protected function _init() {
		foreach ($this->_fields as $key => $val) {
			if (is_int($key)) {
				unset($this->_fields[$key]);
				$this->_fields[$val] = $val;
			}
		}
		$model = Libraries::locate('models', $this->_model);

		if (!$model || !class_exists($model)) {
			throw new ClassNotFoundException("Model class '{$this->_model}' not found.");
		}
		$this->_model = $model;
	}