course/edit_form.php

   1 <?php
   2
   3 defined('MOODLE_INTERNAL') || die;
   4
   5 require_once($CFG->libdir.'/formslib.php');
   6 require_once($CFG->libdir.'/completionlib.php');
   7 require_once($CFG->libdir . '/pdflib.php');
   8
   9 /**
  10  * The form for handling editing a course.
  11  */
  12 class course_edit_form extends moodleform {
  13     protected $course;
  14     protected $context;
  15
  16     /**
  17      * Form definition.
  18      */
  19     function definition() {
  20         global $CFG, $PAGE;
  21
  22         $mform    = $this->_form;
  23         $PAGE->requires->js_call_amd('core_course/formatchooser', 'init');
  24
  25         $course        = $this->_customdata['course']; // this contains the data of this form
  26         $category      = $this->_customdata['category'];
  27         $editoroptions = $this->_customdata['editoroptions'];
  28         $returnto = $this->_customdata['returnto'];
  29         $returnurl = $this->_customdata['returnurl'];
  30
  31         $systemcontext   = context_system::instance();
  32         $categorycontext = context_coursecat::instance($category->id);
  33
  34         if (!empty($course->id)) {
  35             $coursecontext = context_course::instance($course->id);
  36             $context = $coursecontext;
  37         } else {
  38             $coursecontext = null;
  39             $context = $categorycontext;
  40         }
  41
  42         $courseconfig = get_config('moodlecourse');
  43
  44         $this->course  = $course;
  45         $this->context = $context;
  46
  47         // Form definition with new course defaults.
  48         $mform->addElement('header','general', get_string('general', 'form'));
  49
  50         $mform->addElement('hidden', 'returnto', null);
  51         $mform->setType('returnto', PARAM_ALPHANUM);
  52         $mform->setConstant('returnto', $returnto);
  53
  54         $mform->addElement('hidden', 'returnurl', null);
  55         $mform->setType('returnurl', PARAM_LOCALURL);
  56         $mform->setConstant('returnurl', $returnurl);
  57
  58         $mform->addElement('text','fullname', get_string('fullnamecourse'),'maxlength="254" size="50"');
  59         $mform->addHelpButton('fullname', 'fullnamecourse');
  60         $mform->addRule('fullname', get_string('missingfullname'), 'required', null, 'client');
  61         $mform->setType('fullname', PARAM_TEXT);
  62         if (!empty($course->id) and !has_capability('moodle/course:changefullname', $coursecontext)) {
  63             $mform->hardFreeze('fullname');
  64             $mform->setConstant('fullname', $course->fullname);
  65         }
  66
  67         $mform->addElement('text', 'shortname', get_string('shortnamecourse'), 'maxlength="100" size="20"');
  68         $mform->addHelpButton('shortname', 'shortnamecourse');
  69         $mform->addRule('shortname', get_string('missingshortname'), 'required', null, 'client');
  70         $mform->setType('shortname', PARAM_TEXT);
  71         if (!empty($course->id) and !has_capability('moodle/course:changeshortname', $coursecontext)) {
  72             $mform->hardFreeze('shortname');
  73             $mform->setConstant('shortname', $course->shortname);
  74         }
  75
  76         // Verify permissions to change course category or keep current.
