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- Bug fixes for general core bugs in 4.2.x will end 22 April 2024 (12 months).
- Bug fixes for security issues in 4.2.x will end 7 October 2024 (18 months).
- PHP version: minimum PHP 8.0.0 Note: minimum PHP version has increased since Moodle 4.1. PHP 8.1.x is supported too.
/customfield/classes/ -> handler.php (source)
Differences Between: [Versions 310 and 402] [Versions 311 and 402] [Versions 39 and 402] [Versions 400 and 402]
1 <?php 2 // This file is part of Moodle - http://moodle.org/ 3 // 4 // Moodle is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // Moodle is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU General Public License for more details. 13 // 14 // You should have received a copy of the GNU General Public License 15 // along with Moodle. If not, see <http://www.gnu.org/licenses/>. 16 17 /** 18 * The abstract custom fields handler 19 * 20 * @package core_customfield 21 * @copyright 2018 David Matamoros <davidmc@moodle.com> 22 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 23 */ 24 25 namespace core_customfield; 26 27 use core_customfield\output\field_data; 28 use stdClass; 29 30 defined('MOODLE_INTERNAL') || die; 31 32 /** 33 * Base class for custom fields handlers 34 * 35 * This handler provides callbacks for field configuration form and also allows to add the fields to the instance editing form 36 * 37 * Every plugin that wants to use custom fields must define a handler class: 38 * <COMPONENT_OR_PLUGIN>\customfield\<AREA>_handler extends \core_customfield\handler 39 * 40 * To initiate a class use an appropriate static method: 41 * - <handlerclass>::create - to create an instance of a known handler 42 * - \core_customfield\handler::get_handler - to create an instance of a handler for given component/area/itemid 43 * 44 * Also handler is automatically created when the following methods are called: 45 * - \core_customfield\api::get_field($fieldid) 46 * - \core_customfield\api::get_category($categoryid) 47 * 48 * @package core_customfield 49 * @copyright 2018 David Matamoros <davidmc@moodle.com> 50 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 51 */ 52 abstract class handler { 53 54 /** 55 * The component this handler handles 56 * 57 * @var string $component 58 */ 59 private $component; 60 61 /** 62 * The area within the component 63 * 64 * @var string $area 65 */ 66 private $area; 67 68 /** 69 * The id of the item within the area and component 70 71 * @var int $itemid 72 */ 73 private $itemid; 74 75 /** 76 * @var category_controller[] 77 */ 78 protected $categories = null; 79 80 /** 81 * Handler constructor. 82 * 83 * @param int $itemid 84 */ 85 protected final function __construct(int $itemid = 0) { 86 if (!preg_match('|^(\w+_[\w_]+)\\\\customfield\\\\([\w_]+)_handler$|', static::class, $matches)) { 87 throw new \coding_exception('Handler class name must have format: <PLUGIN>\\customfield\\<AREA>_handler'); 88 } 89 $this->component = $matches[1]; 90 $this->area = $matches[2]; 91 $this->itemid = $itemid; 92 } 93 94 /** 95 * Returns an instance of the handler 96 * 97 * Some areas may choose to use singleton/caching here 98 * 99 * @param int $itemid 100 * @return handler 101 */ 102 public static function create(int $itemid = 0) : handler { 103 return new static($itemid); 104 } 105 106 /** 107 * Returns an instance of handler by component/area/itemid 108 * 109 * @param string $component component name of full frankenstyle plugin name 110 * @param string $area name of the area (each component/plugin may define handlers for multiple areas) 111 * @param int $itemid item id if the area uses them (usually not used) 112 * @return handler 113 */ 114 public static function get_handler(string $component, string $area, int $itemid = 0) : handler { 115 $classname = $component . '\\customfield\\' . $area . '_handler'; 116 if (class_exists($classname) && is_subclass_of($classname, self::class)) { 117 return $classname::create($itemid); 118 } 119 $a = ['component' => s($component), 'area' => s($area)]; 120 throw new \moodle_exception('unknownhandler', 'core_customfield', '', $a); 121 } 122 123 /** 124 * Get component 125 * 126 * @return string 127 */ 128 public function get_component() : string { 129 return $this->component; 130 } 131 132 /** 133 * Get area 134 * 135 * @return string 136 */ 137 public function get_area() : string { 138 return $this->area; 139 } 140 141 /** 142 * Context that should be used for new categories created by this handler 143 * 144 * @return \context 145 */ 146 abstract public function get_configuration_context() : \context; 147 148 /** 149 * URL for configuration of the fields on this handler. 