ $rel = $foreign->getTable()->getRelations($name)->{$this->getName()};
+
+ return $this->find(
+ array($rel->foreignColumn . "=" => $foreign->{$rel->referencedColumn}),
+ $order, $limit, $offset
+ );
}
/**
- * Get the child rows of a row by foreign key
+ * Get the parent rows of a row by foreign key
* @param \pq\Gateway\Row $me
- * @param string $dependent
+ * @param string $foreign
* @param string $order
* @param int $limit
* @param int $offset
* @return mixed
- * @throws \LogicException
*/
- function by(Row $me, $dependent, $order = null, $limit = 0, $offset = 0) {
- if (!isset($this->dependents[$dependent])) {
- throw new \LogicException("Unknown dependent table $dependent");
+ function by(Row $me, $foreign, $order = null, $limit = 0, $offset = 0) {
+ // select * from $foreign where $foreign->$referencedColumn = $me->$foreignColumn
+
+ if (!$this->hasRelation($foreign, $this->getName())) {
+ return $this->onResult(null);
}
+ $rel = $this->getRelations($foreign)->{$this->getName()};
- $dependentClass = $this->dependents[$dependent];
- $dependentModel = new $dependentClass($this->conn);
- return $dependentModel->of($me, null, $order, $limit, $offset);
+ return static::resolve($rel->referencedTable)->find(
+ array($rel->referencedColumn . "=" => $me->{$rel->foreignColumn}),
+ $order, $limit, $offset
+ );
}
/**