/**
  * is executed, when the delete button is pressed
  *
  * @param viewCategory The category to delete
  */
 public async onDeleteButton(viewCategory: ViewCategory): Promise<void> {
     const title = this.translate.instant('Are you sure you want to delete this category?');
     const content = viewCategory.getTitle();
     if (await this.promptService.open(title, content)) {
         this.repo.delete(viewCategory).then(() => this.onCancelButton(), this.raiseError);
     }
 }

 /**
  * Saves a category
  * TODO: Some feedback
  *
  * @param viewCategory
  */
 public async onSaveButton(viewCategory: ViewCategory): Promise<void> {
     if (this.updateForm.dirty && this.updateForm.valid) {
         const cat: Partial<Category> = { name: this.updateForm.get('name').value };
         cat.prefix = this.updateForm.get('prefix').value || '';
         await this.repo.update(cat, viewCategory);
         this.updateForm.markAsPristine();
     }
 }

    /**
     * Creates a new category. Executed after hitting save.
     */
    public onCreateButton(): void {
        if (this.createForm.valid) {
            const cat: Partial<Category> = { name: this.createForm.get('name').value };
            if (this.createForm.get('prefix').value) {
                cat.prefix = this.createForm.get('prefix').value;
            }
            this.categoryToCreate.patchValues(cat);

            this.repo.create(this.categoryToCreate).then(() => (this.categoryToCreate = null), this.raiseError);
        }
    }

 /**
  * Opens a dialog and sets the category for all given motions.
  *
  * @param motions The motions to change
  */
 public async setCategory(motions: ViewMotion[]): Promise<void> {
     const title = this.translate.instant('This will set the following category for all selected motions:');
     const clearChoice = this.translate.instant('No category');
     const selectedChoice = await this.choiceService.open(
         title,
         this.categoryRepo.sortViewCategoriesByConfig(this.categoryRepo.getViewModelList()),
         false,
         null,
         clearChoice
     );
     if (selectedChoice) {
         for (const motion of motions) {
             await this.repo.update(
                 { category_id: selectedChoice.action ? null : (selectedChoice.items as number) },
                 motion
             );
         }
     }
 }

 /**
  * Init function.
  *
  * Sets the title and gets/observes categories from DataStore
  */
 public ngOnInit(): void {
     super.setTitle('Category');
     this.repo.getViewModelListObservable().subscribe(newViewCategories => {
         this.categories = newViewCategories;
     });
 }

 /**
  * is executed, when the delete button is pressed
  *
  * @param viewCategory The category to delete
  */
 public async onDeleteButton(viewCategory: ViewCategory): Promise<void> {
     const content = this.translate.instant('Delete') + ` ${viewCategory.name}?`;
     if (await this.promptService.open('Are you sure?', content)) {
         this.repo.delete(viewCategory).then(() => this.onCancelButton(), this.raiseError);
     }
 }