From 467cd3dcc95ebafdf55d023ae568f06d1d902eb6 Mon Sep 17 00:00:00 2001
From: IRBorisov <8611739+IRBorisov@users.noreply.github.com>
Date: Sun, 26 May 2024 00:46:58 +0300
Subject: [PATCH] Implement backend for permission management

---
 .../backend/apps/rsform/models/Editor.py      |  27 ++-
 .../backend/apps/rsform/models/LibraryItem.py |   2 +-
 .../apps/rsform/serializers/__init__.py       |   2 +
 .../apps/rsform/serializers/data_access.py    |  10 ++
 .../rsform/tests/s_models/t_Constituenta.py   |   2 +-
 .../apps/rsform/tests/s_models/t_Editor.py    |  30 +++-
 .../rsform/tests/s_models/t_LibraryItem.py    |   2 +-
 .../apps/rsform/tests/s_models/t_RSForm.py    |   2 +-
 .../rsform/tests/s_views/EndpointTester.py    |   9 +-
 .../apps/rsform/tests/s_views/t_cctext.py     |   6 +-
 .../rsform/tests/s_views/t_constituents.py    |  23 +--
 .../apps/rsform/tests/s_views/t_library.py    | 163 +++++++++++++++---
 .../apps/rsform/tests/s_views/t_operations.py |  43 +++--
 .../apps/rsform/tests/s_views/t_rsforms.py    |  87 +++++-----
 .../apps/rsform/tests/s_views/t_rslang.py     |   5 +-
 .../apps/rsform/tests/s_views/t_versions.py   |  30 ++--
 .../backend/apps/rsform/views/library.py      |  97 ++++++++++-
 .../backend/apps/rsform/views/rsforms.py      |   6 +-
 18 files changed, 392 insertions(+), 154 deletions(-)

diff --git a/rsconcept/backend/apps/rsform/models/Editor.py b/rsconcept/backend/apps/rsform/models/Editor.py
index b3849867..2f9ce6a0 100644
--- a/rsconcept/backend/apps/rsform/models/Editor.py
+++ b/rsconcept/backend/apps/rsform/models/Editor.py
@@ -1,6 +1,7 @@
 ''' Models: Editor. '''
 from typing import TYPE_CHECKING
 
+from django.db import transaction
 from django.db.models import CASCADE, DateTimeField, ForeignKey, Model
 
 from apps.users.models import User
@@ -37,18 +38,34 @@ class Editor(Model):
         return f'{self.item}: {self.editor}'
 
     @staticmethod
-    def add(user: User, item: 'LibraryItem') -> bool:
+    def add(item: 'LibraryItem', user: User) -> bool:
         ''' Add Editor for item. '''
-        if Editor.objects.filter(editor=user, item=item).exists():
+        if Editor.objects.filter(item=item, editor=user).exists():
             return False
-        Editor.objects.create(editor=user, item=item)
+        Editor.objects.create(item=item, editor=user)
         return True
 
     @staticmethod
-    def remove(user: User, item: 'LibraryItem') -> bool:
+    def remove(item: 'LibraryItem', user: User) -> bool:
         ''' Remove Editor. '''
-        editor = Editor.objects.filter(editor=user, item=item)
+        editor = Editor.objects.filter(item=item, editor=user)
         if not editor.exists():
             return False
         editor.delete()
         return True
+
+    @staticmethod
+    @transaction.atomic
+    def set(item: 'LibraryItem', users: list[User]):
+        ''' Set editors for item. '''
+        processed: list[User] = []
+        for editor_item in Editor.objects.filter(item=item):
+            if not editor_item.editor in users:
+                editor_item.delete()
+            else:
+                processed.append(editor_item.editor)
+
+        for user in users:
+            if not user in processed:
+                processed.append(user)
+                Editor.objects.create(item=item, editor=user)
diff --git a/rsconcept/backend/apps/rsform/models/LibraryItem.py b/rsconcept/backend/apps/rsform/models/LibraryItem.py
index 4154080a..a4a6ccdd 100644
--- a/rsconcept/backend/apps/rsform/models/LibraryItem.py
+++ b/rsconcept/backend/apps/rsform/models/LibraryItem.py
@@ -87,7 +87,7 @@ class LibraryItem(Model):
 
     def editors(self) -> list[Editor]:
         ''' Get all Editors of this item. '''
-        return [item.editor for item in Editor.objects.filter(item=self.pk).order_by('-time_create')]
+        return [item.editor for item in Editor.objects.filter(item=self.pk)]
 
     @transaction.atomic
     def save(self, *args, **kwargs):
diff --git a/rsconcept/backend/apps/rsform/serializers/__init__.py b/rsconcept/backend/apps/rsform/serializers/__init__.py
index c8534511..a9840e63 100644
--- a/rsconcept/backend/apps/rsform/serializers/__init__.py
+++ b/rsconcept/backend/apps/rsform/serializers/__init__.py
@@ -22,6 +22,8 @@ from .data_access import (
     LibraryItemSerializer,
     RSFormParseSerializer,
     RSFormSerializer,
+    UsersListSerializer,
+    UserTargetSerializer,
     VersionCreateSerializer,
     VersionSerializer
 )
diff --git a/rsconcept/backend/apps/rsform/serializers/data_access.py b/rsconcept/backend/apps/rsform/serializers/data_access.py
index fe8c9ee4..078fa000 100644
--- a/rsconcept/backend/apps/rsform/serializers/data_access.py
+++ b/rsconcept/backend/apps/rsform/serializers/data_access.py
@@ -272,6 +272,16 @@ class CstTargetSerializer(serializers.Serializer):
         return attrs
 
 
+class UserTargetSerializer(serializers.Serializer):
+    ''' Serializer: Target single User. '''
+    user = PKField(many=False, queryset=User.objects.all())
+
+
+class UsersListSerializer(serializers.Serializer):
+    ''' Serializer: List of Users. '''
+    users = PKField(many=True, queryset=User.objects.all())
+
+
 class CstRenameSerializer(serializers.Serializer):
     ''' Serializer: Constituenta renaming. '''
     target = PKField(many=False, queryset=Constituenta.objects.all())
diff --git a/rsconcept/backend/apps/rsform/tests/s_models/t_Constituenta.py b/rsconcept/backend/apps/rsform/tests/s_models/t_Constituenta.py
index fe22be46..ad0ca54b 100644
--- a/rsconcept/backend/apps/rsform/tests/s_models/t_Constituenta.py
+++ b/rsconcept/backend/apps/rsform/tests/s_models/t_Constituenta.py
@@ -23,7 +23,7 @@ class TestConstituenta(TestCase):
     def test_url(self):
         testStr = 'X1'
         cst = Constituenta.objects.create(alias=testStr, schema=self.schema1, order=1, convention='Test')
-        self.assertEqual(cst.get_absolute_url(), f'/api/constituents/{cst.id}')
+        self.assertEqual(cst.get_absolute_url(), f'/api/constituents/{cst.pk}')
 
 
     def test_order_not_null(self):
diff --git a/rsconcept/backend/apps/rsform/tests/s_models/t_Editor.py b/rsconcept/backend/apps/rsform/tests/s_models/t_Editor.py
index e02ffae8..1f25ad4d 100644
--- a/rsconcept/backend/apps/rsform/tests/s_models/t_Editor.py
+++ b/rsconcept/backend/apps/rsform/tests/s_models/t_Editor.py
@@ -33,14 +33,14 @@ class TestEditor(TestCase):
 
 
     def test_add_editor(self):
-        self.assertTrue(Editor.add(self.user1, self.item))
+        self.assertTrue(Editor.add(self.item, self.user1))
         self.assertEqual(len(self.item.editors()), 1)
         self.assertTrue(self.user1 in self.item.editors())
 
