message: Add missing UnitController
diff: @@ -49,6 +49,9 @@ export class UnitController {
  * "type": "free-text",
  * "__v": 0
  * }
  + *
  + * @apiError NotFoundError
  + * @apiError ForbiddenError
  */
  @Get('/:id')
  async getUnit(@Param('id') id: string, @CurrentUser() currentUser: IUser) {
  @@ -87,6 +90,7 @@ export class UnitController {
  * @apiError BadRequestError No unit was submitted.
  * @apiError BadRequestError Unit has no _course set.
  * @apiError BadRequestError
  + * @apiError ForbiddenError
  * @apiError ValidationError
  */
  @Authorized(['teacher', 'admin'])
  @@ -140,9 +144,10 @@ export class UnitController {
  * "__v": 0
  * }
  *
  - * @apiError NotFoundError
  * @apiError BadRequestError Invalid combination of file upload and unit data.
  * @apiError BadRequestError
  + * @apiError NotFoundError
  + * @apiError ForbiddenError
  * @apiError ValidationError
  */
  @Authorized(['teacher', 'admin'])
  @@ -180,6 +185,7 @@ export class UnitController {
  * }
  *
  * @apiError NotFoundError
  + * @apiError ForbiddenError
  */
  @Authorized(['teacher', 'admin'])
  @Delete('/:id')
  