150 * 151 * @return \moodle_url 152 */ 153 abstract public function get_configuration_url() : \moodle_url; 154 155 /** 156 * Context that should be used for data stored for the given record 157 * 158 * @param int $instanceid id of the instance or 0 if the instance is being created 159 * @return \context 160 */ 161 abstract public function get_instance_context(int $instanceid = 0) : \context; 162 163 /** 164 * Get itemid 165 * 166 * @return int|null 167 */ 168 public function get_itemid() : int { 169 return $this->itemid; 170 } 171 172 /** 173 * Uses categories 174 * 175 * @return bool 176 */ 177 public function uses_categories() : bool { 178 return true; 179 } 180 181 /** 182 * Generates a name for the new category 183 * 184 * @param int $suffix 185 * @return string 186 */ 187 protected function generate_category_name($suffix = 0) : string { 188 if ($suffix) { 189 return get_string('otherfieldsn', 'core_customfield', $suffix); 190 } else { 191 return get_string('otherfields', 'core_customfield'); 192 } 193 } 194 195 /** 196 * Creates a new category and inserts it to the database 197 * 198 * @param string $name name of the category, null to generate automatically 199 * @return int id of the new category 200 */ 201 public function create_category(string $name = null) : int { 202 global $DB; 203 $params = ['component' => $this->get_component(), 'area' => $this->get_area(), 'itemid' => $this->get_itemid()]; 204 205 if (empty($name)) { 206 for ($suffix = 0; $suffix < 100; $suffix++) { 207 $name = $this->generate_category_name($suffix); 208 if (!$DB->record_exists(category::TABLE, $params + ['name' => $name])) { 209 break; 210 } 211 } 212 } 213 214 $category = category_controller::create(0, (object)['name' => $name], $this); 215 api::save_category($category); 216 $this->clear_configuration_cache(); 217 return $category->get('id'); 218 } 219 220 /** 221 * Validate that the given category belongs to this handler 222 * 223 * @param category_controller $category 224 * @return category_controller 225 * @throws \moodle_exception 226 */ 227 protected function validate_category(category_controller $category) : category_controller { 228 $categories = $this->get_categories_with_fields(); 229 if (!array_key_exists($category->get('id'), $categories)) { 230 throw new \moodle_exception('categorynotfound', 'core_customfield'); 231 } 232 return $categories[$category->get('id')]; 233 } 234 235 /** 236 * Validate that the given field belongs to this handler 237 * 238 * @param field_controller $field 239 * @return field_controller 240 * @throws \moodle_exception 241 */ 242 protected function validate_field(field_controller $field) : field_controller { 243 if (!array_key_exists($field->get('categoryid'), $this->get_categories_with_fields())) { 244 throw new \moodle_exception('fieldnotfound', 'core_customfield'); 245 } 246 $category = $this->get_categories_with_fields()[$field->get('categoryid')]; 247 if (!array_key_exists($field->get('id'), $category->get_fields())) { 248 throw new \moodle_exception('fieldnotfound', 'core_customfield'); 249 } 250 return $category->get_fields()[$field->get('id')]; 251 } 252 253 /** 254 * Change name for a field category 255 * 256 * @param category_controller $category 257 * @param string $name 258 */ 259 public function rename_category(category_controller $category, string $name) { 260 $this->validate_category($category); 261 $category->set('name', $name); 262 api::save_category($category); 263 $this->clear_configuration_cache(); 264 } 265 266 /** 267 * Change sort order of the categories 268 * 269 * @param category_controller $category category that needs to be moved 270 * @param int $beforeid id of the category this category needs to be moved before, 0 to move to the end 271 */ 272 public function move_category(category_controller $category, int $beforeid = 0) { 273 $category = $this->validate_category($category); 274 api::move_category($category, $beforeid); 275 $this->clear_configuration_cache(); 276 } 277 278 /** 279 * Permanently delete category, all fields in it and all associated data 280 * 281 * @param category_controller $category 282 * @return bool 283 */ 284 public function delete_category(category_controller $category) : bool { 285 $category = $this->validate_category($category); 286 $result = api::delete_category($category); 287 $this->clear_configuration_cache(); 288 return $result; 289 } 290 291 /** 292 * Deletes all data and all fields and categories defined in this handler 293 */ 294 public function delete_all() { 295 $categories = $this->get_categories_with_fields(); 296 foreach ($categories as $category) { 297 api::delete_category($category); 298 } 299 $this->clear_configuration_cache(); 300 } 301 302 /** 303 * Permanently delete a custom field configuration and all associated data 304 * 305 * @param field_controller $field 306 * @return bool 307 */ 308 public function delete_field_configuration(field_controller $field) : bool { 309 $field = $this->validate_field($field); 310 $result = api::delete_field_configuration($field); 311 $this->clear_configuration_cache(); 312 return $result; 313 } 314 315 /** 316 * Change fields sort order, move field to another category 317 * 318 * @param field_controller $field field that needs to be moved 319 * @param int $categoryid category that needs to be moved 320 * @param int $beforeid id of the category this category needs to be moved before, 0 to move to the end 321 */ 322 public function move_field(field_controller $field, int $categoryid, int $beforeid = 0) { 323 $field = $this->validate_field($field); 324 api::move_field($field, $categoryid, $beforeid); 325 $this->clear_configuration_cache(); 326 } 327 328 /** 329 * The current user can configure custom fields on this component. 330 * 331 * @return bool 332 */ 333 abstract public function can_configure() : bool; 334 335 /** 336 * The current user can edit given custom fields on the given instance 337 * 338 * Called to filter list of fields displayed on the instance edit form 339 * 340 * Capability to edit/create instance is checked separately 341 * 342 * @param field_controller $field 343 * @param int $instanceid id of the instance or 0 if the instance is being created 344 * @return bool 345 */ 346 abstract public function can_edit(field_controller $field, int $instanceid = 0) : bool; 347 348 /** 349 * The current user can view the value of the custom field for a given custom field and instance 350 * 351 * Called to filter list of fields returned by methods get_instance_data(), get_instances_data(), 352 * export_instance_data(), export_instance_data_object() 353 * 354 * Access to the instance itself is checked by handler before calling these methods 355 * 356 * @param field_controller $field 357 * @param int $instanceid 358 * @return bool 359 */ 360 abstract public function can_view(field_controller $field, int $instanceid) : bool; 361 362 /** 363 * Returns the custom field values for an individual instance 364 * 365 * The caller must check access to the instance itself before invoking this method 366 * 367 * The result is an array of data_controller objects 368 * 369 * @param int $instanceid 370 * @param bool $returnall return data for all fields (by default only visible fields) 371 * @return data_controller[] array of data_controller objects indexed by fieldid. All fields are present, 372 * some data_controller objects may have 'id', some not 373 * In the last case data_controller::get_value() and export_value() functions will return default values. 374 */ 375 public function get_instance_data(int $instanceid, bool $returnall = false) : array { 376 $fields = $returnall ? $this->get_fields() : $this->get_visible_fields($instanceid); 377 return api::get_instance_fields_data($fields, $instanceid); 378 } 379 380 /** 381 * Returns the custom fields values for multiple instances 382 * 383 * The caller must check access to the instance itself before invoking this method 384 * 385 * The result is an array of data_controller objects 386 * 387 * @param int[] $instanceids 388 * @param bool $returnall return data for all fields (by default only visible fields) 389 * @return data_controller[][] 2-dimension array, first index is instanceid, second index is fieldid. 390 * All instanceids and all fieldids are present, some data_controller objects may have 'id', some not. 391 * In the last case data_controller::get_value() and export_value() functions will return default values. 392 */ 393 public function get_instances_data(array $instanceids, bool $returnall = false) : array { 394 $result = api::get_instances_fields_data($this->get_fields(), $instanceids); 395 396 if (!