silverstripe /
silverstripe-framework
Complex classes like GridFieldDetailForm_ItemRequest often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use GridFieldDetailForm_ItemRequest, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 243 | class GridFieldDetailForm_ItemRequest extends RequestHandler { |
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| 244 | |||
| 245 | private static $allowed_actions = array( |
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| 246 | 'edit', |
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| 247 | 'view', |
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| 248 | 'ItemEditForm' |
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| 249 | ); |
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| 250 | |||
| 251 | /** |
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| 252 | * |
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| 253 | * @var GridField |
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| 254 | */ |
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| 255 | protected $gridField; |
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| 256 | |||
| 257 | /** |
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| 258 | * |
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| 259 | * @var GridFieldDetailForm |
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| 260 | */ |
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| 261 | protected $component; |
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| 262 | |||
| 263 | /** |
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| 264 | * |
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| 265 | * @var DataObject |
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| 266 | */ |
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| 267 | protected $record; |
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| 268 | |||
| 269 | /** |
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| 270 | * This represents the current parent RequestHandler (which does not necessarily need to be a Controller). |
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| 271 | * It allows us to traverse the RequestHandler chain upwards to reach the Controller stack. |
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| 272 | * |
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| 273 | * @var RequestHandler |
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| 274 | */ |
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| 275 | protected $popupController; |
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| 276 | |||
| 277 | /** |
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| 278 | * |
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| 279 | * @var string |
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| 280 | */ |
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| 281 | protected $popupFormName; |
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| 282 | |||
| 283 | /** |
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| 284 | * @var String |
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| 285 | */ |
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| 286 | protected $template = null; |
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| 287 | |||
| 288 | private static $url_handlers = array( |
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| 289 | '$Action!' => '$Action', |
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| 290 | '' => 'edit', |
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| 291 | ); |
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| 292 | |||
| 293 | /** |
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| 294 | * |
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| 295 | * @param GridFIeld $gridField |
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| 296 | * @param GridFieldDetailForm $component |
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| 297 | * @param DataObject $record |
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| 298 | * @param RequestHandler $requestHandler |
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| 299 | * @param string $popupFormName |
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| 300 | */ |
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| 301 | public function __construct($gridField, $component, $record, $requestHandler, $popupFormName) { |
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| 309 | |||
| 310 | public function Link($action = null) { |
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| 314 | |||
| 315 | public function view($request) { |
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| 316 | if(!$this->record->canView()) { |
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| 317 | $this->httpError(403); |
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| 318 | } |
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| 319 | |||
| 320 | $controller = $this->getToplevelController(); |
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| 321 | |||
| 322 | $form = $this->ItemEditForm(); |
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| 323 | $form->makeReadonly(); |
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| 324 | |||
| 325 | $data = new ArrayData(array( |
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| 326 | 'Backlink' => $controller->Link(), |
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| 327 | 'ItemEditForm' => $form |
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| 328 | )); |
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| 329 | $return = $data->renderWith($this->getTemplates()); |
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| 330 | |||
| 331 | if($request->isAjax()) { |
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| 332 | return $return; |
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| 333 | } else { |
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| 334 | return $controller->customise(array('Content' => $return)); |
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| 335 | } |
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| 336 | } |
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| 337 | |||
| 338 | public function edit($request) { |
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| 339 | $controller = $this->getToplevelController(); |
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| 340 | $form = $this->ItemEditForm(); |
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| 341 | |||
| 342 | $return = $this->customise(array( |
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| 343 | 'Backlink' => $controller->hasMethod('Backlink') ? $controller->Backlink() : $controller->Link(), |
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| 344 | 'ItemEditForm' => $form, |
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| 345 | ))->renderWith($this->getTemplates()); |
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| 346 | |||
| 347 | if($request->isAjax()) { |
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| 348 | return $return; |