  77         if (empty($course->id)) {
  78             if (has_capability('moodle/course:create', $categorycontext)) {
  79                 $displaylist = core_course_category::make_categories_list('moodle/course:create');
  80                 $mform->addElement('autocomplete', 'category', get_string('coursecategory'), $displaylist);
  81                 $mform->addRule('category', null, 'required', null, 'client');
  82                 $mform->addHelpButton('category', 'coursecategory');
  83                 $mform->setDefault('category', $category->id);
  84             } else {
  85                 $mform->addElement('hidden', 'category', null);
  86                 $mform->setType('category', PARAM_INT);
  87                 $mform->setConstant('category', $category->id);
  88             }
  89         } else {
  90             if (has_capability('moodle/course:changecategory', $coursecontext)) {
  91                 $displaylist = core_course_category::make_categories_list('moodle/course:changecategory');
  92                 if (!isset($displaylist[$course->category])) {
  93                     //always keep current
  94                     $displaylist[$course->category] = core_course_category::get($course->category, MUST_EXIST, true)
  95                         ->get_formatted_name();
  96                 }
  97                 $mform->addElement('autocomplete', 'category', get_string('coursecategory'), $displaylist);
  98                 $mform->addRule('category', null, 'required', null, 'client');
  99                 $mform->addHelpButton('category', 'coursecategory');
 100             } else {
 101                 //keep current
 102                 $mform->addElement('hidden', 'category', null);
 103                 $mform->setType('category', PARAM_INT);
 104                 $mform->setConstant('category', $course->category);
 105             }
 106         }
 107
 108         $choices = array();
 109         $choices['0'] = get_string('hide');
 110         $choices['1'] = get_string('show');
 111         $mform->addElement('select', 'visible', get_string('coursevisibility'), $choices);
 112         $mform->addHelpButton('visible', 'coursevisibility');
 113         $mform->setDefault('visible', $courseconfig->visible);
 114         if (!empty($course->id)) {
 115             if (!has_capability('moodle/course:visibility', $coursecontext)) {
 116                 $mform->hardFreeze('visible');
 117                 $mform->setConstant('visible', $course->visible);
 118             }
 119         } else {
 120             if (!guess_if_creator_will_have_course_capability('moodle/course:visibility', $categorycontext)) {
 121                 $mform->hardFreeze('visible');
 122                 $mform->setConstant('visible', $courseconfig->visible);
 123             }
 124         }
 125
 126         // Download course content.
 127         if ($CFG->downloadcoursecontentallowed) {
 128             $downloadchoices = [
 129                 DOWNLOAD_COURSE_CONTENT_DISABLED => get_string('no'),
 130                 DOWNLOAD_COURSE_CONTENT_ENABLED => get_string('yes'),
 131             ];
 132             $sitedefaultstring = $downloadchoices[$courseconfig->downloadcontentsitedefault];
 133             $downloadchoices[DOWNLOAD_COURSE_CONTENT_SITE_DEFAULT] = get_string('sitedefaultspecified', '', $sitedefaultstring);
 134             $downloadselectdefault = $courseconfig->downloadcontent ?? DOWNLOAD_COURSE_CONTENT_SITE_DEFAULT;
 135
 136             $mform->addElement('select', 'downloadcontent', get_string('enabledownloadcoursecontent', 'course'), $downloadchoices);
 137             $mform->addHelpButton('downloadcontent', 'downloadcoursecontent', 'course');
 138             $mform->setDefault('downloadcontent', $downloadselectdefault);
 139
 140             if ((!empty($course->id) && !has_capability('moodle/course:configuredownloadcontent', $coursecontext)) ||
 141                     (empty($course->id) &&
 142                     !guess_if_creator_will_have_course_capability('moodle/course:configuredownloadcontent', $categorycontext))) {
 143                 $mform->hardFreeze('downloadcontent');
 144                 $mform->setConstant('downloadcontent', $downloadselectdefault);
 145             }
 146         }
 147
 148         // Get the task to change automatically the course visibility when the current day matches the course start date.
 149         $task = \core\task\manager::get_scheduled_task('\core\task\show_started_courses_task');
 150         $startdatestring = 'startdate';
 151         if (!empty($task) && !$task->get_disabled()) {
 152             // When the task is enabled, display a different help message.
 153             $startdatestring = 'startdatewithtaskenabled';
 154         }
 155         $mform->addElement('date_time_selector', 'startdate', get_string('startdate'));
 156         $mform->addHelpButton('startdate', $startdatestring);
 157         $date = (new DateTime())->setTimestamp(usergetmidnight(time()));
 158         $date->modify('+1 day');
 159         $mform->setDefault('startdate', $date->getTimestamp());
 160
 161         // Get the task to change automatically the course visibility when the current day matches the course end date.