-        self.assertFalse(Editor.add(self.user1, self.item))
+        self.assertFalse(Editor.add(self.item, self.user1))
         self.assertEqual(len(self.item.editors()), 1)
 
-        self.assertTrue(Editor.add(self.user2, self.item))
+        self.assertTrue(Editor.add(self.item, self.user2))
         self.assertEqual(len(self.item.editors()), 2)
         self.assertTrue(self.user1 in self.item.editors())
         self.assertTrue(self.user2 in self.item.editors())
@@ -50,13 +50,27 @@ class TestEditor(TestCase):
 
 
     def test_remove_editor(self):
-        self.assertFalse(Editor.remove(self.user1, self.item))
-        Editor.add(self.user1, self.item)
-        Editor.add(self.user2, self.item)
+        self.assertFalse(Editor.remove(self.item, self.user1))
+        Editor.add(self.item, self.user1)
+        Editor.add(self.item, self.user2)
         self.assertEqual(len(self.item.editors()), 2)
 
-        self.assertTrue(Editor.remove(self.user1, self.item))
+        self.assertTrue(Editor.remove(self.item, self.user1))
         self.assertEqual(len(self.item.editors()), 1)
         self.assertTrue(self.user2 in self.item.editors())
 
-        self.assertFalse(Editor.remove(self.user1, self.item))
+        self.assertFalse(Editor.remove(self.item, self.user1))
+
+
+    def test_set_editors(self):
+        Editor.set(self.item, [self.user1])
+        self.assertEqual(self.item.editors(), [self.user1])
+
+        Editor.set(self.item, [self.user1, self.user1])
+        self.assertEqual(self.item.editors(), [self.user1])
+
+        Editor.set(self.item, [])
+        self.assertEqual(self.item.editors(), [])
+
+        Editor.set(self.item, [self.user1, self.user2])
+        self.assertEqual(set(self.item.editors()), set([self.user1, self.user2]))
diff --git a/rsconcept/backend/apps/rsform/tests/s_models/t_LibraryItem.py b/rsconcept/backend/apps/rsform/tests/s_models/t_LibraryItem.py
index 8b35e29d..997d4eb0 100644
--- a/rsconcept/backend/apps/rsform/tests/s_models/t_LibraryItem.py
+++ b/rsconcept/backend/apps/rsform/tests/s_models/t_LibraryItem.py
@@ -31,7 +31,7 @@ class TestLibraryItem(TestCase):
             owner=self.user1,
             alias='КС1'
         )
-        self.assertEqual(item.get_absolute_url(), f'/api/library/{item.id}')
+        self.assertEqual(item.get_absolute_url(), f'/api/library/{item.pk}')
 
 
     def test_create_default(self):
diff --git a/rsconcept/backend/apps/rsform/tests/s_models/t_RSForm.py b/rsconcept/backend/apps/rsform/tests/s_models/t_RSForm.py
index c7cc2fff..7881f2b9 100644
--- a/rsconcept/backend/apps/rsform/tests/s_models/t_RSForm.py
+++ b/rsconcept/backend/apps/rsform/tests/s_models/t_RSForm.py
@@ -350,7 +350,7 @@ class TestRSForm(TestCase):
         x1.term_resolved = 'слон'
         x1.save()
 
-        self.schema.on_term_change([x1.id])
+        self.schema.on_term_change([x1.pk])
         x1.refresh_from_db()
         x2.refresh_from_db()
         x3.refresh_from_db()
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/EndpointTester.py b/rsconcept/backend/apps/rsform/tests/s_views/EndpointTester.py
index 2608b2af..0c4e705f 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/EndpointTester.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/EndpointTester.py
@@ -1,6 +1,6 @@
 ''' Utils: base tester class for endpoints. '''
-from rest_framework.test import APITestCase, APIRequestFactory, APIClient
 from rest_framework import status
+from rest_framework.test import APIClient, APIRequestFactory, APITestCase
 
 from apps.users.models import User
 
@@ -23,6 +23,7 @@ def decl_endpoint(endpoint: str, method: str):
 
 class EndpointTester(APITestCase):
     ''' Abstract base class for Testing endpoints. '''
+
     def setUp(self):
         self.factory = APIRequestFactory()
         self.user = User.objects.create(username='UserTest')
@@ -129,15 +130,15 @@ def _resolve_url(url: str, **kwargs) -> str:
         pos_end = url.find('}', pos_start)
         if pos_end == -1:
             break
-        name = url[(pos_start + 1) : pos_end]
+        name = url[(pos_start + 1): pos_end]
         arg_names.add(name)
         if not name in kwargs:
             raise KeyError(f'Missing argument: {name} | Mask: {url}')
-        output += url[pos_input : pos_start]
+        output += url[pos_input: pos_start]
         output += str(kwargs[name])
         pos_input = pos_end + 1
     if pos_input < len(url):
-        output += url[pos_input : len(url)]
+        output += url[pos_input: len(url)]
     for (key, _) in kwargs.items():
         if key not in arg_names:
             raise KeyError(f'Unused argument: {name} | Mask: {url}')
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_cctext.py b/rsconcept/backend/apps/rsform/tests/s_views/t_cctext.py
index 99b88a55..76cef739 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_cctext.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_cctext.py
@@ -1,13 +1,13 @@
 ''' Testing views '''
+from cctext import split_grams
 from rest_framework import status
 
-from cctext import split_grams
-
-from .EndpointTester import decl_endpoint, EndpointTester
+from .EndpointTester import EndpointTester, decl_endpoint
 
 
 class TestNaturalLanguageViews(EndpointTester):
     ''' Test natural language endpoints. '''
+
     def _assert_tags(self, actual: str, expected: str):
         self.assertEqual(set(split_grams(actual)), set(split_grams(expected)))
 