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| 349 | } else { |
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| 350 | // If not requested by ajax, we need to render it within the controller context+template |
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| 351 | return $controller->customise(array( |
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| 352 | // TODO CMS coupling |
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| 353 | 'Content' => $return, |
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| 354 | )); |
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| 355 | } |
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| 356 | } |
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| 357 | |||
| 358 | /** |
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| 359 | * Builds an item edit form. The arguments to getCMSFields() are the popupController and |
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| 360 | * popupFormName, however this is an experimental API and may change. |
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| 361 | * |
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| 362 | * @todo In the future, we will probably need to come up with a tigher object representing a partially |
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| 363 | * complete controller with gaps for extra functionality. This, for example, would be a better way |
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| 364 | * of letting Security/login put its log-in form inside a UI specified elsewhere. |
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| 365 | * |
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| 366 | * @return Form |
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| 367 | */ |
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| 368 | public function ItemEditForm() { |
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| 369 | $list = $this->gridField->getList(); |
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| 370 | |||
| 371 | if (empty($this->record)) { |
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| 372 | $controller = $this->getToplevelController(); |
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| 373 | $url = $controller->getRequest()->getURL(); |
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| 374 | $noActionURL = $controller->removeAction($url); |
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| 375 | $controller->getResponse()->removeHeader('Location'); //clear the existing redirect |
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| 376 | return $controller->redirect($noActionURL, 302); |
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| 377 | } |
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| 378 | |||
| 379 | $canView = $this->record->canView(); |
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| 380 | $canEdit = $this->record->canEdit(); |
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| 381 | $canDelete = $this->record->canDelete(); |
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| 382 | $canCreate = $this->record->canCreate(); |
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| 383 | |||
| 384 | if(!$canView) { |
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| 385 | $controller = $this->getToplevelController(); |
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| 386 | // TODO More friendly error |
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| 387 | return $controller->httpError(403); |
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| 388 | } |
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| 389 | |||
| 390 | // Build actions |
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| 391 | $actions = $this->getFormActions(); |
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| 392 | |||
| 393 | // If we are creating a new record in a has-many list, then |
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| 394 | // pre-populate the record's foreign key. |
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| 395 | if($list instanceof HasManyList && !$this->record->isInDB()) { |
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| 396 | $key = $list->getForeignKey(); |
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| 397 | $id = $list->getForeignID(); |
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| 398 | $this->record->$key = $id; |
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| 399 | } |
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| 400 | |||
| 401 | $fields = $this->component->getFields(); |
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| 402 | if(!$fields) $fields = $this->record->getCMSFields(); |
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| 403 | |||
| 404 | // If we are creating a new record in a has-many list, then |
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| 405 | // Disable the form field as it has no effect. |
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| 406 | if($list instanceof HasManyList) { |
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| 407 | $key = $list->getForeignKey(); |
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| 408 | |||
| 409 | if($field = $fields->dataFieldByName($key)) { |
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| 410 | $fields->makeFieldReadonly($field); |
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| 411 | } |
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| 412 | } |
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| 413 | |||
| 414 | // Caution: API violation. Form expects a Controller, but we are giving it a RequestHandler instead. |
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| 415 | // Thanks to this however, we are able to nest GridFields, and also access the initial Controller by |
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| 416 | // dereferencing GridFieldDetailForm_ItemRequest->getController() multiple times. See getToplevelController |
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| 417 | // below. |
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| 418 | $form = new Form( |
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| 419 | $this, |
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| 420 | 'ItemEditForm', |
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| 421 | $fields, |
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| 422 | $actions, |
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| 423 | $this->component->getValidator() |
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| 424 | ); |
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| 425 | |||
| 426 | $form->loadDataFrom($this->record, $this->record->ID == 0 ? Form::MERGE_IGNORE_FALSEISH : Form::MERGE_DEFAULT); |
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| 427 | |||
| 428 | if($this->record->ID && !$canEdit) { |
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| 429 | // Restrict editing of existing records |
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| 430 | $form->makeReadonly(); |