 162         $task = \core\task\manager::get_scheduled_task('\core\task\hide_ended_courses_task');
 163         $enddatestring = 'enddate';
 164         if (!empty($task) && !$task->get_disabled()) {
 165             // When the task is enabled, display a different help message.
 166             $enddatestring = 'enddatewithtaskenabled';
 167         }
 168         $mform->addElement('date_time_selector', 'enddate', get_string('enddate'), array('optional' => true));
 169         $mform->addHelpButton('enddate', $enddatestring);
 170
 171         if (!empty($CFG->enablecourserelativedates)) {
 172             $attributes = [
 173                 'aria-describedby' => 'relativedatesmode_warning'
 174             ];
 175             if (!empty($course->id)) {
 176                 $attributes['disabled'] = true;
 177             }
 178             $relativeoptions = [
 179                 0 => get_string('no'),
 180                 1 => get_string('yes'),
 181             ];
 182             $relativedatesmodegroup = [];
 183             $relativedatesmodegroup[] = $mform->createElement('select', 'relativedatesmode', get_string('relativedatesmode'),
 184                 $relativeoptions, $attributes);
 185             $relativedatesmodegroup[] = $mform->createElement('html', html_writer::span(get_string('relativedatesmode_warning'),
 186                 '', ['id' => 'relativedatesmode_warning']));
 187             $mform->addGroup($relativedatesmodegroup, 'relativedatesmodegroup', get_string('relativedatesmode'), null, false);
 188             $mform->addHelpButton('relativedatesmodegroup', 'relativedatesmode');
 189         }
 190
 191         $mform->addElement('text','idnumber', get_string('idnumbercourse'),'maxlength="100"  size="10"');
 192         $mform->addHelpButton('idnumber', 'idnumbercourse');
 193         $mform->setType('idnumber', PARAM_RAW);
 194         if (!empty($course->id) and !has_capability('moodle/course:changeidnumber', $coursecontext)) {
 195             $mform->hardFreeze('idnumber');
 196             $mform->setConstants('idnumber', $course->idnumber);
 197         }
 198
 199         // Description.
 200         $mform->addElement('header', 'descriptionhdr', get_string('description'));
 201         $mform->setExpanded('descriptionhdr');
 202
 203         $mform->addElement('editor','summary_editor', get_string('coursesummary'), null, $editoroptions);
 204         $mform->addHelpButton('summary_editor', 'coursesummary');
 205         $mform->setType('summary_editor', PARAM_RAW);
 206         $summaryfields = 'summary_editor';
 207
 208         if ($overviewfilesoptions = course_overviewfiles_options($course)) {
 209             $mform->addElement('filemanager', 'overviewfiles_filemanager', get_string('courseoverviewfiles'), null, $overviewfilesoptions);
 210             $mform->addHelpButton('overviewfiles_filemanager', 'courseoverviewfiles');
 211             $summaryfields .= ',overviewfiles_filemanager';
 212         }
 213
 214         if (!empty($course->id) and !has_capability('moodle/course:changesummary', $coursecontext)) {
 215             // Remove the description header it does not contain anything any more.
 216             $mform->removeElement('descriptionhdr');
 217             $mform->hardFreeze($summaryfields);
 218         }
 219
 220         // Course format.
 221         $mform->addElement('header', 'courseformathdr', get_string('type_format', 'plugin'));
 222
 223         $courseformats = get_sorted_course_formats(true);
 224         $formcourseformats = new core\output\choicelist();
 225         $formcourseformats->set_allow_empty(false);
 226         foreach ($courseformats as $courseformat) {
 227             $definition = [];
 228             $component = "format_$courseformat";
 229             if (get_string_manager()->string_exists('plugin_description', $component)) {
 230                 $definition['description'] = get_string('plugin_description', $component);
 231             }
 232             $formcourseformats->add_option(
 233                 $courseformat,
 234                 get_string('pluginname', "format_$courseformat"),
 235                 [
 236                     'description' => $definition,
 237                 ],
 238             );
 239         }
 240         if (isset($course->format)) {
 241             $course->format = course_get_format($course)->get_format(); // Replace with default if not found.
