feat: api to restore soft-deleted component [FC-0076] (openedx#35993)

Adds API to handle restoring soft-deleted library blocks.

openedx/core/djangoapps/content/search/documents.py

@@ -306,7 +306,10 @@ def _collections_for_content_object(object_id: UsageKey | LearningContextKey) ->
 
     If the object is in no collections, returns:
         {
-            "collections":  {},
+            "collections":  {
+                "display_name": [],
+                "key": [],
+            },
         }
 
     """

openedx/core/djangoapps/content/search/tests/test_handlers.py

@@ -185,3 +185,13 @@ def test_create_delete_library_block(self, meilisearch_client):
         meilisearch_client.return_value.index.return_value.delete_document.assert_called_with(
             "lborgalib_aproblemproblem1-ca3186e9"
         )
+
+        # Restore the Library Block
+        library_api.restore_library_block(problem.usage_key)
+        meilisearch_client.return_value.index.return_value.update_documents.assert_any_call([doc_problem])
+        meilisearch_client.return_value.index.return_value.update_documents.assert_any_call(
+            [{'id': doc_problem['id'], 'collections': {'display_name': [], 'key': []}}]
+        )
+        meilisearch_client.return_value.index.return_value.update_documents.assert_any_call(
+            [{'id': doc_problem['id'], 'tags': {}}]
+        )

openedx/core/djangoapps/content_libraries/api.py

@@ -1133,6 +1133,46 @@ def delete_library_block(usage_key, remove_from_parent=True):
         )
 
 
+def restore_library_block(usage_key):
+    """
+    Restore the specified library block.
+    """
+    component = get_component_from_usage_key(usage_key)
+    library_key = usage_key.context_key
+    affected_collections = authoring_api.get_entity_collections(component.learning_package_id, component.key)
+
+    # Set draft version back to the latest available component version id.
+    authoring_api.set_draft_version(component.pk, component.versioning.latest.pk)
+
+    LIBRARY_BLOCK_CREATED.send_event(
+        library_block=LibraryBlockData(
+            library_key=library_key,
+            usage_key=usage_key
+        )
+    )
+
+    # Add tags and collections back to index
+    CONTENT_OBJECT_ASSOCIATIONS_CHANGED.send_event(
+        content_object=ContentObjectChangedData(
+            object_id=str(usage_key),
+            changes=["collections", "tags"],
+        ),
+    )
+
+    # For each collection, trigger LIBRARY_COLLECTION_UPDATED signal and set background=True to trigger
+    # collection indexing asynchronously.
+    #
+    # To restore the component in the collections
+    for collection in affected_collections:
+        LIBRARY_COLLECTION_UPDATED.send_event(
+            library_collection=LibraryCollectionData(
+                library_key=library_key,
+                collection_key=collection.key,
+                background=True,
+            )
+        )
+
+
 def get_library_block_static_asset_files(usage_key) -> list[LibraryXBlockStaticFile]:
     """
     Given an XBlock in a content library, list all the static asset files

openedx/core/djangoapps/content_libraries/tests/test_api.py

@@ -591,6 +591,35 @@ def test_delete_library_block(self):
             event_receiver.call_args_list[0].kwargs,
         )
 
+    def test_restore_library_block(self):
+        api.update_library_collection_components(
+            self.lib1.library_key,
+            self.col1.key,
+            usage_keys=[
+                UsageKey.from_string(self.lib1_problem_block["id"]),
+                UsageKey.from_string(self.lib1_html_block["id"]),
+            ],
+        )
+
+        event_receiver = mock.Mock()
+        LIBRARY_COLLECTION_UPDATED.connect(event_receiver)
+
+        api.restore_library_block(UsageKey.from_string(self.lib1_problem_block["id"]))
+
+        assert event_receiver.call_count == 1
+        self.assertDictContainsSubset(
+            {
+                "signal": LIBRARY_COLLECTION_UPDATED,
+                "sender": None,
+                "library_collection": LibraryCollectionData(
+                    self.lib1.library_key,
+                    collection_key=self.col1.key,
+                    background=True,
+                ),
+            },
+            event_receiver.call_args_list[0].kwargs,
+        )
+
     def test_add_component_and_revert(self):
         # Add component and publish
         api.update_library_collection_components(

openedx/core/djangoapps/content_libraries/urls.py

@@ -57,6 +57,7 @@
         path('blocks/<str:usage_key_str>/', include([
             # Get metadata about a specific XBlock in this library, or delete the block:
             path('', views.LibraryBlockView.as_view()),
+            path('restore/', views.LibraryBlockRestore.as_view()),
             # Update collections for a given component
             path('collections/', views.LibraryBlockCollectionsView.as_view(), name='update-collections'),
             # Get the LTI URL of a specific XBlock

openedx/core/djangoapps/content_libraries/views.py

@@ -644,6 +644,22 @@ def delete(self, request, usage_key_str):  # pylint: disable=unused-argument
         return Response({})
 
