public function updateSource(Variable $variable, $newDatasourceId)
{
if (!empty($newDatasourceId)) {
//is it event necessary to update source?
if ($variable->fk_dsr_id != $newDatasourceId) {
//it is update both variable source all sources of all variable values
$variable->fk_dsr_id = $newDatasourceId;
$variable->save();
//update all variable values
DataValue::where('fk_var_id', $variable->id)->update(array('fk_dsr_id' => $newDatasourceId));
Cache::flush();
}
}
}