 242             if (!in_array($course->format, $courseformats)) {
 243                 // This format is disabled. Still display it in the dropdown.
 244                 $formcourseformats->add_option(
 245                     $course->format,
 246                     get_string('withdisablednote', 'moodle', get_string('pluginname', 'format_'.$course->format)),
 247                 );
 248             }
 249         }
 250
 251         $mform->addElement(
 252             'choicedropdown',
 253             'format',
 254             get_string('format'),
 255             $formcourseformats,
 256             ['data-formatchooser-field' => 'selector'],
 257         );
 258         $mform->setDefault('format', $courseconfig->format);
 259
 260         // Button to update format-specific options on format change (will be hidden by JavaScript).
 261         $mform->registerNoSubmitButton('updatecourseformat');
 262         $mform->addElement('submit', 'updatecourseformat', get_string('courseformatudpate'), [
 263             'data-formatchooser-field' => 'updateButton',
 264             'class' => 'd-none',
 265         ]);
 266
 267         // Just a placeholder for the course format options.
 268         $mform->addElement('hidden', 'addcourseformatoptionshere');
 269         $mform->setType('addcourseformatoptionshere', PARAM_BOOL);
 270
 271         // Appearance.
 272         $mform->addElement('header', 'appearancehdr', get_string('appearance'));
 273
 274         if (!empty($CFG->allowcoursethemes)) {
 275             $themeobjects = get_list_of_themes();
 276             $themes=array();
 277             $themes[''] = get_string('forceno');
 278             foreach ($themeobjects as $key=>$theme) {
 279                 if (empty($theme->hidefromselector)) {
 280                     $themes[$key] = get_string('pluginname', 'theme_'.$theme->name);
 281                 }
 282             }
 283             $mform->addElement('select', 'theme', get_string('forcetheme'), $themes);
 284         }
 285
 286         if ((empty($course->id) && guess_if_creator_will_have_course_capability('moodle/course:setforcedlanguage', $categorycontext))
 287                 || (!empty($course->id) && has_capability('moodle/course:setforcedlanguage', $coursecontext))) {
 288
 289             $languages = ['' => get_string('forceno')];
 290             $languages += get_string_manager()->get_list_of_translations();
 291
 292             $mform->addElement('select', 'lang', get_string('forcelanguage'), $languages);
 293             $mform->setDefault('lang', $courseconfig->lang);
 294         }
 295
 296         // Multi-Calendar Support - see MDL-18375.
 297         $calendartypes = \core_calendar\type_factory::get_list_of_calendar_types();
 298         // We do not want to show this option unless there is more than one calendar type to display.
 299         if (count($calendartypes) > 1) {
 300             $calendars = array();
 301             $calendars[''] = get_string('forceno');
 302             $calendars += $calendartypes;
 303             $mform->addElement('select', 'calendartype', get_string('forcecalendartype', 'calendar'), $calendars);
 304         }
 305
 306         $options = range(0, 10);
 307         $mform->addElement('select', 'newsitems', get_string('newsitemsnumber'), $options);
 308         $courseconfig = get_config('moodlecourse');
 309         $mform->setDefault('newsitems', $courseconfig->newsitems);
 310         $mform->addHelpButton('newsitems', 'newsitemsnumber');
 311
 312         $mform->addElement('selectyesno', 'showgrades', get_string('showgrades'));
 313         $mform->addHelpButton('showgrades', 'showgrades');
 314         $mform->setDefault('showgrades', $courseconfig->showgrades);
 315
 316         $mform->addElement('selectyesno', 'showreports', get_string('showreports'));
 317         $mform->addHelpButton('showreports', 'showreports');
 318         $mform->setDefault('showreports', $courseconfig->showreports);
 319
 320         // Show activity dates.
