public function eager_load($target)
{
$cache = WaxModel::get_cache($this->target_model . ":" . md5(serialize($target->filters)), $this->field, $this->model->primval, false);
if (is_array($cache)) {
return new WaxModelAssociation($this->model, $target, $cache, $this->field);
}
$vals = $target->filter(array($this->join_field => $this->model->primval))->all();
WaxModel::set_cache($this->target_model . ":" . md5(serialize($target->filters)), $this->field, $this->model->primval, $vals->rowset);
return new WaxModelAssociation($this->model, $target, $vals->rowset, $this->field);
}
public function get()
{
$class = $this->target_model;
if ($cache = WaxModel::get_cache($class, $this->field, $this->model->primval)) {
return $cache;
}
$model = new $this->target_model($this->model->{$this->col_name});
if ($model->primval) {
WaxModel::set_cache($class, $this->field, $this->model->primval, $model);
return $model;
} else {
return false;
}
}
/**
* get the root nodes
* now with caching! yey!
* @return WaxRecordSet of all the self-parented nodes or nodes with unidentifiable parents
*/
public function roots()
{
if ($root_return = WaxModel::get_cache($this->table, "parent", "rootnodes")) {
return $root_return;
}
/** Methods of finding a root node **/
//First method: parent reference same as primary key
$filter[] = "{$this->parent_column}_{$this->primary_key} = {$this->primary_key}";
//Second method: parent references a non-existant node (including 0)
$filter[] = "{$this->parent_column}_{$this->primary_key} NOT IN (SELECT {$this->primary_key} FROM `{$this->table}`)";
//Third method: parent references a nothing
$filter[] = "{$this->parent_column}_{$this->primary_key} IS NULL OR {$this->parent_column}_{$this->primary_key} = 0";
$root_return = $this->filter("(" . join(" OR ", $filter) . ")")->order('id')->all();
if ($root_return) {
return $root_return;
} else {
return false;
}
}
private function lazy_load($target_model)
{
$left_field = $this->model->table . "_" . $this->model->primary_key;
$right_field = $target_model->table . "_" . $target_model->primary_key;
$this->join_model->select_columns = $right_field;
$ids = array();
if ($cache = WaxModel::get_cache(get_class($this->model), $this->field, $this->model->primval . ":" . md5(serialize($target_model->filters)), false)) {
return new WaxModelAssociation($this->model, $target_model, $cache, $this->field);
}
foreach ($this->join_model->rows() as $row) {
$ids[] = $row[$right_field];
}
WaxModel::set_cache(get_class($this->model), $this->field, $this->model->primval . ":" . md5(serialize($target_model->filters)), $ids);
return new WaxModelAssociation($this->model, $target_model, $ids, $this->field);
}