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| 431 | // Hack to re-enable delete button if user can delete |
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| 432 | if ($canDelete) { |
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| 433 | $form->Actions()->fieldByName('action_doDelete')->setReadonly(false); |
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| 434 | } |
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| 435 | } elseif(!$this->record->ID && !$canCreate) { |
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| 436 | // Restrict creation of new records |
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| 437 | $form->makeReadonly(); |
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| 438 | } |
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| 439 | |||
| 440 | // Load many_many extraData for record. |
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| 441 | // Fields with the correct 'ManyMany' namespace need to be added manually through getCMSFields(). |
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| 442 | if($list instanceof ManyManyList) { |
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| 443 | $extraData = $list->getExtraData('', $this->record->ID); |
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| 444 | $form->loadDataFrom(array('ManyMany' => $extraData)); |
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| 445 | } |
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| 446 | |||
| 447 | // TODO Coupling with CMS |
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| 448 | $toplevelController = $this->getToplevelController(); |
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| 449 | if($toplevelController && $toplevelController instanceof LeftAndMain) { |
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| 450 | // Always show with base template (full width, no other panels), |
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| 451 | // regardless of overloaded CMS controller templates. |
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| 452 | // TODO Allow customization, e.g. to display an edit form alongside a search form from the CMS controller |
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| 453 | $form->setTemplate([ |
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| 454 | 'type' => 'Includes', |
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| 455 | 'SilverStripe\\Admin\\LeftAndMain_EditForm', |
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| 456 | ]); |
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| 457 | $form->addExtraClass('cms-content cms-edit-form center'); |
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| 458 | $form->setAttribute('data-pjax-fragment', 'CurrentForm Content'); |
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| 459 | if($form->Fields()->hasTabset()) { |
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| 460 | $form->Fields()->findOrMakeTab('Root')->setTemplate('CMSTabSet'); |
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| 461 | $form->addExtraClass('cms-tabset'); |
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| 462 | } |
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| 463 | |||
| 464 | $form->Backlink = $this->getBackLink(); |
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| 465 | } |
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| 466 | |||
| 467 | $cb = $this->component->getItemEditFormCallback(); |
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| 468 | if($cb) $cb($form, $this); |
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| 469 | $this->extend("updateItemEditForm", $form); |
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| 470 | return $form; |
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| 471 | } |
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| 472 | |||
| 473 | /** |
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| 474 | * Build the set of form field actions for this DataObject |
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| 475 | * |
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| 476 | * @return FieldList |
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| 477 | */ |
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| 478 | protected function getFormActions() { |
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| 479 | $canEdit = $this->record->canEdit(); |
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| 480 | $canDelete = $this->record->canDelete(); |
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| 481 | $actions = new FieldList(); |
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| 482 | if($this->record->ID !== 0) { |
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| 483 | if($canEdit) { |
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| 484 | $actions->push(FormAction::create('doSave', _t('GridFieldDetailForm.Save', 'Save')) |
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| 485 | ->setUseButtonTag(true) |
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| 486 | ->addExtraClass('ss-ui-action-constructive') |
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| 487 | ->setAttribute('data-icon', 'accept')); |
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| 488 | } |
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| 489 | |||
| 490 | if($canDelete) { |
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| 491 | $actions->push(FormAction::create('doDelete', _t('GridFieldDetailForm.Delete', 'Delete')) |
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| 492 | ->setUseButtonTag(true) |
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| 493 | ->addExtraClass('ss-ui-action-destructive action-delete')); |
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| 494 | } |
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| 495 | |||
| 496 | } else { // adding new record |
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| 497 | //Change the Save label to 'Create' |
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| 498 | $actions->push(FormAction::create('doSave', _t('GridFieldDetailForm.Create', 'Create')) |
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| 499 | ->setUseButtonTag(true) |
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| 500 | ->addExtraClass('ss-ui-action-constructive') |
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| 501 | ->setAttribute('data-icon', 'add')); |
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| 502 | |||
| 503 | // Add a Cancel link which is a button-like link and link back to one level up. |
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| 504 | $crumbs = $this->Breadcrumbs(); |
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| 505 | if($crumbs && $crumbs->count() >= 2){ |
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| 506 | $oneLevelUp = $crumbs->offsetGet($crumbs->count() - 2); |
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| 507 | $text = sprintf( |
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| 508 | "<a class=\"%s\" href=\"%s\">%s</a>", |