 321         $mform->addElement('selectyesno', 'showactivitydates', get_string('showactivitydates'));
 322         $mform->addHelpButton('showactivitydates', 'showactivitydates');
 323         $mform->setDefault('showactivitydates', $courseconfig->showactivitydates);
 324
 325         // Files and uploads.
 326         $mform->addElement('header', 'filehdr', get_string('filesanduploads'));
 327
 328         if (!empty($course->legacyfiles) or !empty($CFG->legacyfilesinnewcourses)) {
 329             if (empty($course->legacyfiles)) {
 330                 //0 or missing means no legacy files ever used in this course - new course or nobody turned on legacy files yet
 331                 $choices = array('0'=>get_string('no'), '2'=>get_string('yes'));
 332             } else {
 333                 $choices = array('1'=>get_string('no'), '2'=>get_string('yes'));
 334             }
 335             $mform->addElement('select', 'legacyfiles', get_string('courselegacyfiles'), $choices);
 336             $mform->addHelpButton('legacyfiles', 'courselegacyfiles');
 337             if (!isset($courseconfig->legacyfiles)) {
 338                 // in case this was not initialised properly due to switching of $CFG->legacyfilesinnewcourses
 339                 $courseconfig->legacyfiles = 0;
 340             }
 341             $mform->setDefault('legacyfiles', $courseconfig->legacyfiles);
 342         }
 343
 344         // Handle non-existing $course->maxbytes on course creation.
 345         $coursemaxbytes = !isset($course->maxbytes) ? null : $course->maxbytes;
 346
 347         // Let's prepare the maxbytes popup.
 348         $choices = get_max_upload_sizes($CFG->maxbytes, 0, 0, $coursemaxbytes);
 349         $mform->addElement('select', 'maxbytes', get_string('maximumupload'), $choices);
 350         $mform->addHelpButton('maxbytes', 'maximumupload');
 351         $mform->setDefault('maxbytes', $courseconfig->maxbytes);
 352
 353         // PDF font.
 354         if (!empty($CFG->enablepdfexportfont)) {
 355             $pdf = new \pdf;
 356             $fontlist = $pdf->get_export_fontlist();
 357             // Show the option if the font is defined more than one.
 358             if (count($fontlist) > 1) {
 359                 $defaultfont = $courseconfig->pdfexportfont ?? 'freesans';
 360                 if (empty($fontlist[$defaultfont])) {
 361                     $defaultfont = current($fontlist);
 362                 }
 363                 $mform->addElement('select', 'pdfexportfont', get_string('pdfexportfont', 'course'), $fontlist);
 364                 $mform->addHelpButton('pdfexportfont', 'pdfexportfont', 'course');
 365                 $mform->setDefault('pdfexportfont', $defaultfont);
 366             }
 367         }
 368
 369         // Completion tracking.