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_constituents.py b/rsconcept/backend/apps/rsform/tests/s_views/t_constituents.py
index ea6000d5..098d2741 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_constituents.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_constituents.py
@@ -1,13 +1,14 @@
 ''' Testing API: Constituents. '''
 from rest_framework import status
 
-from apps.rsform.models import RSForm, Constituenta, CstType
+from apps.rsform.models import Constituenta, CstType, RSForm
 
-from .EndpointTester import decl_endpoint, EndpointTester
+from .EndpointTester import EndpointTester, decl_endpoint
 
 
 class TestConstituentaAPI(EndpointTester):
     ''' Testing Constituenta view. '''
+
     def setUp(self):
         super().setUp()
         self.rsform_owned = RSForm.create(title='Test', alias='T1', owner=self.user)
@@ -20,7 +21,7 @@ class TestConstituentaAPI(EndpointTester):
             convention='Test',
             term_raw='Test1',
             term_resolved='Test1R',
-            term_forms=[{'text':'form1', 'tags':'sing,datv'}])
+            term_forms=[{'text': 'form1', 'tags': 'sing,datv'}])
         self.cst2 = Constituenta.objects.create(
             alias='X2',
             cst_type=CstType.BASE,
@@ -45,7 +46,7 @@ class TestConstituentaAPI(EndpointTester):
     @decl_endpoint('/api/constituents/{item}', method='get')
     def test_retrieve(self):
         self.assertNotFound(item=self.invalid_cst)
-        response = self.execute(item=self.cst1.id)
+        response = self.execute(item=self.cst1.pk)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['alias'], self.cst1.alias)
         self.assertEqual(response.data['convention'], self.cst1.convention)
@@ -54,19 +55,19 @@ class TestConstituentaAPI(EndpointTester):
     @decl_endpoint('/api/constituents/{item}', method='patch')
     def test_partial_update(self):
         data = {'convention': 'tt'}
-        self.assertForbidden(data, item=self.cst2.id)
+        self.assertForbidden(data, item=self.cst2.pk)
 
         self.logout()
-        self.assertForbidden(data, item=self.cst1.id)
+        self.assertForbidden(data, item=self.cst1.pk)
 
         self.login()
-        response = self.execute(data, item=self.cst1.id)
+        response = self.execute(data, item=self.cst1.pk)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.cst1.refresh_from_db()
         self.assertEqual(response.data['convention'], 'tt')
         self.assertEqual(self.cst1.convention, 'tt')
 
-        self.assertOK(data, item=self.cst1.id)
+        self.assertOK(data, item=self.cst1.pk)
 
 
     @decl_endpoint('/api/constituents/{item}', method='patch')
@@ -75,7 +76,7 @@ class TestConstituentaAPI(EndpointTester):
             'term_raw': 'New term',
             'definition_raw': 'New def'
         }
-        response = self.execute(data, item=self.cst3.id)
+        response = self.execute(data, item=self.cst3.pk)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.cst3.refresh_from_db()
         self.assertEqual(response.data['term_resolved'], 'New term')
@@ -90,7 +91,7 @@ class TestConstituentaAPI(EndpointTester):
             'term_raw': '@{X1|nomn,sing}',
             'definition_raw': '@{X1|nomn,sing} @{X1|sing,datv}'
         }
-        response = self.execute(data, item=self.cst3.id)
+        response = self.execute(data, item=self.cst3.pk)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.cst3.refresh_from_db()
         self.assertEqual(self.cst3.term_resolved, self.cst1.term_resolved)
@@ -102,7 +103,7 @@ class TestConstituentaAPI(EndpointTester):
     @decl_endpoint('/api/constituents/{item}', method='patch')
     def test_readonly_cst_fields(self):
         data = {'alias': 'X33', 'order': 10}
-        response = self.execute(data, item=self.cst1.id)
+        response = self.execute(data, item=self.cst1.pk)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['alias'], 'X1')
         self.assertEqual(response.data['alias'], self.cst1.alias)
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_library.py b/rsconcept/backend/apps/rsform/tests/s_views/t_library.py
index 5831409d..302cbdc3 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_library.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_library.py
@@ -1,7 +1,14 @@
 ''' Testing API: Library. '''
 from rest_framework import status
 
-from apps.rsform.models import LibraryItem, LibraryItemType, LibraryTemplate, RSForm, Subscription
+from apps.rsform.models import (
+    Editor,
+    LibraryItem,
+    LibraryItemType,
+    LibraryTemplate,
+    RSForm,
+    Subscription
+)
 from apps.users.models import User
 
 from ..testing_utils import response_contains
@@ -13,6 +20,7 @@ class TestLibraryViewset(EndpointTester):
 
     def setUp(self):
         super().setUp()
+        self.user2 = User.objects.create(username='UserTest2')
         self.owned = LibraryItem.objects.create(
             item_type=LibraryItemType.RSFORM,
             title='Test',
@@ -31,6 +39,7 @@ class TestLibraryViewset(EndpointTester):
             alias='T3',
             is_common=True
         )
+        self.invalid_user = 1337 + self.user2.pk
         self.invalid_item = 1337 + self.common.pk
 
 
@@ -40,7 +49,7 @@ class TestLibraryViewset(EndpointTester):
         response = self.post(data=data)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data['title'], 'Title')
-        self.assertEqual(response.data['owner'], self.user.id)
+        self.assertEqual(response.data['owner'], self.user.pk)
 
         self.logout()
         data = {'title': 'Title2'}
@@ -49,25 +58,132 @@ class TestLibraryViewset(EndpointTester):
 
     @decl_endpoint('/api/library/{item}', method='patch')
     def test_update(self):
-        data = {'id': self.unowned.id, 'title': 'New title'}
+        data = {'id': self.unowned.pk, 'title': 'New title'}
         self.assertNotFound(data, item=self.invalid_item)
-        self.assertForbidden(data, item=self.unowned.id)
+        self.assertForbidden(data, item=self.unowned.pk)
 
-        data = {'id': self.owned.id, 'title': 'New title'}
-        response = self.execute(data, item=self.owned.id)
+        data = {'id': self.owned.pk, 'title': 'New title'}
+        response = self.execute(data, item=self.owned.pk)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['title'], 'New title')
         self.assertEqual(response.data['alias'], self.owned.alias)
 