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| 509 | "crumb ss-ui-button ss-ui-action-destructive cms-panel-link ui-corner-all", // CSS classes |
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| 510 | $oneLevelUp->Link, // url |
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| 511 | _t('GridFieldDetailForm.CancelBtn', 'Cancel') // label |
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| 512 | ); |
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| 513 | $actions->push(new LiteralField('cancelbutton', $text)); |
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| 514 | } |
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| 515 | } |
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| 516 | $this->extend('updateFormActions', $actions); |
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| 517 | return $actions; |
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| 518 | } |
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| 519 | |||
| 520 | /** |
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| 521 | * Traverse the nested RequestHandlers until we reach something that's not GridFieldDetailForm_ItemRequest. |
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| 522 | * This allows us to access the Controller responsible for invoking the top-level GridField. |
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| 523 | * This should be equivalent to getting the controller off the top of the controller stack via Controller::curr(), |
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| 524 | * but allows us to avoid accessing the global state. |
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| 525 | * |
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| 526 | * GridFieldDetailForm_ItemRequests are RequestHandlers, and as such they are not part of the controller stack. |
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| 527 | * |
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| 528 | * @return Controller |
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| 529 | */ |
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| 530 | protected function getToplevelController() { |
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| 531 | $c = $this->popupController; |
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| 532 | while($c && $c instanceof GridFieldDetailForm_ItemRequest) { |
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| 533 | $c = $c->getController(); |
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| 534 | } |
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| 535 | return $c; |
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| 536 | } |
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| 537 | |||
| 538 | protected function getBackLink(){ |
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| 539 | // TODO Coupling with CMS |
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| 540 | $backlink = ''; |
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| 541 | $toplevelController = $this->getToplevelController(); |
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| 542 | if($toplevelController && $toplevelController instanceof LeftAndMain) { |
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| 543 | if($toplevelController->hasMethod('Backlink')) { |
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| 544 | $backlink = $toplevelController->Backlink(); |
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| 545 | } elseif($this->popupController->hasMethod('Breadcrumbs')) { |
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| 546 | $parents = $this->popupController->Breadcrumbs(false)->items; |
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| 547 | $backlink = array_pop($parents)->Link; |
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| 548 | } |
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| 549 | } |
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| 550 | if(!$backlink) $backlink = $toplevelController->Link(); |
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| 551 | |||
| 552 | return $backlink; |
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| 553 | } |
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| 554 | |||
| 555 | /** |
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| 556 | * Get the list of extra data from the $record as saved into it by |
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| 557 | * {@see Form::saveInto()} |
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| 558 | * |
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| 559 | * Handles detection of falsey values explicitly saved into the |
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| 560 | * DataObject by formfields |
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| 561 | * |
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| 562 | * @param DataObject $record |
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| 563 | * @param SS_List $list |
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| 564 | * @return array List of data to write to the relation |
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| 565 | */ |
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| 566 | protected function getExtraSavedData($record, $list) { |
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| 567 | // Skip extra data if not ManyManyList |
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| 568 | if(!($list instanceof ManyManyList)) { |
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| 569 | return null; |
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| 570 | } |
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| 571 | |||
| 572 | $data = array(); |
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| 573 | foreach($list->getExtraFields() as $field => $dbSpec) { |
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| 574 | $savedField = "ManyMany[{$field}]"; |
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| 575 | if($record->hasField($savedField)) { |
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| 576 | $data[$field] = $record->getField($savedField); |
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| 577 | } |
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| 578 | } |
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| 579 | return $data; |
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| 580 | } |
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| 581 | |||
| 582 | public function doSave($data, $form) { |
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| 583 | $isNewRecord = $this->record->ID == 0; |
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| 584 | |||
| 585 | // Check permission |
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| 586 | if (!$this->record->canEdit()) { |
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| 587 | return $this->httpError(403); |
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| 588 | } |
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| 589 | |||
| 590 | // Save from form data |
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| 591 | try { |