 370         if (completion_info::is_enabled_for_site()) {
 371             $mform->addElement('header', 'completionhdr', get_string('completion', 'completion'));
 372             $mform->addElement('selectyesno', 'enablecompletion', get_string('enablecompletion', 'completion'));
 373             $mform->setDefault('enablecompletion', $courseconfig->enablecompletion);
 374             $mform->addHelpButton('enablecompletion', 'enablecompletion', 'completion');
 375
 376             $showcompletionconditions = $courseconfig->showcompletionconditions ?? COMPLETION_SHOW_CONDITIONS;
 377             $mform->addElement('selectyesno', 'showcompletionconditions', get_string('showcompletionconditions', 'completion'));
 378             $mform->addHelpButton('showcompletionconditions', 'showcompletionconditions', 'completion');
 379             $mform->setDefault('showcompletionconditions', $showcompletionconditions);
 380             $mform->hideIf('showcompletionconditions', 'enablecompletion', 'eq', COMPLETION_DISABLED);
 381         } else {
 382             $mform->addElement('hidden', 'enablecompletion');
 383             $mform->setType('enablecompletion', PARAM_INT);
 384             $mform->setDefault('enablecompletion', 0);
 385         }
 386
 387         enrol_course_edit_form($mform, $course, $context);
 388
 389         $mform->addElement('header','groups', get_string('groupsettingsheader', 'group'));
 390
 391         $choices = array();
 392         $choices[NOGROUPS] = get_string('groupsnone', 'group');
 393         $choices[SEPARATEGROUPS] = get_string('groupsseparate', 'group');
 394         $choices[VISIBLEGROUPS] = get_string('groupsvisible', 'group');
 395         $mform->addElement('select', 'groupmode', get_string('groupmode', 'group'), $choices);
 396         $mform->addHelpButton('groupmode', 'groupmode', 'group');
 397         $mform->setDefault('groupmode', $courseconfig->groupmode);
 398
 399         $mform->addElement('selectyesno', 'groupmodeforce', get_string('groupmodeforce', 'group'));
 400         $mform->addHelpButton('groupmodeforce', 'groupmodeforce', 'group');
 401         $mform->setDefault('groupmodeforce', $courseconfig->groupmodeforce);
 402
 403         //default groupings selector
 404         $options = array();
 405         $options[0] = get_string('none');
 406         $mform->addElement('select', 'defaultgroupingid', get_string('defaultgrouping', 'group'), $options);
 407
 408         if (core_tag_tag::is_enabled('core', 'course') &&
 409                 ((empty($course->id) && guess_if_creator_will_have_course_capability('moodle/course:tag', $categorycontext))
 410                 || (!empty($course->id) && has_capability('moodle/course:tag', $coursecontext)))) {
 411             $mform->addElement('header', 'tagshdr', get_string('tags', 'tag'));
 412             $mform->addElement('tags', 'tags', get_string('tags'),
 413                     array('itemtype' => 'course', 'component' => 'core'));
 414         }
 415
 416         // Add custom fields to the form.
 417         $handler = core_course\customfield\course_handler::create();
 418         $handler->set_parent_context($categorycontext); // For course handler only.
 419         $handler->instance_form_definition($mform, empty($course->id) ? 0 : $course->id);
 420
 421         $hook = new \core_course\hook\after_form_definition($this, $mform);
 422         \core\hook\manager::get_instance()->dispatch($hook);
 423
 424         // When two elements we need a group.
 425         $buttonarray = array();
 426         $classarray = array('class' => 'form-submit');
 427         if ($returnto !== 0) {
 428             $buttonarray[] = &$mform->createElement('submit', 'saveandreturn', get_string('savechangesandreturn'), $classarray);
 429         }
 430         $buttonarray[] = &$mform->createElement('submit', 'saveanddisplay', get_string('savechangesanddisplay'), $classarray);
 431         $buttonarray[] = &$mform->createElement('cancel');
 432         $mform->addGroup($buttonarray, 'buttonar', '', array(' '), false);
 433         $mform->closeHeaderBefore('buttonar');
 434
 435         $mform->addElement('hidden', 'id', null);
 436         $mform->setType('id', PARAM_INT);
 437
 438         // Prepare custom fields data.
 439         $handler->instance_form_before_set_data($course);
 440         // Finally set the current form data
 441         $this->set_data($course);
 442     }
 443
 444     /**
 445      * Fill in the current page data for this course.
 446      */
 447     function definition_after_data() {
 448         global $DB;
 449
 450         $mform = $this->_form;
 451
 452         // add available groupings
 453         $courseid = $mform->getElementValue('id');
 454         if ($courseid and $mform->elementExists('defaultgroupingid')) {
 455             $options = array();
 456             if ($groupings = $DB->get_records('groupings', array('courseid'=>$courseid))) {
 457                 foreach ($groupings as $grouping) {
 458                     $options[$grouping->id] = format_string($grouping->name);
 459                 }
 460             }
 461             core_collator::asort($options);
 462             $gr_el =& $mform->getElement('defaultgroupingid');
 463             $gr_el->load($options);
 464         }
 465
 466         // add course format options
 467         $formatvalue = $mform->getElementValue('format');
 468         if (is_array($formatvalue) && !empty($formatvalue)) {
 469
 470             $params = array('format' => $formatvalue[0]);
 471             // Load the course as well if it is available, course formats may need it to work out
 472             // they preferred course end date.