 
+    @decl_endpoint('/api/library/{item}/set-owner', method='patch')
+    def test_set_owner(self):
+        time_update = self.owned.time_update
+
+        data = {'user': self.user.pk}
+        self.assertNotFound(data, item=self.invalid_item)
+        self.assertForbidden(data, item=self.unowned.pk)
+        self.assertOK(data, item=self.owned.pk)
+        self.owned.refresh_from_db()
+        self.assertEqual(self.owned.owner, self.user)
+
+        data = {'user': self.user2.pk}
+        self.assertOK(data, item=self.owned.pk)
+        self.owned.refresh_from_db()
+        self.assertEqual(self.owned.owner, self.user2)
+        self.assertEqual(self.owned.time_update, time_update)
+        self.assertForbidden(data, item=self.owned.pk)
+
+        self.toggle_admin(True)
+        data = {'user': self.user.pk}
+        self.assertOK(data, item=self.owned.pk)
+        self.owned.refresh_from_db()
+        self.assertEqual(self.owned.owner, self.user)
+
+    @decl_endpoint('/api/library/{item}/editors-add', method='patch')
+    def test_add_editor(self):
+        time_update = self.owned.time_update
+
+        data = {'user': self.invalid_user}
+        self.assertBadData(data, item=self.owned.pk)
+
+        data = {'user': self.user.pk}
+        self.assertNotFound(data, item=self.invalid_item)
+        self.assertForbidden(data, item=self.unowned.pk)
+
+        self.assertOK(data, item=self.owned.pk)
+        self.owned.refresh_from_db()
+        self.assertEqual(self.owned.time_update, time_update)
+        self.assertEqual(self.owned.editors(), [self.user])
+
+        self.assertOK(data)
+        self.assertEqual(self.owned.editors(), [self.user])
+
+        data = {'user': self.user2.pk}
+        self.assertOK(data)
+        self.assertEqual(set(self.owned.editors()), set([self.user, self.user2]))
+
+
+    @decl_endpoint('/api/library/{item}/editors-remove', method='patch')
+    def test_remove_editor(self):
+        time_update = self.owned.time_update
+
+        data = {'user': self.invalid_user}
+        self.assertBadData(data, item=self.owned.pk)
+
+        data = {'user': self.user.pk}
+        self.assertNotFound(data, item=self.invalid_item)
+        self.assertForbidden(data, item=self.unowned.pk)
+
+        self.assertOK(data, item=self.owned.pk)
+        self.owned.refresh_from_db()
+        self.assertEqual(self.owned.time_update, time_update)
+        self.assertEqual(self.owned.editors(), [])
+
+        Editor.add(item=self.owned, user=self.user)
+        self.assertOK(data)
+        self.assertEqual(self.owned.editors(), [])
+
+        Editor.add(item=self.owned, user=self.user)
+        Editor.add(item=self.owned, user=self.user2)
+        data = {'user': self.user2.pk}
+        self.assertOK(data)
+        self.assertEqual(self.owned.editors(), [self.user])
+
+
+    @decl_endpoint('/api/library/{item}/editors-set', method='patch')
+    def test_set_editors(self):
+        time_update = self.owned.time_update
+
+        data = {'users': [self.invalid_user]}
+        self.assertBadData(data, item=self.owned.pk)
+
+        data = {'users': [self.user.pk]}
+        self.assertNotFound(data, item=self.invalid_item)
+        self.assertForbidden(data, item=self.unowned.pk)
+
+        self.assertOK(data, item=self.owned.pk)
+        self.owned.refresh_from_db()
+        self.assertEqual(self.owned.time_update, time_update)
+        self.assertEqual(self.owned.editors(), [self.user])
+
+        self.assertOK(data)
+        self.assertEqual(self.owned.editors(), [self.user])
+
+        data = {'users': [self.user2.pk]}
+        self.assertOK(data)
+        self.assertEqual(self.owned.editors(), [self.user2])
+
+        data = {'users': []}
+        self.assertOK(data)
+        self.assertEqual(self.owned.editors(), [])
+
+        data = {'users': [self.user2.pk, self.user.pk]}
+        self.assertOK(data)
+        self.assertEqual(set(self.owned.editors()), set([self.user2, self.user]))
+
+
     @decl_endpoint('/api/library/{item}', method='delete')
     def test_destroy(self):
-        response = self.execute(item=self.owned.id)
+        response = self.execute(item=self.owned.pk)
         self.assertTrue(response.status_code in [status.HTTP_202_ACCEPTED, status.HTTP_204_NO_CONTENT])
 
-        self.assertForbidden(item=self.unowned.id)
+        self.assertForbidden(item=self.unowned.pk)
         self.toggle_admin(True)
-        response = self.execute(item=self.unowned.id)
+        response = self.execute(item=self.unowned.pk)
         self.assertTrue(response.status_code in [status.HTTP_202_ACCEPTED, status.HTTP_204_NO_CONTENT])
 
 
@@ -108,10 +224,9 @@ class TestLibraryViewset(EndpointTester):
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertFalse(response_contains(response, self.unowned))
 
-        user2 = User.objects.create(username='UserTest2')
         Subscription.subscribe(user=self.user, item=self.unowned)
-        Subscription.subscribe(user=user2, item=self.unowned)
-        Subscription.subscribe(user=user2, item=self.owned)
+        Subscription.subscribe(user=self.user2, item=self.unowned)
+        Subscription.subscribe(user=self.user2, item=self.owned)
 
         response = self.execute()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
@@ -122,20 +237,20 @@ class TestLibraryViewset(EndpointTester):
     @decl_endpoint('/api/library/{item}/subscribe', method='post')
     def test_subscriptions(self):
         self.assertNotFound(item=self.invalid_item)
-        response = self.client.delete(f'/api/library/{self.unowned.id}/unsubscribe')
-        self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
+        response = self.client.delete(f'/api/library/{self.unowned.pk}/unsubscribe')
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertFalse(self.user in self.unowned.subscribers())
 
-        response = self.execute(item=self.unowned.id)
-        self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
+        response = self.execute(item=self.unowned.pk)
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertTrue(self.user in self.unowned.subscribers())
 
-        response = self.execute(item=self.unowned.id)
-        self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
+        response = self.execute(item=self.unowned.pk)
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertTrue(self.user in self.unowned.subscribers())
 
-        response = self.client.delete(f'/api/library/{self.unowned.id}/unsubscribe')
-        self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
+        response = self.client.delete(f'/api/library/{self.unowned.pk}/unsubscribe')
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertFalse(self.user in self.unowned.subscribers())
 
 
@@ -170,10 +285,10 @@ class TestLibraryViewset(EndpointTester):
 
         data = {'title': 'Title1337'}
         self.assertNotFound(data, item=self.invalid_item)
-        self.assertCreated(data, item=self.unowned.id)
+        self.assertCreated(data, item=self.unowned.pk)
 
         data = {'title': 'Title1338'}
-        response = self.execute(data, item=self.owned.id)
+        response = self.execute(data, item=self.owned.pk)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data['title'], data['title'])
         self.assertEqual(len(response.data['items']), 2)
@@ -184,13 +299,13 @@ class TestLibraryViewset(EndpointTester):
         self.assertEqual(response.data['items'][1]['term_resolved'], d2.term_resolved)
 
         data = {'title': 'Title1340', 'items': []}
-        response = self.execute(data, item=self.owned.id)
+        response = self.execute(data, item=self.owned.pk)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data['title'], data['title'])
         self.assertEqual(len(response.data['items']), 0)
 
         data = {'title': 'Title1341', 'items': [x12.pk]}
-        response = self.execute(data, item=self.owned.id)
+        response = self.execute(data, item=self.owned.pk)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data['title'], data['title'])
         self.assertEqual(len(response.data['items']), 1)
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_operations.py b/rsconcept/backend/apps/rsform/tests/s_views/t_operations.py
index 092c20cb..33faab82 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_operations.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_operations.py
@@ -1,12 +1,9 @@
 ''' Testing API: Operations. '''
 from rest_framework import status
-from .EndpointTester import decl_endpoint, EndpointTester
 