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| 592 | $this->saveFormIntoRecord($data, $form); |
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| 593 | } catch (ValidationException $e) { |
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| 594 | return $this->generateValidationResponse($form, $e); |
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| 595 | } |
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| 596 | |||
| 597 | $link = '<a href="' . $this->Link('edit') . '">"' |
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| 598 | . htmlspecialchars($this->record->Title, ENT_QUOTES) |
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| 599 | . '"</a>'; |
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| 600 | $message = _t( |
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| 601 | 'GridFieldDetailForm.Saved', |
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| 602 | 'Saved {name} {link}', |
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| 603 | array( |
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| 604 | 'name' => $this->record->i18n_singular_name(), |
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| 605 | 'link' => $link |
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| 606 | ) |
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| 607 | ); |
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| 608 | |||
| 609 | $form->sessionMessage($message, 'good', false); |
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| 610 | |||
| 611 | // Redirect after save |
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| 612 | return $this->redirectAfterSave($isNewRecord); |
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| 613 | } |
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| 614 | |||
| 615 | /** |
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| 616 | * Response object for this request after a successful save |
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| 617 | * |
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| 618 | * @param bool $isNewRecord True if this record was just created |
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| 619 | * @return SS_HTTPResponse|DBHTMLText |
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| 620 | */ |
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| 621 | protected function redirectAfterSave($isNewRecord) { |
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| 622 | $controller = $this->getToplevelController(); |
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| 623 | if($isNewRecord) { |
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| 624 | return $controller->redirect($this->Link()); |
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| 625 | } elseif($this->gridField->getList()->byID($this->record->ID)) { |
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| 626 | // Return new view, as we can't do a "virtual redirect" via the CMS Ajax |
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| 627 | // to the same URL (it assumes that its content is already current, and doesn't reload) |
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| 628 | return $this->edit($controller->getRequest()); |
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| 629 | } else { |
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| 630 | // Changes to the record properties might've excluded the record from |
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| 631 | // a filtered list, so return back to the main view if it can't be found |
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| 632 | $url = $controller->getRequest()->getURL(); |
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| 633 | $noActionURL = $controller->removeAction($url); |
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| 634 | $controller->getRequest()->addHeader('X-Pjax', 'Content'); |
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| 635 | return $controller->redirect($noActionURL, 302); |
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| 636 | } |
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| 637 | } |
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| 638 | |||
| 639 | public function httpError($errorCode, $errorMessage = null) { |
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| 640 | $controller = $this->getToplevelController(); |
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| 641 | return $controller->httpError($errorCode, $errorMessage); |
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| 642 | } |
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| 643 | |||
| 644 | /** |
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| 645 | * Loads the given form data into the underlying dataobject and relation |
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| 646 | * |
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| 647 | * @param array $data |
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| 648 | * @param Form $form |
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| 649 | * @throws ValidationException On error |
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| 650 | * @return DataObject Saved record |
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| 651 | */ |
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| 652 | protected function saveFormIntoRecord($data, $form) { |
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| 653 | $list = $this->gridField->getList(); |
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| 654 | |||
| 655 | // Check object matches the correct classname |
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| 656 | if (isset($data['ClassName']) && $data['ClassName'] != $this->record->ClassName) { |
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| 657 | $newClassName = $data['ClassName']; |
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| 658 | // The records originally saved attribute was overwritten by $form->saveInto($record) before. |
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| 659 | // This is necessary for newClassInstance() to work as expected, and trigger change detection |
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| 660 | // on the ClassName attribute |
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| 661 | $this->record->setClassName($this->record->ClassName); |
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| 662 | // Replace $record with a new instance |
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| 663 | $this->record = $this->record->newClassInstance($newClassName); |
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| 664 | } |
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| 665 | |||
| 666 | // Save form and any extra saved data into this dataobject |
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| 667 | $form->saveInto($this->record); |
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| 668 | $this->record->write(); |
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| 669 | $extraData = $this->getExtraSavedData($this->record, $list); |