$returnall) { 397 // Filter only by visible fields (list of visible fields may be different for each instance). 398 $handler = $this; 399 foreach ($instanceids as $instanceid) { 400 $result[$instanceid] = array_filter($result[$instanceid], function(data_controller $d) use ($handler) { 401 return $handler->can_view($d->get_field(), $d->get('instanceid')); 402 }); 403 } 404 } 405 return $result; 406 } 407 408 /** 409 * Returns the custom field values for an individual instance ready to be displayed 410 * 411 * The caller must check access to the instance itself before invoking this method 412 * 413 * The result is an array of \core_customfield\output\field_data objects 414 * 415 * @param int $instanceid 416 * @param bool $returnall 417 * @return \core_customfield\output\field_data[] 418 */ 419 public function export_instance_data(int $instanceid, bool $returnall = false) : array { 420 return array_map(function($d) { 421 return new field_data($d); 422 }, $this->get_instance_data($instanceid, $returnall)); 423 } 424 425 /** 426 * Returns the custom field values for an individual instance ready to be displayed 427 * 428 * The caller must check access to the instance itself before invoking this method 429 * 430 * The result is a class where properties are fields short names and the values their export values for this instance 431 * 432 * @param int $instanceid 433 * @param bool $returnall 434 * @return stdClass 435 */ 436 public function export_instance_data_object(int $instanceid, bool $returnall = false) : stdClass { 437 $rv = new stdClass(); 438 foreach ($this->export_instance_data($instanceid, $returnall) as $d) { 439 $rv->{$d->get_shortname()} = $d->get_value(); 440 } 441 return $rv; 442 } 443 444 /** 445 * Display visible custom fields. 446 * This is a sample implementation that can be overridden in each handler. 447 * 448 * @param data_controller[] $fieldsdata 449 * @return string 450 */ 451 public function display_custom_fields_data(array $fieldsdata) : string { 452 global $PAGE; 453 $output = $PAGE->get_renderer('core_customfield'); 454 $content = ''; 455 foreach ($fieldsdata as $data) { 456 $fd = new field_data($data); 457 $content .= $output->render($fd); 458 } 459 460 return $content; 461 } 462 463 /** 464 * Returns array of categories, each of them contains a list of fields definitions. 465 * 466 * @return category_controller[] 467 */ 468 public function get_categories_with_fields() : array { 469 if ($this->categories === null) { 470 $this->categories = api::get_categories_with_fields($this->get_component(), $this->get_area(), $this->get_itemid()); 471 } 472 $handler = $this; 473 array_walk($this->categories, function(category_controller $c) use ($handler) { 474 $c->set_handler($handler); 475 }); 476 return $this->categories; 477 } 478 479 /** 480 * Clears a list of categories with corresponding fields definitions. 481 */ 482 protected function clear_configuration_cache() { 483 $this->categories = null; 484 } 485 486 /** 487 * Checks if current user can backup a given field 488 * 489 * Capability to backup the instance does not need to be checked here 490 * 491 * @param field_controller $field 492 * @param int $instanceid 493 * @return bool 494 */ 495 protected function can_backup(field_controller $field, int $instanceid) : bool { 496 return $this->can_view($field, $instanceid) || $this->can_edit($field, $instanceid); 497 } 498 499 /** 500 * Get raw data associated with all fields current user can view or edit 501 * 502 * @param int $instanceid 503 * @return array 504 */ 505 public function get_instance_data_for_backup(int $instanceid) : array { 506 $finalfields = []; 507 $data = $this->get_instance_data($instanceid, true); 508 foreach ($data as $d) { 509 if ($d->get('id') && $this->can_backup($d->get_field(), $instanceid)) { 510 $finalfields[] = [ 511 'id' => $d->get('id'), 512 'shortname' => $d->get_field()->get('shortname'), 513 'type' => $d->get_field()->get('type'), 514 'value' => $d->get_value(), 515 'valueformat' => $d->get('valueformat')]; 516 } 517 } 518 return $finalfields; 519 } 520 521 /** 522 * Form data definition callback. 523 * 524 * This method is called from moodleform::definition_after_data and allows to tweak 525 * mform with some data coming directly from the field plugin data controller. 