-from apps.rsform.models import (
-  RSForm,
-  Constituenta,
-  CstType
-)
+from apps.rsform.models import Constituenta, CstType, RSForm
+
+from .EndpointTester import EndpointTester, decl_endpoint
 
 
 class TestInlineSynthesis(EndpointTester):
@@ -24,8 +21,8 @@ class TestInlineSynthesis(EndpointTester):
     def test_inline_synthesis_inputs(self):
         invalid_id = 1338
         data = {
-            'receiver': self.unowned.item.id,
-            'source': self.schema1.item.id,
+            'receiver': self.unowned.item.pk,
+            'source': self.schema1.item.pk,
             'items': [],
             'substitutions': []
         }
@@ -34,11 +31,11 @@ class TestInlineSynthesis(EndpointTester):
         data['receiver'] = invalid_id
         self.assertBadData(data)
 
-        data['receiver'] = self.schema1.item.id
+        data['receiver'] = self.schema1.item.pk
         data['source'] = invalid_id
         self.assertBadData(data)
 
-        data['source'] = self.schema1.item.id
+        data['source'] = self.schema1.item.pk
         self.assertOK(data)
 
         data['items'] = [invalid_id]
@@ -46,28 +43,28 @@ class TestInlineSynthesis(EndpointTester):
 
 
     def test_inline_synthesis(self):
-        ks1_x1 = self.schema1.insert_new('X1', term_raw='KS1X1') # -> delete
-        ks1_x2 = self.schema1.insert_new('X2', term_raw='KS1X2') # -> X2
-        ks1_s1 = self.schema1.insert_new('S1', definition_formal='X2', term_raw='KS1S1') # -> S1
-        ks1_d1 = self.schema1.insert_new('D1', definition_formal=r'S1\X1\X2') # -> D1
-        ks2_x1 = self.schema2.insert_new('X1', term_raw='KS2X1') # -> delete
-        ks2_x2 = self.schema2.insert_new('X2', term_raw='KS2X2') # -> X4
-        ks2_s1 = self.schema2.insert_new('S1', definition_formal='X2×X2', term_raw='KS2S1') # -> S2
-        ks2_d1 = self.schema2.insert_new('D1', definition_formal=r'S1\X1\X2') # -> D2
-        ks2_a1 = self.schema2.insert_new('A1', definition_formal='1=1') # -> not included in items
+        ks1_x1 = self.schema1.insert_new('X1', term_raw='KS1X1')  # -> delete
+        ks1_x2 = self.schema1.insert_new('X2', term_raw='KS1X2')  # -> X2
+        ks1_s1 = self.schema1.insert_new('S1', definition_formal='X2', term_raw='KS1S1')  # -> S1
+        ks1_d1 = self.schema1.insert_new('D1', definition_formal=r'S1\X1\X2')  # -> D1
+        ks2_x1 = self.schema2.insert_new('X1', term_raw='KS2X1')  # -> delete
+        ks2_x2 = self.schema2.insert_new('X2', term_raw='KS2X2')  # -> X4
+        ks2_s1 = self.schema2.insert_new('S1', definition_formal='X2×X2', term_raw='KS2S1')  # -> S2
+        ks2_d1 = self.schema2.insert_new('D1', definition_formal=r'S1\X1\X2')  # -> D2
+        ks2_a1 = self.schema2.insert_new('A1', definition_formal='1=1')  # -> not included in items
 
         data = {
-            'receiver': self.schema1.item.id,
-            'source': self.schema2.item.id,
+            'receiver': self.schema1.item.pk,
+            'source': self.schema2.item.pk,
             'items': [ks2_x1.pk, ks2_x2.pk, ks2_s1.pk, ks2_d1.pk],
             'substitutions': [
                 {
-                    'original': ks1_x1.pk, 
+                    'original': ks1_x1.pk,
                     'substitution': ks2_s1.pk,
                     'transfer_term': False
                 },
                 {
-                    'original': ks2_x1.pk, 
+                    'original': ks2_x1.pk,
                     'substitution': ks1_s1.pk,
                     'transfer_term': True
                 }
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_rsforms.py b/rsconcept/backend/apps/rsform/tests/s_views/t_rsforms.py
index 93696aa2..e0a10b16 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_rsforms.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_rsforms.py
@@ -1,31 +1,26 @@
 ''' Testing API: RSForms. '''
-import os
 import io
+import os
 from zipfile import ZipFile
-from rest_framework import status
-
-from apps.rsform.models import (
-  RSForm,
-  Constituenta,
-  CstType,
-  LibraryItem,
-  LibraryItemType
-)
 
 from cctext import ReferenceType
-from ..testing_utils import response_contains
+from rest_framework import status
 
-from .EndpointTester import decl_endpoint, EndpointTester
+from apps.rsform.models import Constituenta, CstType, LibraryItem, LibraryItemType, RSForm
+
+from ..testing_utils import response_contains
+from .EndpointTester import EndpointTester, decl_endpoint
 
 
 class TestRSFormViewset(EndpointTester):
     ''' Testing RSForm view. '''
+
     def setUp(self):
         super().setUp()
         self.schema = RSForm.create(title='Test', alias='T1', owner=self.user)
-        self.schema_id = self.schema.item.id
+        self.schema_id = self.schema.item.pk
         self.unowned = RSForm.create(title='Test2', alias='T2')
-        self.unowned_id = self.unowned.item.id
+        self.unowned_id = self.unowned.item.pk
 
 
     @decl_endpoint('/api/rsforms/create-detailed', method='post')
@@ -75,7 +70,7 @@ class TestRSFormViewset(EndpointTester):
     def test_contents(self):
         schema = RSForm.create(title='Title1')
         schema.insert_new('X1')
-        self.assertOK(item=schema.item.id)
+        self.assertOK(item=schema.item.pk)
 