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| 670 | $list->add($this->record, $extraData); |
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| 671 | |||
| 672 | return $this->record; |
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| 673 | } |
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| 674 | |||
| 675 | /** |
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| 676 | * Generate a response object for a form validation error |
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| 677 | * |
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| 678 | * @param Form $form The source form |
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| 679 | * @param ValidationException $e The validation error message |
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| 680 | * @return SS_HTTPResponse |
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| 681 | * @throws SS_HTTPResponse_Exception |
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| 682 | */ |
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| 683 | protected function generateValidationResponse($form, $e) { |
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| 684 | $controller = $this->getToplevelController(); |
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| 685 | |||
| 686 | $form->sessionMessage($e->getResult()->message(), 'bad', false); |
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| 687 | $responseNegotiator = new PjaxResponseNegotiator(array( |
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| 688 | 'CurrentForm' => function() use(&$form) { |
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| 689 | return $form->forTemplate(); |
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| 690 | }, |
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| 691 | 'default' => function() use(&$controller) { |
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| 692 | return $controller->redirectBack(); |
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| 693 | } |
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| 694 | )); |
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| 695 | if($controller->getRequest()->isAjax()){ |
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| 696 | $controller->getRequest()->addHeader('X-Pjax', 'CurrentForm'); |
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| 697 | } |
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| 698 | return $responseNegotiator->respond($controller->getRequest()); |
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| 699 | } |
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| 700 | |||
| 701 | |||
| 702 | public function doDelete($data, $form) { |
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| 703 | $title = $this->record->Title; |
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| 704 | $backLink = $this->getBacklink(); |
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| 705 | try { |
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| 706 | if (!$this->record->canDelete()) { |
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| 707 | throw new ValidationException( |
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| 708 | _t('GridFieldDetailForm.DeletePermissionsFailure',"No delete permissions"),0); |
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| 709 | } |
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| 710 | |||
| 711 | $this->record->delete(); |
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| 712 | } catch(ValidationException $e) { |
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| 713 | $form->sessionMessage($e->getResult()->message(), 'bad', false); |
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| 714 | return $this->getToplevelController()->redirectBack(); |
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| 715 | } |
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| 716 | |||
| 717 | $message = sprintf( |
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| 718 | _t('GridFieldDetailForm.Deleted', 'Deleted %s %s'), |
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| 719 | $this->record->i18n_singular_name(), |
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| 720 | htmlspecialchars($title, ENT_QUOTES) |
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| 721 | ); |
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| 722 | |||
| 723 | $toplevelController = $this->getToplevelController(); |
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| 724 | if($toplevelController && $toplevelController instanceof LeftAndMain) { |
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| 725 | $backForm = $toplevelController->getEditForm(); |
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| 726 | $backForm->sessionMessage($message, 'good', false); |
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| 727 | } else { |
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| 728 | $form->sessionMessage($message, 'good', false); |
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| 729 | } |
||
| 730 | |||
| 731 | //when an item is deleted, redirect to the parent controller |
||
| 732 | $controller = $this->getToplevelController(); |
||
| 733 | $controller->getRequest()->addHeader('X-Pjax', 'Content'); // Force a content refresh |
||
| 734 | |||
| 735 | return $controller->redirect($backLink, 302); //redirect back to admin section |
||
| 736 | } |
||
| 737 | |||
| 738 | /** |
||
| 739 | * @param string $template |
||
| 740 | * @return $this |
||
| 741 | */ |
||
| 742 | public function setTemplate($template) { |
||
| 746 | |||
| 747 | /** |
||
| 748 | * @return String |
||
| 749 | */ |
||
| 750 | public function getTemplate() { |
||
| 753 | |||
| 754 | /** |
||
| 755 | * Get list of templates to use |
||
| 756 | * |
||
| 757 | * @return array |
||
| 758 | */ |
||
| 759 | public function getTemplates() |
||
| 760 | { |
||
| 761 | $templates = SSViewer::get_templates_by_class($this, '', __CLASS__); |
||
| 762 | // Prefer any custom template |
||
| 763 | if($this->getTemplate()) { |
||
| 764 | array_unshift($templates, $this->getTemplate()); |
||
| 765 | } |
||
| 766 | return $templates; |
||
| 768 | |||
| 769 | /** |
||
| 770 | * @return Controller |
||
| 771 | */ |
||
| 772 | public function getController() { |
||
| 775 | |||
| 776 | /** |
||
| 777 | * @return GridField |
||
| 778 | */ |
||
| 779 | public function getGridField() { |
||
| 782 | |||
| 783 | /** |
||
| 784 | * @return DataObject |
||
| 785 | */ |
||
| 786 | public function getRecord() { |
||
| 789 | |||
| 790 | /** |
||
| 791 | * CMS-specific functionality: Passes through navigation breadcrumbs |
||
| 792 | * to the template, and includes the currently edited record (if any). |
||
| 793 | * see {@link LeftAndMain->Breadcrumbs()} for details. |
||
| 794 | * |
||
| 795 | * @param boolean $unlinked |
||
| 796 | * @return ArrayData |
||
| 797 | */ |
||
| 798 | public function Breadcrumbs($unlinked = false) { |
||
| 817 | } |
||
| 818 |
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Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: