constructor(
     elementRef: ElementRef,
     private rest: Rest,
     public api: ApiUrl) {
     this.id = elementRef.nativeElement.getAttribute('id');
     this.wi = elementRef.nativeElement.getAttribute('wi');
     this.rest.get(this.api.workitem(this.id, this.wi)).subscribe(dto => this.onItemLoaded(dto));
 }

 loadList(grade: number): Observable<any[]> {
     if (grade !== 0) {
         return this.rest.get(`${this.api.list()}?grade=${grade}`);
     } else {
         return this.rest.get(`${this.api.list()}`);
     }
 }

 protected onOpening(): Observable<any> {
     this.schemeCourse = this.options.schemeCourse;
     this.startWeek = this.schemeCourse.startWeek;
     return this.rest.get('/api/core/departments?q=t').do((departments: any[]) => {
         this.department = departments.find(it => it.id === this.schemeCourse.departmentId);
     });
 }

 updateSettings(settings: RollcallSettings): Observable<void> {
     return this.rest.put(`${this.getSettingApi()}?type=settings`, settings).do(() => {
         this.settings.hideFree = settings.hideFree;
         this.settings.hideLeave = settings.hideLeave;
         this.settings.hideCancel = settings.hideCancel;
         this.settings.random = settings.random;
     });
 }

 protected onOpening(): Observable<any> {
     this.programSetting = {
         minLengthOfSchooling: this.options.programSetting.minLengthOfSchooling,
         maxLengthOfSchooling: this.options.programSetting.maxLengthOfSchooling,
         visionRevisible: this.options.programSetting.visionRevisible,
         practiceCreditRatio: this.options.programSetting.practiceCreditRatio,
         templateLocked: this.options.programSetting.templateLocked,
         schemeRevisible: this.options.programSetting.schemeRevisible,
         schemeExportable: this.options.programSetting.schemeExportable,
         templateId: this.options.programSetting.templateId,
         templateName: this.options.programSetting.templateName,
     };
     this.title = `设置 - ${this.options.programSetting.grade}级${this.options.programSetting.subjectName}`;
     return this.rest.get(this.options.url).do((data: any[]) => {
         this.template = data.find(it => it.id === this.programSetting.templateId);
     });
 }

 protected onOpening(): Observable<any> {
     this.programSetting = {
         visionRevisible: this.options.programSetting.visionRevisible,
         practiceCreditRatio: this.options.programSetting.practiceCreditRatio,
         templateLocked: this.options.programSetting.templateLocked,
         schemeRevisible: this.options.programSetting.schemeRevisible,
         schemeExportable: this.options.programSetting.schemeExportable,
         templateId: this.options.programSetting.templateId,
         templateName: this.options.programSetting.templateName,
     };
     this.title = `设置 - ${this.options.programSetting.grade}级${this.options.programSetting.subjectName}`;
     return this.rest.get(this.options.url).do((data: any[]) => {
         for (let i = 0; i < data.length; i++) {
             if (data[i].id === this.programSetting.templateId) {
                 this.template = data[i];
                 break;
             }
         }
     });
 }

 this.dialog.open(MentorSelectDialog).then(result => {
     this.rest.put(`${this.api.item(this.form.id)}`, {teacherId: result})
         .subscribe(() => this.form.paperApprover = result);
 });

 loadList() {
     return this.rest.get(this.api.list());
 }

 updateSecretary(subjectId: string, secretaryId: string): Observable<void> {
     return this.rest.put(this.api.item(subjectId), {secretaryId});
 }

 loadList(): Observable<any[]> {
     return this.rest.get(this.api.list());
 }