 
     @decl_endpoint('/api/rsforms/{item}/details', method='get')
@@ -84,23 +79,23 @@ class TestRSFormViewset(EndpointTester):
         x1 = schema.insert_new(
             alias='X1',
             term_raw='человек',
-            term_resolved = 'человек'
+            term_resolved='человек'
         )
         x2 = schema.insert_new(
             alias='X2',
             term_raw='@{X1|plur}',
-            term_resolved = 'люди'
+            term_resolved='люди'
         )
 
-        response = self.execute(item=schema.item.id)
+        response = self.execute(item=schema.item.pk)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['title'], 'Test')
         self.assertEqual(len(response.data['items']), 2)
-        self.assertEqual(response.data['items'][0]['id'], x1.id)
+        self.assertEqual(response.data['items'][0]['id'], x1.pk)
         self.assertEqual(response.data['items'][0]['parse']['status'], 'verified')
         self.assertEqual(response.data['items'][0]['term_raw'], x1.term_raw)
         self.assertEqual(response.data['items'][0]['term_resolved'], x1.term_resolved)
-        self.assertEqual(response.data['items'][1]['id'], x2.id)
+        self.assertEqual(response.data['items'][1]['id'], x2.pk)
         self.assertEqual(response.data['items'][1]['term_raw'], x2.term_raw)
         self.assertEqual(response.data['items'][1]['term_resolved'], x2.term_resolved)
         self.assertEqual(response.data['subscribers'], [self.user.pk])
@@ -112,7 +107,7 @@ class TestRSFormViewset(EndpointTester):
         schema = RSForm.create(title='Test')
         schema.insert_new('X1')
         data = {'expression': 'X1=X1'}
-        response = self.execute(data, item=schema.item.id)
+        response = self.execute(data, item=schema.item.pk)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['parseResult'], True)
         self.assertEqual(response.data['syntax'], 'math')
@@ -132,7 +127,7 @@ class TestRSFormViewset(EndpointTester):
         )
 
         data = {'text': '@{1|редкий} @{X1|plur,datv}'}
-        response = self.execute(data, item=schema.item.id)
+        response = self.execute(data, item=schema.item.pk)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['input'], '@{1|редкий} @{X1|plur,datv}')
         self.assertEqual(response.data['output'], 'редким синим слонам')
@@ -170,7 +165,7 @@ class TestRSFormViewset(EndpointTester):
     def test_export_trs(self):
         schema = RSForm.create(title='Test')
         schema.insert_new('X1')
-        response = self.execute(item=schema.item.id)
+        response = self.execute(item=schema.item.pk)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.headers['Content-Disposition'], 'attachment; filename=Schema.trs')
         with io.BytesIO(response.content) as stream:
@@ -181,7 +176,7 @@ class TestRSFormViewset(EndpointTester):
 
     @decl_endpoint('/api/rsforms/{item}/cst-create', method='post')
     def test_create_constituenta(self):
-        data = {'alias': 'X3', 'cst_type':  CstType.BASE}
+        data = {'alias': 'X3', 'cst_type': CstType.BASE}
         self.assertForbidden(data, item=self.unowned_id)
 
         self.schema.insert_new('X1')
@@ -196,9 +191,9 @@ class TestRSFormViewset(EndpointTester):
         data = {
             'alias': 'X4',
             'cst_type': CstType.BASE,
-            'insert_after': x2.id,
+            'insert_after': x2.pk,
             'term_raw': 'test',
-            'term_forms': [{'text':'form1', 'tags':'sing,datv'}]
+            'term_forms': [{'text': 'form1', 'tags': 'sing,datv'}]
         }
         response = self.execute(data, item=self.schema_id)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
@@ -216,7 +211,7 @@ class TestRSFormViewset(EndpointTester):
             convention='Test',
             term_raw='Test1',
             term_resolved='Test1',
-            term_forms=[{'text':'form1', 'tags':'sing,datv'}]
+            term_forms=[{'text': 'form1', 'tags': 'sing,datv'}]
         )
         x2_2 = self.unowned.insert_new('X2')
         x3 = self.schema.insert_new(
@@ -226,7 +221,7 @@ class TestRSFormViewset(EndpointTester):
             definition_raw='Test1',
             definition_resolved='Test2'
         )
-        
+
         data = {'target': x2_2.pk, 'alias': 'D2', 'cst_type': CstType.TERM}
         self.assertForbidden(data, item=self.unowned_id)
         self.assertBadData(data, item=self.schema_id)
@@ -239,8 +234,8 @@ class TestRSFormViewset(EndpointTester):
 
         d1 = self.schema.insert_new(
             alias='D1',
-            term_raw = '@{X1|plur}',
-            definition_formal = 'X1'
+            term_raw='@{X1|plur}',
+            definition_formal='X1'
         )
         self.assertEqual(x1.order, 1)
         self.assertEqual(x1.alias, 'X1')
@@ -254,7 +249,7 @@ class TestRSFormViewset(EndpointTester):
         d1.refresh_from_db()
         x1.refresh_from_db()
         self.assertEqual(d1.term_resolved, '')
-        self.assertEqual(d1.term_raw,  '@{D2|plur}')
+        self.assertEqual(d1.term_raw, '@{D2|plur}')
         self.assertEqual(x1.order, 1)
         self.assertEqual(x1.alias, 'D2')
         self.assertEqual(x1.cst_type, CstType.TERM)
@@ -266,14 +261,14 @@ class TestRSFormViewset(EndpointTester):
             alias='X1',
             term_raw='Test1',
             term_resolved='Test1',
-            term_forms=[{'text':'form1', 'tags':'sing,datv'}]
+            term_forms=[{'text': 'form1', 'tags': 'sing,datv'}]
         )
         x2 = self.schema.insert_new(
             alias='X2',
             term_raw='Test2'
         )
         unowned = self.unowned.insert_new('X2')
-        
+
         data = {'substitutions': [{'original': x1.pk, 'substitution': unowned.pk, 'transfer_term': True}]}
         self.assertForbidden(data, item=self.unowned_id)
         self.assertBadData(data, item=self.schema_id)
@@ -310,10 +305,10 @@ class TestRSFormViewset(EndpointTester):
             alias='D3',
             definition_formal=r'X1 \ X2'
         )
-        
+
         data = {'substitutions': []}
         self.assertBadData(data)
-        
+
         data = {'substitutions': [
             {
                 'original': x1.pk,
@@ -379,7 +374,7 @@ class TestRSFormViewset(EndpointTester):
         x1 = self.schema.insert_new('X1')
         x2 = self.schema.insert_new('X2')
 
-        data = {'items': [x1.id]}
+        data = {'items': [x1.pk]}
         response = self.execute(data)
         x2.refresh_from_db()
         self.schema.item.refresh_from_db()
@@ -390,7 +385,7 @@ class TestRSFormViewset(EndpointTester):
         self.assertEqual(x2.order, 1)
 
         x3 = self.unowned.insert_new('X1')
-        data = {'items': [x3.id]}
+        data = {'items': [x3.pk]}
         self.assertBadData(data, item=self.schema_id)
 