526 * 527 * @param \MoodleQuickForm $mform 528 * @param int $instanceid 529 */ 530 public function instance_form_definition_after_data(\MoodleQuickForm $mform, int $instanceid = 0) { 531 $editablefields = $this->get_editable_fields($instanceid); 532 $fields = api::get_instance_fields_data($editablefields, $instanceid); 533 534 foreach ($fields as $formfield) { 535 $formfield->instance_form_definition_after_data($mform); 536 } 537 } 538 539 /** 540 * Prepares the custom fields data related to the instance to pass to mform->set_data() 541 * 542 * Example: 543 * $instance = $DB->get_record(...); 544 * // .... prepare editor, filemanager, add tags, etc. 545 * $handler->instance_form_before_set_data($instance); 546 * $form->set_data($instance); 547 * 548 * @param stdClass $instance the instance that has custom fields, if 'id' attribute is present the custom 549 * fields for this instance will be added, otherwise the default values will be added. 550 */ 551 public function instance_form_before_set_data(stdClass $instance) { 552 $instanceid = !empty($instance->id) ? $instance->id : 0; 553 $fields = api::get_instance_fields_data($this->get_editable_fields($instanceid), $instanceid); 554 555 foreach ($fields as $formfield) { 556 $formfield->instance_form_before_set_data($instance); 557 } 558 } 559 560 /** 561 * Saves the given data for custom fields, must be called after the instance is saved and id is present 562 * 563 * Example: 564 * if ($data = $form->get_data()) { 565 * // ... save main instance, set $data->id if instance was created. 566 * $handler->instance_form_save($data); 567 * redirect(...); 568 * } 569 * 570 * @param stdClass $instance data received from a form 571 * @param bool $isnewinstance if this is call is made during instance creation 572 */ 573 public function instance_form_save(stdClass $instance, bool $isnewinstance = false) { 574 if (empty($instance->id)) { 575 throw new \coding_exception('Caller must ensure that id is already set in data before calling this method'); 576 } 577 if (!preg_grep('/^customfield_/', array_keys((array)$instance))) { 578 // For performance. 579 return; 580 } 581 $editablefields = $this->get_editable_fields($isnewinstance ? 0 : $instance->id); 582 $fields = api::get_instance_fields_data($editablefields, $instance->id); 583 foreach ($fields as $data) { 584 if (!$data->get('id')) { 585 $data->set('contextid', $this->get_instance_context($instance->id)->id); 586 } 587 $data->instance_form_save($instance); 588 } 589 } 590 591 /** 592 * Validates the given data for custom fields, used in moodleform validation() function 593 * 594 * Example: 595 * public function validation($data, $files) { 596 * $errors = []; 597 * // .... check other fields. 598 * $errors = array_merge($errors, $handler->instance_form_validation($data, $files)); 599 * return $errors; 600 * } 601 * 602 * @param array $data 603 * @param array $files 604 * @return array validation errors 605 */ 606 public function instance_form_validation(array $data, array $files) { 607 $instanceid = empty($data['id']) ? 0 : $data['id']; 608 $editablefields = $this->get_editable_fields($instanceid); 609 $fields = api::get_instance_fields_data($editablefields, $instanceid); 610 $errors = []; 611 foreach ($fields as $formfield) { 612 $errors += $formfield->instance_form_validation($data, $files); 613 } 614 return $errors; 615 } 616 617 /** 618 * Adds custom fields to instance editing form 619 * 620 * Example: 621 * public function definition() { 622 * // ... normal instance definition, including hidden 'id' field. 623 * $handler->instance_form_definition($this->_form, $instanceid); 624 * $this->add_action_buttons(); 625 * } 626 * 627 * @param \MoodleQuickForm $mform 628 * @param int $instanceid id of the instance, can be null when instance is being created 629 * @param string $headerlangidentifier If specified, a lang string will be used for field category headings 630 * @param string $headerlangcomponent 631 */ 632 public function instance_form_definition(\MoodleQuickForm $mform, int $instanceid = 0, 633 ?string $headerlangidentifier = null, ?string $headerlangcomponent = null) { 634 635 $editablefields = $this->get_editable_fields($instanceid); 636 $fieldswithdata = api::get_instance_fields_data($editablefields, $instanceid); 637 $lastcategoryid = null; 638 foreach ($fieldswithdata as $data) { 639 $categoryid = $data->get_field()->get_category()->get('id'); 640 if ($categoryid != $lastcategoryid) { 641 $categoryname = $data->get_field()->get_category()->get_formatted_name(); 642 643 // Load category header lang string if specified. 644 if (!empty($headerlangidentifier)) { 645 $categoryname = get_string($headerlangidentifier, $headerlangcomponent, $categoryname); 646 } 647 648 $mform->addElement('header', 'category_' . $categoryid, $categoryname); 649 $lastcategoryid = $categoryid; 650 } 651 $data->instance_form_definition($mform); 652 $field = $data->get_field()->to_record(); 653 if (strlen($field->description)) { 654 // Add field description. 655 $context = $this->get_configuration_context(); 656 $value = file_rewrite_pluginfile_urls($field->description, 'pluginfile.php', 657 $context->id, 'core_customfield', 'description', $field->id); 658 $value = format_text($value, $field->descriptionformat, ['context' => $context]); 659 $mform->addElement('static', 'customfield_' . $field->shortname . '_static', '', $value); 660 } 661 } 662 } 663 664 /** 665 * Get field types array 666 * 667 * @return array 668 */ 669 public function get_available_field_types() :array { 670 return api::get_available_field_types(); 671 } 672 673 /** 674 * Options for processing embedded files in the field description. 675 * 676 * Handlers may want to extend it to disable files support and/or specify 'noclean'=>true 677 * Context is not necessary here 678 * 679 * @return array 680 */ 681 public function get_description_text_options() : array { 682 global $CFG; 683 require_once($CFG->libdir.'/formslib.php'); 684 return [ 685 'maxfiles' => EDITOR_UNLIMITED_FILES, 686 'maxbytes' => $CFG->maxbytes, 687 'context' => $this->get_configuration_context() 688 ]; 689 } 690 691 /** 692 * Save the field configuration with the data from the form 693 * 694 * @param field_controller $field 695 * @param stdClass $data data from the form 696 */ 697 public function save_field_configuration(field_controller $field, stdClass $data) { 698 if ($field->get('id')) { 699 $field = $this->validate_field($field); 700 } else { 701 $this->validate_category($field->get_category()); 702 } 703 api::save_field_configuration($field, $data); 704 $this->clear_configuration_cache(); 705 } 706 707 /** 708 * Creates or updates custom field data for a instanceid from backup data. 709 * 710 * The handlers have to override it if they support backup 711 * 712 * @param \restore_task $task 713 * @param array $data 714 */ 715 public function restore_instance_data_from_backup(\restore_task $task, array $data) { 716 throw new \coding_exception('Must be implemented in the handler'); 717 } 718 719 /** 720 * Returns list of fields defined for this instance as an array (not groupped by categories) 721 * 722 * Fields are sorted in the same order they would appear on the instance edit form 723 * 724 * Note that this function returns all fields in all categories regardless of whether the current user 725 * can view or edit data associated with them 726 * 727 * @return field_controller[] 728 */ 729 public function get_fields() : array { 730 $categories = $this->get_categories_with_fields(); 731 $fields = []; 732 foreach ($categories as $category) { 733 foreach ($category->get_fields() as $field) { 734 $fields[$field->get('id')] = $field; 735 } 736 } 737 return $fields; 738 } 739 740 /** 741 * Get visible fields 742 * 743 * @param int $instanceid 744 * @return field_controller[] 745 */ 746 protected function get_visible_fields(int $instanceid) : array { 747 $handler = $this; 748 return array_filter($this->get_fields(), 749 function($field) use($handler, $instanceid) { 750 return $handler->can_view($field, $instanceid); 751 } 752 ); 753 } 754 755 /** 756 * Get editable fields 757 * 758 * @param int $instanceid 759 * @return field_controller[] 760 */ 761 public function get_editable_fields(int $instanceid) : array { 762 $handler = $this; 763 return array_filter($this->get_fields(), 764 function($field) use($handler, $instanceid) { 765 return $handler->can_edit($field, $instanceid); 766 } 767 ); 768 } 769 770 /** 771 * Allows to add custom controls to the field configuration form that will be saved in configdata 772 * 773 * @param \MoodleQuickForm $mform 774 */ 775 public function config_form_definition(\MoodleQuickForm $mform) { 776 } 777 778 /** 779 * Deletes all data related to all fields of an instance. 780 * 781 * @param int $instanceid 782 */ 783 public function delete_instance(int $instanceid) { 784 $fielddata = api::get_instance_fields_data($this->get_fields(), $instanceid, false); 785 foreach ($fielddata as $data) { 786 $data->delete(); 787 } 788 } 789 }
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