refactor: inheritable authoring mixin callbacks for editing & duplica…

…tion (#33756)

cms/djangoapps/contentstore/views/block.py

@@ -13,6 +13,7 @@
 from opaque_keys.edx.keys import CourseKey
 from web_fragments.fragment import Fragment
 
+from cms.djangoapps.contentstore.utils import load_services_for_studio
 from cms.lib.xblock.authoring_mixin import VISIBILITY_VIEW
 from common.djangoapps.edxmako.shortcuts import render_to_string
 from common.djangoapps.student.auth import (
@@ -47,7 +48,6 @@
 from cms.djangoapps.contentstore.xblock_storage_handlers.view_handlers import (
     handle_xblock,
     create_xblock_info,
-    load_services_for_studio,
     get_block_info,
     get_xblock,
     delete_orphans,

cms/djangoapps/contentstore/views/preview.py

@@ -45,7 +45,7 @@
     wrap_xblock_aside
 )
 
-from ..utils import get_visibility_partition_info, StudioPermissionsService
+from ..utils import StudioPermissionsService, get_visibility_partition_info
 from .access import get_user_role
 from .session_kv_store import SessionKeyValueStore
 

cms/djangoapps/contentstore/xblock_storage_handlers/view_handlers.py

@@ -305,13 +305,10 @@ def _update_with_callback(xblock, user, old_metadata=None, old_content=None):
         old_metadata = own_metadata(xblock)
     if old_content is None:
         old_content = xblock.get_explicitly_set_fields_by_scope(Scope.content)
-    if hasattr(xblock, "editor_saved"):
-        load_services_for_studio(xblock.runtime, user)
-        xblock.editor_saved(user, old_metadata, old_content)
+    load_services_for_studio(xblock.runtime, user)
+    xblock.editor_saved(user, old_metadata, old_content)
     xblock_updated = modulestore().update_item(xblock, user.id)
-    if hasattr(xblock_updated, "post_editor_saved"):
-        load_services_for_studio(xblock_updated.runtime, user)
-        xblock_updated.post_editor_saved(user, old_metadata, old_content)
+    xblock_updated.post_editor_saved(user, old_metadata, old_content)
     return xblock_updated
 
 

cms/lib/xblock/authoring_mixin.py

@@ -10,6 +10,7 @@
 from xblock.core import XBlock, XBlockMixin
 from xblock.fields import String, Scope
 
+
 log = logging.getLogger(__name__)
 
 VISIBILITY_VIEW = 'visibility_view'
@@ -21,6 +22,7 @@ class AuthoringMixin(XBlockMixin):
     """
     Mixin class that provides authoring capabilities for XBlocks.
     """
+
     def _get_studio_resource_url(self, relative_url):
         """
         Returns the Studio URL to a static resource.
@@ -51,3 +53,17 @@ def visibility_view(self, _context=None):
         scope=Scope.settings,
         enforce_type=True,
     )
+
+    def editor_saved(self, user, old_metadata, old_content) -> None:  # pylint: disable=unused-argument
+        """
+        Called right *before* the block is written to the DB. Can be used, e.g., to modify fields before saving.
+
+        By default, is a no-op. Can be overriden in subclasses.
+        """
+
+    def post_editor_saved(self, user, old_metadata, old_content) -> None:  # pylint: disable=unused-argument
+        """
+        Called right *after* the block is written to the DB. Can be used, e.g., to spin up followup tasks.
+
+        By default, is a no-op. Can be overriden in subclasses.
+        """

xmodule/studio_editable.py

@@ -2,6 +2,7 @@
 Mixin to support editing in Studio.
 """
 from xblock.core import XBlock, XBlockMixin
+
 from xmodule.x_module import AUTHOR_VIEW, STUDENT_VIEW
 
 
@@ -12,6 +13,7 @@ class StudioEditableBlock(XBlockMixin):
 
     This class is only intended to be used with an XBlock!
     """
+
     has_author_view = True
 
     def render_children(self, context, fragment, can_reorder=False, can_add=False):
@@ -49,47 +51,6 @@ def get_preview_view_name(block):
         """
         return AUTHOR_VIEW if has_author_view(block) else STUDENT_VIEW
 
-    # Some parts of the code use getattr to dynamically check for the following methods on subclasses.
-    # We'd like to refactor so that we can actually declare them here as overridable methods.
-    # For now, we leave them here as documentation.
-    # See https://github.com/openedx/edx-platform/issues/33715.
-    #
-    # def editor_saved(self, old_metadata, old_content) -> None:  # pylint: disable=unused-argument
-    #     """
-    #     Called right *before* the block is written to the DB. Can be used, e.g., to modify fields before saving.
-    #
-    #     By default, is a no-op. Can be overriden in subclasses.
-    #     """
-    #
-    # def post_editor_saved(self, old_metadata, old_content) -> None:  # pylint: disable=unused-argument
-    #     """
-    #     Called right *after* the block is written to the DB. Can be used, e.g., to spin up followup tasks.
-    #
-    #     By default, is a no-op. Can be overriden in subclasses.
-    #     """
-    #
-    # def studio_post_duplicate(self, store, source_block) -> bool:  # pylint: disable=unused-argument
-    #     """
-    #     Called when a the block is duplicated. Can be used, e.g., for special handling of child duplication.
-    #
-    #     Returns 'True' if children have been handled and thus shouldn't be handled by the standard
-    #     duplication logic.
-    #
-    #     By default, is a no-op. Can be overriden in subclasses.
-    #     """
-    #     return False
-    #
-    # def studio_post_paste(self, store, source_node) -> bool:  # pylint: disable=unused-argument
-    #     """
-    #     Called after a block is copy-pasted. Can be used, e.g., for special handling of child duplication.
-    #
-    #     Returns 'True' if children have been handled and thus shouldn't be handled by the standard
-    #     duplication logic.
-    #
-    #     By default, is a no-op. Can be overriden in subclasses.
-    #     """
-    #     return False
-
 
 def has_author_view(block):
     """