 
@@ -404,7 +399,7 @@ class TestRSFormViewset(EndpointTester):
         x1 = self.schema.insert_new('X1')
         x2 = self.schema.insert_new('X2')
 
-        data = {'items': [x2.id], 'move_to': 1}
+        data = {'items': [x2.pk], 'move_to': 1}
         response = self.execute(data)
         x1.refresh_from_db()
         x2.refresh_from_db()
@@ -414,7 +409,7 @@ class TestRSFormViewset(EndpointTester):
         self.assertEqual(x2.order, 1)
 
         x3 = self.unowned.insert_new('X1')
-        data = {'items': [x3.id], 'move_to': 1}
+        data = {'items': [x3.pk], 'move_to': 1}
         self.assertBadData(data)
 
 
@@ -460,7 +455,7 @@ class TestRSFormViewset(EndpointTester):
         self.assertEqual(self.schema.item.title, 'Test11')
         self.assertEqual(len(response.data['items']), 25)
         self.assertEqual(self.schema.constituents().count(), 25)
-        self.assertFalse(Constituenta.objects.filter(pk=x1.id).exists())
+        self.assertFalse(Constituenta.objects.filter(pk=x1.pk).exists())
 
 
     @decl_endpoint('/api/rsforms/{item}/cst-produce-structure', method='patch')
@@ -490,11 +485,11 @@ class TestRSFormViewset(EndpointTester):
         invalid_id = f1.pk + 1337
 
         self.assertBadData({'target': invalid_id})
-        self.assertBadData({'target': x1.id})
-        self.assertBadData({'target': s2.id})
+        self.assertBadData({'target': x1.pk})
+        self.assertBadData({'target': s2.pk})
 
-        # Testing simple structure        
-        response = self.execute({'target': s1.id})
+        # Testing simple structure
+        response = self.execute({'target': s1.pk})
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         result = response.data['schema']
         items = [item for item in result['items'] if item['id'] in response.data['cst_list']]
@@ -506,7 +501,7 @@ class TestRSFormViewset(EndpointTester):
 
         # Testing complex structure
         s3.refresh_from_db()
-        response = self.execute({'target': s3.id})
+        response = self.execute({'target': s3.pk})
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         result = response.data['schema']
         items = [item for item in result['items'] if item['id'] in response.data['cst_list']]
@@ -516,7 +511,7 @@ class TestRSFormViewset(EndpointTester):
 
         # Testing function
         f1.refresh_from_db()
-        response = self.execute({'target': f1.id})
+        response = self.execute({'target': f1.pk})
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         result = response.data['schema']
         items = [item for item in result['items'] if item['id'] in response.data['cst_list']]
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_rslang.py b/rsconcept/backend/apps/rsform/tests/s_views/t_rslang.py
index 9e38ca1f..185586b2 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_rslang.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_rslang.py
@@ -1,8 +1,8 @@
 ''' Testing views '''
-from rest_framework.exceptions import ErrorDetail
 from rest_framework import status
+from rest_framework.exceptions import ErrorDetail
 
-from .EndpointTester import decl_endpoint, EndpointTester
+from .EndpointTester import EndpointTester, decl_endpoint
 
 
 class TestRSLanguageViews(EndpointTester):
@@ -42,4 +42,3 @@ class TestRSLanguageViews(EndpointTester):
         self.assertEqual(response.data['parseResult'], True)
         self.assertEqual(response.data['syntax'], 'math')
         self.assertEqual(response.data['astText'], '[=[1][1]]')
-
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_versions.py b/rsconcept/backend/apps/rsform/tests/s_views/t_versions.py
index e775ec1a..62fcef7a 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_versions.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_versions.py
@@ -1,17 +1,19 @@
 ''' Testing API: Versions. '''
 import io
-from typing import cast
 from sys import version
+from typing import cast
 from zipfile import ZipFile
+
 from rest_framework import status
 
-from apps.rsform.models import RSForm, Constituenta
+from apps.rsform.models import Constituenta, RSForm
 
-from .EndpointTester import decl_endpoint, EndpointTester
+from .EndpointTester import EndpointTester, decl_endpoint
 
 
 class TestVersionViews(EndpointTester):
     ''' Testing versioning endpoints. '''
+
     def setUp(self):
         super().setUp()
         self.owned = RSForm.create(title='Test', alias='T1', owner=self.user).item
@@ -30,10 +32,10 @@ class TestVersionViews(EndpointTester):
         data = {'version': '1.0.0', 'description': 'test'}
 
         self.assertNotFound(data, schema=invalid_id)
-        self.assertForbidden(data, schema=self.unowned.id)
-        self.assertBadData(invalid_data, schema=self.owned.id)
+        self.assertForbidden(data, schema=self.unowned.pk)
+        self.assertBadData(invalid_data, schema=self.owned.pk)
 
-        response = self.execute(data, schema=self.owned.id)
+        response = self.execute(data, schema=self.owned.pk)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertTrue('version' in response.data)
         self.assertTrue('schema' in response.data)
@@ -46,16 +48,16 @@ class TestVersionViews(EndpointTester):
         invalid_id = version_id + 1337
 
         self.assertNotFound(schema=invalid_id, version=invalid_id)
-        self.assertNotFound(schema=self.owned.id, version=invalid_id)
+        self.assertNotFound(schema=self.owned.pk, version=invalid_id)
         self.assertNotFound(schema=invalid_id, version=version_id)
-        self.assertNotFound(schema=self.unowned.id, version=version_id)
+        self.assertNotFound(schema=self.unowned.pk, version=version_id)
 
         self.owned.alias = 'NewName'
         self.owned.save()
         self.x1.alias = 'X33'
         self.x1.save()
-        
-        response = self.execute(schema=self.owned.id, version=version_id)
+
+        response = self.execute(schema=self.owned.pk, version=version_id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertNotEqual(response.data['alias'], self.owned.alias)
         self.assertNotEqual(response.data['items'][0]['alias'], self.x1.alias)
@@ -76,7 +78,7 @@ class TestVersionViews(EndpointTester):
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['version'], data['version'])
         self.assertEqual(response.data['description'], data['description'])
-        self.assertEqual(response.data['item'], self.owned.id)
+        self.assertEqual(response.data['item'], self.owned.pk)
 
         data = {'version': '1.2.0', 'description': 'test1'}
         self.method = 'patch'
@@ -111,7 +113,7 @@ class TestVersionViews(EndpointTester):
         a1.definition_formal = 'X1=X2'
         a1.save()
 
