Merge branch 'feature/90-accept_objects' of git.odit.services:lfk/backend into feature/90-accept_objects

# Conflicts:
#	src/models/actions/update/UpdatePermission.ts

src/models/actions/update/UpdatePermission.ts

@@ -1,4 +1,4 @@
-import { IsInt, IsNotEmpty, IsObject } from 'class-validator';
+import { IsInt, IsNotEmpty, IsPositive } from 'class-validator';
 import { getConnectionManager } from 'typeorm';
 import { PermissionNeedsPrincipalError } from '../../../errors/PermissionErrors';
 import { PrincipalNotFoundError } from '../../../errors/PrincipalErrors';
@@ -22,8 +22,8 @@ export class UpdatePermission {
     /**
      * The updated permissions's principal's id.
      */
-    @IsObject()
+    @IsInt()
-    @IsNotEmpty()
+    @IsPositive()
     principal: number;
 
     /**