 473             if ($courseid) {
 474                 $params['id'] = $courseid;
 475             }
 476             $courseformat = course_get_format((object)$params);
 477
 478             $elements = $courseformat->create_edit_form_elements($mform);
 479             for ($i = 0; $i < count($elements); $i++) {
 480                 $mform->insertElementBefore($mform->removeElement($elements[$i]->getName(), false),
 481                         'addcourseformatoptionshere');
 482             }
 483
 484             // Remove newsitems element if format does not support news.
 485             if (!$courseformat->supports_news()) {
 486                 $mform->removeElement('newsitems');
 487             }
 488         }
 489
 490         // Tweak the form with values provided by custom fields in use.
 491         $handler  = core_course\customfield\course_handler::create();
 492         $handler->instance_form_definition_after_data($mform, empty($courseid) ? 0 : $courseid);
 493
 494         $hook = new \core_course\hook\after_form_definition_after_data($this, $mform);
 495         \core\hook\manager::get_instance()->dispatch($hook);
 496     }
 497
 498     /**
 499      * Validation.
 500      *
 501      * @param array $data
 502      * @param array $files
 503      * @return array the errors that were found
 504      */
 505     function validation($data, $files) {
 506         global $DB;
 507
 508         $errors = parent::validation($data, $files);
 509
 510         // Add field validation check for duplicate shortname.
 511         if ($course = $DB->get_record('course', array('shortname' => $data['shortname']), '*', IGNORE_MULTIPLE)) {
 512             if (empty($data['id']) || $course->id != $data['id']) {
 513                 $errors['shortname'] = get_string('shortnametaken', '', $course->fullname);
 514             }
 515         }
 516
 517         // Add field validation check for duplicate idnumber.
 518         if (!empty($data['idnumber']) && (empty($data['id']) || $this->course->idnumber != $data['idnumber'])) {
 519             if ($course = $DB->get_record('course', array('idnumber' => $data['idnumber']), '*', IGNORE_MULTIPLE)) {
 520                 if (empty($data['id']) || $course->id != $data['id']) {
 521                     $errors['idnumber'] = get_string('courseidnumbertaken', 'error', $course->fullname);
 522                 }
 523             }
 524         }
 525
 526         if ($errorcode = course_validate_dates($data)) {
 527             $errors['enddate'] = get_string($errorcode, 'error');
 528         }
 529
 530         $errors = array_merge($errors, enrol_course_edit_validation($data, $this->context));
 531
 532         $courseformat = course_get_format((object)array('format' => $data['format']));
 533         $formaterrors = $courseformat->edit_form_validation($data, $files, $errors);
 534         if (!empty($formaterrors) && is_array($formaterrors)) {
 535             $errors = array_merge($errors, $formaterrors);
 536         }
 537
 538         // Add the custom fields validation.
 539         $handler = core_course\customfield\course_handler::create();
 540         $errors  = array_merge($errors, $handler->instance_form_validation($data, $files));
 541
 542         $hook = new \core_course\hook\after_form_validation($this, $data, $files);
 543         \core\hook\manager::get_instance()->dispatch($hook);
 544         $pluginerrors = $hook->get_errors();
 545         if (!empty($pluginerrors)) {
 546             $errors = array_merge($errors, $pluginerrors);
 547         }
 548
 549         return $errors;
 550     }
 551
 552     /**
 553      * Returns course object.
 554      *
 555      * @return \stdClass
 556      */
 557     public function get_course(): stdClass {
 558         return $this->course;
 559     }
 560
 561     /**
 562      * Returns context.
 563      *
 564      * @return \core\context
 565      */
 566     public function get_context(): \core\context {
 567         return $this->context;
 568     }
 569 }