-        response = self.get(schema=self.owned.id, version=version_id)
+        response = self.get(schema=self.owned.pk, version=version_id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         loaded_a1 = response.data['items'][1]
         self.assertEqual(loaded_a1['definition_formal'], 'X1=X1')
@@ -171,8 +173,8 @@ class TestVersionViews(EndpointTester):
 
     def _create_version(self, data) -> int:
         response = self.client.post(
-            f'/api/rsforms/{self.owned.id}/versions/create',
+            f'/api/rsforms/{self.owned.pk}/versions/create',
             data=data, format='json'
         )
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
-        return response.data['version'] # type: ignore
+        return response.data['version']  # type: ignore
diff --git a/rsconcept/backend/apps/rsform/views/library.py b/rsconcept/backend/apps/rsform/views/library.py
index ee610040..3024d573 100644
--- a/rsconcept/backend/apps/rsform/views/library.py
+++ b/rsconcept/backend/apps/rsform/views/library.py
@@ -79,10 +79,13 @@ class LibraryViewSet(viewsets.ModelViewSet):
             return serializer.save()
 
     def get_permissions(self):
-        if self.action in ['destroy']:
-            permission_list = [permissions.ItemOwner]
-        elif self.action in ['update', 'partial_update']:
+        if self.action in ['update', 'partial_update']:
             permission_list = [permissions.ItemEditor]
+        elif self.action in [
+            'destroy', 'set_owner',
+            'editors_add', 'editors_remove', 'editors_set'
+        ]:
+            permission_list = [permissions.ItemOwner]
         elif self.action in ['create', 'clone', 'subscribe', 'unsubscribe']:
             permission_list = [permissions.GlobalUser]
         else:
@@ -139,7 +142,7 @@ class LibraryViewSet(viewsets.ModelViewSet):
         tags=['Library'],
         request=None,
         responses={
-            c.HTTP_204_NO_CONTENT: None,
+            c.HTTP_200_OK: None,
             c.HTTP_403_FORBIDDEN: None,
             c.HTTP_404_NOT_FOUND: None
         }
@@ -149,14 +152,14 @@ class LibraryViewSet(viewsets.ModelViewSet):
         ''' Endpoint: Subscribe current user to item. '''
         item = self._get_item()
         m.Subscription.subscribe(user=cast(m.User, self.request.user), item=item)
-        return Response(status=c.HTTP_204_NO_CONTENT)
+        return Response(status=c.HTTP_200_OK)
 
     @extend_schema(
         summary='unsubscribe from item',
         tags=['Library'],
         request=None,
         responses={
-            c.HTTP_204_NO_CONTENT: None,
+            c.HTTP_200_OK: None,
             c.HTTP_403_FORBIDDEN: None,
             c.HTTP_404_NOT_FOUND: None
         },
@@ -166,4 +169,84 @@ class LibraryViewSet(viewsets.ModelViewSet):
         ''' Endpoint: Unsubscribe current user from item. '''
         item = self._get_item()
         m.Subscription.unsubscribe(user=cast(m.User, self.request.user), item=item)
-        return Response(status=c.HTTP_204_NO_CONTENT)
+        return Response(status=c.HTTP_200_OK)
+
+    @extend_schema(
+        summary='set owner for item',
+        tags=['Library'],
+        request=s.UserTargetSerializer,
+        responses={
+            c.HTTP_200_OK: None,
+            c.HTTP_403_FORBIDDEN: None,
+            c.HTTP_404_NOT_FOUND: None
+        }
+    )
+    @action(detail=True, methods=['patch'], url_path='set-owner')
+    def set_owner(self, request: Request, pk):
+        ''' Endpoint: Set item owner. '''
+        item = self._get_item()
+        serializer = s.UserTargetSerializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+        new_owner = serializer.validated_data['user']
+        m.LibraryItem.objects.filter(pk=item.pk).update(owner=new_owner)
+        return Response(status=c.HTTP_200_OK)
+
+    @extend_schema(
+        summary='add editor for item',
+        tags=['Library'],
+        request=s.UserTargetSerializer,
+        responses={
+            c.HTTP_200_OK: None,
+            c.HTTP_403_FORBIDDEN: None,
+            c.HTTP_404_NOT_FOUND: None
+        }
+    )
+    @action(detail=True, methods=['patch'], url_path='editors-add')
+    def editors_add(self, request: Request, pk):
+        ''' Endpoint: Add editor for item. '''
+        item = self._get_item()
+        serializer = s.UserTargetSerializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+        new_editor = serializer.validated_data['user']
+        m.Editor.add(item=item, user=new_editor)
+        return Response(status=c.HTTP_200_OK)
+
+    @extend_schema(
+        summary='remove editor for item',
+        tags=['Library'],
+        request=s.UserTargetSerializer,
+        responses={
+            c.HTTP_200_OK: None,
+            c.HTTP_403_FORBIDDEN: None,
+            c.HTTP_404_NOT_FOUND: None
+        }
+    )
+    @action(detail=True, methods=['patch'], url_path='editors-remove')
+    def editors_remove(self, request: Request, pk):
+        ''' Endpoint: Remove editor for item. '''
+        item = self._get_item()
+        serializer = s.UserTargetSerializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+        editor = serializer.validated_data['user']
+        m.Editor.remove(item=item, user=editor)
+        return Response(status=c.HTTP_200_OK)
+
+    @extend_schema(
+        summary='set list of editors for item',
+        tags=['Library'],
+        request=s.UsersListSerializer,
+        responses={
+            c.HTTP_200_OK: None,
+            c.HTTP_403_FORBIDDEN: None,
+            c.HTTP_404_NOT_FOUND: None
+        }
+    )
+    @action(detail=True, methods=['patch'], url_path='editors-set')
+    def editors_set(self, request: Request, pk):
+        ''' Endpoint: Set list of editors for item. '''
+        item = self._get_item()
+        serializer = s.UsersListSerializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+        editors = serializer.validated_data['users']
+        m.Editor.set(item=item, users=editors)
+        return Response(status=c.HTTP_200_OK)
diff --git a/rsconcept/backend/apps/rsform/views/rsforms.py b/rsconcept/backend/apps/rsform/views/rsforms.py
index 4e8ffb33..8ae2baa6 100644
--- a/rsconcept/backend/apps/rsform/views/rsforms.py
+++ b/rsconcept/backend/apps/rsform/views/rsforms.py
@@ -32,8 +32,10 @@ class RSFormViewSet(viewsets.GenericViewSet, generics.ListAPIView, generics.Retr
 
     def get_permissions(self):
         ''' Determine permission class. '''
-        if self.action in ['load_trs', 'cst_create', 'cst_delete_multiple',
-                           'reset_aliases', 'cst_rename', 'cst_substitute']:
+        if self.action in [
+            'load_trs', 'cst_create', 'cst_delete_multiple',
+            'reset_aliases', 'cst_rename', 'cst_substitute'
+        ]:
             permission_list = [permissions.ItemOwner]
         else:
             permission_list = [permissions.Anyone]