 
+@view_auth_classes()
+class LibraryBlockRestore(APIView):
+    """
+    View to restore soft-deleted library xblocks.
+    """
+    @convert_exceptions
+    def post(self, request, usage_key_str) -> Response:
+        """
+        Restores a soft-deleted library block that belongs to a Content Library
+        """
+        key = LibraryUsageLocatorV2.from_string(usage_key_str)
+        api.require_permission_for_library_key(key.lib_key, request.user, permissions.CAN_EDIT_THIS_CONTENT_LIBRARY)
+        api.restore_library_block(key)
+        return Response(None, status=status.HTTP_204_NO_CONTENT)
+
+
 @method_decorator(non_atomic_requests, name="dispatch")
 @view_auth_classes()
 class LibraryBlockCollectionsView(APIView):

openedx/core/djangoapps/content_tagging/handlers.py

@@ -20,7 +20,6 @@
     XBLOCK_DUPLICATED,
     LIBRARY_BLOCK_CREATED,
     LIBRARY_BLOCK_UPDATED,
-    LIBRARY_BLOCK_DELETED,
 )
 
 from .api import copy_object_tags
@@ -30,7 +29,6 @@
     update_course_tags,
     update_xblock_tags,
     update_library_block_tags,
-    delete_library_block_tags,
 )
 from .toggles import CONTENT_TAGGING_AUTO
 
@@ -119,22 +117,6 @@ def auto_tag_library_block(**kwargs):
     )
 
 
-@receiver(LIBRARY_BLOCK_DELETED)
-def delete_tag_library_block(**kwargs):
-    """
-    Delete tags associated with a Library XBlock whenever the block is deleted.
-    """
-    library_block_data = kwargs.get("library_block", None)
-    if not library_block_data or not isinstance(library_block_data, LibraryBlockData):
-        log.error("Received null or incorrect data for event")
-        return
-
-    try:
-        delete_library_block_tags(str(library_block_data.usage_key))
-    except Exception as err:  # pylint: disable=broad-except
-        log.error(f"Failed to delete library block tags: {err}")
-
-
 @receiver(XBLOCK_DUPLICATED)
 def duplicate_tags(**kwargs):
     """

openedx/core/djangoapps/content_tagging/tests/test_tasks.py

@@ -14,7 +14,9 @@
 from common.djangoapps.student.tests.factories import UserFactory
 from openedx.core.djangolib.testing.utils import skip_unless_cms
 from xmodule.modulestore.tests.django_utils import TEST_DATA_SPLIT_MODULESTORE, ModuleStoreTestCase
-from openedx.core.djangoapps.content_libraries.api import create_library, create_library_block, delete_library_block
+from openedx.core.djangoapps.content_libraries.api import (
+    create_library, create_library_block, delete_library_block, restore_library_block
+)
 
 from .. import api
 from ..models.base import TaxonomyOrg
@@ -267,7 +269,7 @@ def test_waffle_disabled_create_delete_xblock(self):
         # Still no tags
         assert self._check_tag(usage_key_str, LANGUAGE_TAXONOMY_ID, None)
 
-    def test_create_delete_library_block(self):
+    def test_create_delete_restore_library_block(self):
         # Create library
         library = create_library(
             org=self.orgA,
@@ -287,11 +289,17 @@ def test_create_delete_library_block(self):
         # Check if the tags are created in the Library Block with the user's preferred language
         assert self._check_tag(usage_key_str, LANGUAGE_TAXONOMY_ID, 'Português (Brasil)')
 
-        # Delete the XBlock
+        # Soft delete the XBlock
         delete_library_block(library_block.usage_key)
 
-        # Check if the tags are deleted
-        assert self._check_tag(usage_key_str, LANGUAGE_TAXONOMY_ID, None)
+        # Check that the tags are not deleted
+        assert self._check_tag(usage_key_str, LANGUAGE_TAXONOMY_ID, 'Português (Brasil)')
+
+        # Restore the XBlock
+        restore_library_block(library_block.usage_key)
+
+        # Check if the tags are still present in the Library Block with the user's preferred language
+        assert self._check_tag(usage_key_str, LANGUAGE_TAXONOMY_ID, 'Português (Brasil)')
 
     @override_waffle_flag(CONTENT_TAGGING_AUTO, active=False)
     def test_waffle_disabled_create_delete_library_block(self):
@@ -319,3 +327,10 @@ def test_waffle_disabled_create_delete_library_block(self):
 
         # Still no tags
         assert self._check_tag(usage_key_str, LANGUAGE_TAXONOMY_ID, None)
+
+        # Restore the XBlock
+        with patch('crum.get_current_request', return_value=fake_request):
+            restore_library_block(library_block.usage_key)
+
+        # Still no tags
+        assert self._check_tag(usage_key_str, LANGUAGE_TAXONOMY_ID, None)